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gcc/gcc/omp-low.c
Martin Jambor af16bc762a function.c (push_cfun): Check old current_function_decl matches old cfun... 
2012-09-20  Martin Jambor  <mjambor@suse.cz>

	* function.c (push_cfun): Check old current_function_decl matches
	old cfun, set new current_function_decl to the decl of the new
	cfun.
	(push_struct_function): Likewise.
	(pop_cfun): Likewise.
	(allocate_struct_function): Move call to
	invoke_set_current_function_hook to the end of the function.
	* cfgexpand.c (estimated_stack_frame_size): Do not set and restore
	current_function_decl.
	* cgraph.c (cgraph_release_function_body): Likewise.
	* cgraphunit.c (cgraph_process_new_functions): Likewise.
	(cgraph_add_new_function): Likewise.
	(cgraph_analyze_function): Likewise.
	(assemble_thunk): Set cfun to NULL at the end.
	(expand_function): Move call to set_cfun downwards.
	* gimple-low.c (record_vars_into): Only check current_function_decl
	before possibly doing push_cfun.
	* gimplify.c (gimplify_function_tree): Do not set and restore
	current_function_decl.
	* ipa-inline-analysis.c (compute_inline_parameters): Likewise.
	(inline_analyze_function): Likewise.
	* ipa-prop.c (ipa_analyze_node): Likewise.
	* ipa-pure-const.c (analyze_function): Likewise.
	* lto-streamer-in.c (lto_input_function_body): Do not set
	current_function_decl.
	* lto-streamer-out.c (output_function): Do not set and restore
	current_function_decl.
	* omp-low.c (finalize_task_copyfn): Likewise.
	(expand_omp_taskreg): Likewise.
	(create_task_copyfn): Likewise, move push_cfun up quite a bit.
	* passes.c (dump_passes): Do not set and restore current_function_decl.
	(do_per_function): Likewise.
	(do_per_function_toporder): Likewise.
	* trans-mem.c (ipa_tm_scan_irr_function): Likewise.
	(ipa_tm_transform_transaction): Likewise.
	(ipa_tm_transform_clone): Likewise.
	(ipa_tm_execute): Likewise.
	* tree-emutls.c (lower_emutls_function_body): Likewise.
	* tree-inline.c (initialize_cfun): Do not call pop_cfun.
	(tree_function_versioning): Do not call push_cfun, do not set and
	restore current_function_decl.  Remove assert checking consistency of
	cfun and current_function_decl.
	* tree-profile.c (tree_profiling): Do not set and restore
	current_function_decl.
	* tree-sra.c (convert_callers_for_node): Do not set
	current_function_decl.
	(convert_callers): Do not restore current_function_decl.
	(modify_function): Do not set current_function_decl.
	* tree-ssa-structalias.c (ipa_pta_execute): Do not set and restore
	current_function_decl.

fortran/
	* trans-decl.c (gfc_get_extern_function_decl): Push NULL cfun.  Do not
	set and restore current_function_decl.
	(gfc_init_coarray_decl): Do not set and restore current_function_decl.

lto/
	* lto.c (lto_materialize_function): Call push_struct_function and
	pop_cfun.

From-SVN: r191577
2012-09-20 18:35:40 +02:00

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/* Lowering pass for OpenMP directives. Converts OpenMP directives
into explicit calls to the runtime library (libgomp) and data
marshalling to implement data sharing and copying clauses.
Contributed by Diego Novillo <dnovillo@redhat.com>
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "gimple.h"
#include "tree-iterator.h"
#include "tree-inline.h"
#include "langhooks.h"
#include "diagnostic-core.h"
#include "tree-flow.h"
#include "flags.h"
#include "function.h"
#include "expr.h"
#include "tree-pass.h"
#include "ggc.h"
#include "except.h"
#include "splay-tree.h"
#include "optabs.h"
#include "cfgloop.h"
/* Lowering of OpenMP parallel and workshare constructs proceeds in two
phases. The first phase scans the function looking for OMP statements
and then for variables that must be replaced to satisfy data sharing
clauses. The second phase expands code for the constructs, as well as
re-gimplifying things when variables have been replaced with complex
expressions.
Final code generation is done by pass_expand_omp. The flowgraph is
scanned for parallel regions which are then moved to a new
function, to be invoked by the thread library. */
/* Context structure. Used to store information about each parallel
directive in the code. */
typedef struct omp_context
{
/* This field must be at the beginning, as we do "inheritance": Some
callback functions for tree-inline.c (e.g., omp_copy_decl)
receive a copy_body_data pointer that is up-casted to an
omp_context pointer. */
copy_body_data cb;
/* The tree of contexts corresponding to the encountered constructs. */
struct omp_context *outer;
gimple stmt;
/* Map variables to fields in a structure that allows communication
between sending and receiving threads. */
splay_tree field_map;
tree record_type;
tree sender_decl;
tree receiver_decl;
/* These are used just by task contexts, if task firstprivate fn is
needed. srecord_type is used to communicate from the thread
that encountered the task construct to task firstprivate fn,
record_type is allocated by GOMP_task, initialized by task firstprivate
fn and passed to the task body fn. */
splay_tree sfield_map;
tree srecord_type;
/* A chain of variables to add to the top-level block surrounding the
construct. In the case of a parallel, this is in the child function. */
tree block_vars;
/* What to do with variables with implicitly determined sharing
attributes. */
enum omp_clause_default_kind default_kind;
/* Nesting depth of this context. Used to beautify error messages re
invalid gotos. The outermost ctx is depth 1, with depth 0 being
reserved for the main body of the function. */
int depth;
/* True if this parallel directive is nested within another. */
bool is_nested;
} omp_context;
struct omp_for_data_loop
{
tree v, n1, n2, step;
enum tree_code cond_code;
};
/* A structure describing the main elements of a parallel loop. */
struct omp_for_data
{
struct omp_for_data_loop loop;
tree chunk_size;
gimple for_stmt;
tree pre, iter_type;
int collapse;
bool have_nowait, have_ordered;
enum omp_clause_schedule_kind sched_kind;
struct omp_for_data_loop *loops;
};
static splay_tree all_contexts;
static int taskreg_nesting_level;
struct omp_region *root_omp_region;
static bitmap task_shared_vars;
static void scan_omp (gimple_seq *, omp_context *);
static tree scan_omp_1_op (tree *, int *, void *);
#define WALK_SUBSTMTS \
case GIMPLE_BIND: \
case GIMPLE_TRY: \
case GIMPLE_CATCH: \
case GIMPLE_EH_FILTER: \
case GIMPLE_TRANSACTION: \
/* The sub-statements for these should be walked. */ \
*handled_ops_p = false; \
break;
/* Convenience function for calling scan_omp_1_op on tree operands. */
static inline tree
scan_omp_op (tree *tp, omp_context *ctx)
{
struct walk_stmt_info wi;
memset (&wi, 0, sizeof (wi));
wi.info = ctx;
wi.want_locations = true;
return walk_tree (tp, scan_omp_1_op, &wi, NULL);
}
static void lower_omp (gimple_seq *, omp_context *);
static tree lookup_decl_in_outer_ctx (tree, omp_context *);
static tree maybe_lookup_decl_in_outer_ctx (tree, omp_context *);
/* Find an OpenMP clause of type KIND within CLAUSES. */
tree
find_omp_clause (tree clauses, enum omp_clause_code kind)
{
for (; clauses ; clauses = OMP_CLAUSE_CHAIN (clauses))
if (OMP_CLAUSE_CODE (clauses) == kind)
return clauses;
return NULL_TREE;
}
/* Return true if CTX is for an omp parallel. */
static inline bool
is_parallel_ctx (omp_context *ctx)
{
return gimple_code (ctx->stmt) == GIMPLE_OMP_PARALLEL;
}
/* Return true if CTX is for an omp task. */
static inline bool
is_task_ctx (omp_context *ctx)
{
return gimple_code (ctx->stmt) == GIMPLE_OMP_TASK;
}
/* Return true if CTX is for an omp parallel or omp task. */
static inline bool
is_taskreg_ctx (omp_context *ctx)
{
return gimple_code (ctx->stmt) == GIMPLE_OMP_PARALLEL
|| gimple_code (ctx->stmt) == GIMPLE_OMP_TASK;
}
/* Return true if REGION is a combined parallel+workshare region. */
static inline bool
is_combined_parallel (struct omp_region *region)
{
return region->is_combined_parallel;
}
/* Extract the header elements of parallel loop FOR_STMT and store
them into *FD. */
static void
extract_omp_for_data (gimple for_stmt, struct omp_for_data *fd,
struct omp_for_data_loop *loops)
{
tree t, var, *collapse_iter, *collapse_count;
tree count = NULL_TREE, iter_type = long_integer_type_node;
struct omp_for_data_loop *loop;
int i;
struct omp_for_data_loop dummy_loop;
location_t loc = gimple_location (for_stmt);
fd->for_stmt = for_stmt;
fd->pre = NULL;
fd->collapse = gimple_omp_for_collapse (for_stmt);
if (fd->collapse > 1)
fd->loops = loops;
else
fd->loops = &fd->loop;
fd->have_nowait = fd->have_ordered = false;
fd->sched_kind = OMP_CLAUSE_SCHEDULE_STATIC;
fd->chunk_size = NULL_TREE;
collapse_iter = NULL;
collapse_count = NULL;
for (t = gimple_omp_for_clauses (for_stmt); t ; t = OMP_CLAUSE_CHAIN (t))
switch (OMP_CLAUSE_CODE (t))
{
case OMP_CLAUSE_NOWAIT:
fd->have_nowait = true;
break;
case OMP_CLAUSE_ORDERED:
fd->have_ordered = true;
break;
case OMP_CLAUSE_SCHEDULE:
fd->sched_kind = OMP_CLAUSE_SCHEDULE_KIND (t);
fd->chunk_size = OMP_CLAUSE_SCHEDULE_CHUNK_EXPR (t);
break;
case OMP_CLAUSE_COLLAPSE:
if (fd->collapse > 1)
{
collapse_iter = &OMP_CLAUSE_COLLAPSE_ITERVAR (t);
collapse_count = &OMP_CLAUSE_COLLAPSE_COUNT (t);
}
default:
break;
}
/* FIXME: for now map schedule(auto) to schedule(static).
There should be analysis to determine whether all iterations
are approximately the same amount of work (then schedule(static)
is best) or if it varies (then schedule(dynamic,N) is better). */
if (fd->sched_kind == OMP_CLAUSE_SCHEDULE_AUTO)
{
fd->sched_kind = OMP_CLAUSE_SCHEDULE_STATIC;
gcc_assert (fd->chunk_size == NULL);
}
gcc_assert (fd->collapse == 1 || collapse_iter != NULL);
if (fd->sched_kind == OMP_CLAUSE_SCHEDULE_RUNTIME)
gcc_assert (fd->chunk_size == NULL);
else if (fd->chunk_size == NULL)
{
/* We only need to compute a default chunk size for ordered
static loops and dynamic loops. */
if (fd->sched_kind != OMP_CLAUSE_SCHEDULE_STATIC
|| fd->have_ordered
|| fd->collapse > 1)
fd->chunk_size = (fd->sched_kind == OMP_CLAUSE_SCHEDULE_STATIC)
? integer_zero_node : integer_one_node;
}
for (i = 0; i < fd->collapse; i++)
{
if (fd->collapse == 1)
loop = &fd->loop;
else if (loops != NULL)
loop = loops + i;
else
loop = &dummy_loop;
loop->v = gimple_omp_for_index (for_stmt, i);
gcc_assert (SSA_VAR_P (loop->v));
gcc_assert (TREE_CODE (TREE_TYPE (loop->v)) == INTEGER_TYPE
|| TREE_CODE (TREE_TYPE (loop->v)) == POINTER_TYPE);
var = TREE_CODE (loop->v) == SSA_NAME ? SSA_NAME_VAR (loop->v) : loop->v;
loop->n1 = gimple_omp_for_initial (for_stmt, i);
loop->cond_code = gimple_omp_for_cond (for_stmt, i);
loop->n2 = gimple_omp_for_final (for_stmt, i);
switch (loop->cond_code)
{
case LT_EXPR:
case GT_EXPR:
break;
case LE_EXPR:
if (POINTER_TYPE_P (TREE_TYPE (loop->n2)))
loop->n2 = fold_build_pointer_plus_hwi_loc (loc, loop->n2, 1);
else
loop->n2 = fold_build2_loc (loc,
PLUS_EXPR, TREE_TYPE (loop->n2), loop->n2,
build_int_cst (TREE_TYPE (loop->n2), 1));
loop->cond_code = LT_EXPR;
break;
case GE_EXPR:
if (POINTER_TYPE_P (TREE_TYPE (loop->n2)))
loop->n2 = fold_build_pointer_plus_hwi_loc (loc, loop->n2, -1);
else
loop->n2 = fold_build2_loc (loc,
MINUS_EXPR, TREE_TYPE (loop->n2), loop->n2,
build_int_cst (TREE_TYPE (loop->n2), 1));
loop->cond_code = GT_EXPR;
break;
default:
gcc_unreachable ();
}
t = gimple_omp_for_incr (for_stmt, i);
gcc_assert (TREE_OPERAND (t, 0) == var);
switch (TREE_CODE (t))
{
case PLUS_EXPR:
loop->step = TREE_OPERAND (t, 1);
break;
case POINTER_PLUS_EXPR:
loop->step = fold_convert (ssizetype, TREE_OPERAND (t, 1));
break;
case MINUS_EXPR:
loop->step = TREE_OPERAND (t, 1);
loop->step = fold_build1_loc (loc,
NEGATE_EXPR, TREE_TYPE (loop->step),
loop->step);
break;
default:
gcc_unreachable ();
}
if (iter_type != long_long_unsigned_type_node)
{
if (POINTER_TYPE_P (TREE_TYPE (loop->v)))
iter_type = long_long_unsigned_type_node;
else if (TYPE_UNSIGNED (TREE_TYPE (loop->v))
&& TYPE_PRECISION (TREE_TYPE (loop->v))
>= TYPE_PRECISION (iter_type))
{
tree n;
if (loop->cond_code == LT_EXPR)
n = fold_build2_loc (loc,
PLUS_EXPR, TREE_TYPE (loop->v),
loop->n2, loop->step);
else
n = loop->n1;
if (TREE_CODE (n) != INTEGER_CST
|| tree_int_cst_lt (TYPE_MAX_VALUE (iter_type), n))
iter_type = long_long_unsigned_type_node;
}
else if (TYPE_PRECISION (TREE_TYPE (loop->v))
> TYPE_PRECISION (iter_type))
{
tree n1, n2;
if (loop->cond_code == LT_EXPR)
{
n1 = loop->n1;
n2 = fold_build2_loc (loc,
PLUS_EXPR, TREE_TYPE (loop->v),
loop->n2, loop->step);
}
else
{
n1 = fold_build2_loc (loc,
MINUS_EXPR, TREE_TYPE (loop->v),
loop->n2, loop->step);
n2 = loop->n1;
}
if (TREE_CODE (n1) != INTEGER_CST
|| TREE_CODE (n2) != INTEGER_CST
|| !tree_int_cst_lt (TYPE_MIN_VALUE (iter_type), n1)
|| !tree_int_cst_lt (n2, TYPE_MAX_VALUE (iter_type)))
iter_type = long_long_unsigned_type_node;
}
}
if (collapse_count && *collapse_count == NULL)
{
if ((i == 0 || count != NULL_TREE)
&& TREE_CODE (TREE_TYPE (loop->v)) == INTEGER_TYPE
&& TREE_CONSTANT (loop->n1)
&& TREE_CONSTANT (loop->n2)
&& TREE_CODE (loop->step) == INTEGER_CST)
{
tree itype = TREE_TYPE (loop->v);
if (POINTER_TYPE_P (itype))
itype = signed_type_for (itype);
t = build_int_cst (itype, (loop->cond_code == LT_EXPR ? -1 : 1));
t = fold_build2_loc (loc,
PLUS_EXPR, itype,
fold_convert_loc (loc, itype, loop->step), t);
t = fold_build2_loc (loc, PLUS_EXPR, itype, t,
fold_convert_loc (loc, itype, loop->n2));
t = fold_build2_loc (loc, MINUS_EXPR, itype, t,
fold_convert_loc (loc, itype, loop->n1));
if (TYPE_UNSIGNED (itype) && loop->cond_code == GT_EXPR)
t = fold_build2_loc (loc, TRUNC_DIV_EXPR, itype,
fold_build1_loc (loc, NEGATE_EXPR, itype, t),
fold_build1_loc (loc, NEGATE_EXPR, itype,
fold_convert_loc (loc, itype,
loop->step)));
else
t = fold_build2_loc (loc, TRUNC_DIV_EXPR, itype, t,
fold_convert_loc (loc, itype, loop->step));
t = fold_convert_loc (loc, long_long_unsigned_type_node, t);
if (count != NULL_TREE)
count = fold_build2_loc (loc,
MULT_EXPR, long_long_unsigned_type_node,
count, t);
else
count = t;
if (TREE_CODE (count) != INTEGER_CST)
count = NULL_TREE;
}
else
count = NULL_TREE;
}
}
if (count)
{
if (!tree_int_cst_lt (count, TYPE_MAX_VALUE (long_integer_type_node)))
iter_type = long_long_unsigned_type_node;
else
iter_type = long_integer_type_node;
}
else if (collapse_iter && *collapse_iter != NULL)
iter_type = TREE_TYPE (*collapse_iter);
fd->iter_type = iter_type;
if (collapse_iter && *collapse_iter == NULL)
*collapse_iter = create_tmp_var (iter_type, ".iter");
if (collapse_count && *collapse_count == NULL)
{
if (count)
*collapse_count = fold_convert_loc (loc, iter_type, count);
else
*collapse_count = create_tmp_var (iter_type, ".count");
}
if (fd->collapse > 1)
{
fd->loop.v = *collapse_iter;
fd->loop.n1 = build_int_cst (TREE_TYPE (fd->loop.v), 0);
fd->loop.n2 = *collapse_count;
fd->loop.step = build_int_cst (TREE_TYPE (fd->loop.v), 1);
fd->loop.cond_code = LT_EXPR;
}
}
/* Given two blocks PAR_ENTRY_BB and WS_ENTRY_BB such that WS_ENTRY_BB
is the immediate dominator of PAR_ENTRY_BB, return true if there
are no data dependencies that would prevent expanding the parallel
directive at PAR_ENTRY_BB as a combined parallel+workshare region.
When expanding a combined parallel+workshare region, the call to
the child function may need additional arguments in the case of
GIMPLE_OMP_FOR regions. In some cases, these arguments are
computed out of variables passed in from the parent to the child
via 'struct .omp_data_s'. For instance:
#pragma omp parallel for schedule (guided, i * 4)
for (j ...)
Is lowered into:
# BLOCK 2 (PAR_ENTRY_BB)
.omp_data_o.i = i;
#pragma omp parallel [child fn: bar.omp_fn.0 ( ..., D.1598)
# BLOCK 3 (WS_ENTRY_BB)
.omp_data_i = &.omp_data_o;
D.1667 = .omp_data_i->i;
D.1598 = D.1667 * 4;
#pragma omp for schedule (guided, D.1598)
When we outline the parallel region, the call to the child function
'bar.omp_fn.0' will need the value D.1598 in its argument list, but
that value is computed *after* the call site. So, in principle we
cannot do the transformation.
To see whether the code in WS_ENTRY_BB blocks the combined
parallel+workshare call, we collect all the variables used in the
GIMPLE_OMP_FOR header check whether they appear on the LHS of any
statement in WS_ENTRY_BB. If so, then we cannot emit the combined
call.
FIXME. If we had the SSA form built at this point, we could merely
hoist the code in block 3 into block 2 and be done with it. But at
this point we don't have dataflow information and though we could
hack something up here, it is really not worth the aggravation. */
static bool
workshare_safe_to_combine_p (basic_block ws_entry_bb)
{
struct omp_for_data fd;
gimple ws_stmt = last_stmt (ws_entry_bb);
if (gimple_code (ws_stmt) == GIMPLE_OMP_SECTIONS)
return true;
gcc_assert (gimple_code (ws_stmt) == GIMPLE_OMP_FOR);
extract_omp_for_data (ws_stmt, &fd, NULL);
if (fd.collapse > 1 && TREE_CODE (fd.loop.n2) != INTEGER_CST)
return false;
if (fd.iter_type != long_integer_type_node)
return false;
/* FIXME. We give up too easily here. If any of these arguments
are not constants, they will likely involve variables that have
been mapped into fields of .omp_data_s for sharing with the child
function. With appropriate data flow, it would be possible to
see through this. */
if (!is_gimple_min_invariant (fd.loop.n1)
|| !is_gimple_min_invariant (fd.loop.n2)
|| !is_gimple_min_invariant (fd.loop.step)
|| (fd.chunk_size && !is_gimple_min_invariant (fd.chunk_size)))
return false;
return true;
}
/* Collect additional arguments needed to emit a combined
parallel+workshare call. WS_STMT is the workshare directive being
expanded. */
static VEC(tree,gc) *
get_ws_args_for (gimple ws_stmt)
{
tree t;
location_t loc = gimple_location (ws_stmt);
VEC(tree,gc) *ws_args;
if (gimple_code (ws_stmt) == GIMPLE_OMP_FOR)
{
struct omp_for_data fd;
extract_omp_for_data (ws_stmt, &fd, NULL);
ws_args = VEC_alloc (tree, gc, 3 + (fd.chunk_size != 0));
t = fold_convert_loc (loc, long_integer_type_node, fd.loop.n1);
VEC_quick_push (tree, ws_args, t);
t = fold_convert_loc (loc, long_integer_type_node, fd.loop.n2);
VEC_quick_push (tree, ws_args, t);
t = fold_convert_loc (loc, long_integer_type_node, fd.loop.step);
VEC_quick_push (tree, ws_args, t);
if (fd.chunk_size)
{
t = fold_convert_loc (loc, long_integer_type_node, fd.chunk_size);
VEC_quick_push (tree, ws_args, t);
}
return ws_args;
}
else if (gimple_code (ws_stmt) == GIMPLE_OMP_SECTIONS)
{
/* Number of sections is equal to the number of edges from the
GIMPLE_OMP_SECTIONS_SWITCH statement, except for the one to
the exit of the sections region. */
basic_block bb = single_succ (gimple_bb (ws_stmt));
t = build_int_cst (unsigned_type_node, EDGE_COUNT (bb->succs) - 1);
ws_args = VEC_alloc (tree, gc, 1);
VEC_quick_push (tree, ws_args, t);
return ws_args;
}
gcc_unreachable ();
}
/* Discover whether REGION is a combined parallel+workshare region. */
static void
determine_parallel_type (struct omp_region *region)
{
basic_block par_entry_bb, par_exit_bb;
basic_block ws_entry_bb, ws_exit_bb;
if (region == NULL || region->inner == NULL
|| region->exit == NULL || region->inner->exit == NULL
|| region->inner->cont == NULL)
return;
/* We only support parallel+for and parallel+sections. */
if (region->type != GIMPLE_OMP_PARALLEL
|| (region->inner->type != GIMPLE_OMP_FOR
&& region->inner->type != GIMPLE_OMP_SECTIONS))
return;
/* Check for perfect nesting PAR_ENTRY_BB -> WS_ENTRY_BB and
WS_EXIT_BB -> PAR_EXIT_BB. */
par_entry_bb = region->entry;
par_exit_bb = region->exit;
ws_entry_bb = region->inner->entry;
ws_exit_bb = region->inner->exit;
if (single_succ (par_entry_bb) == ws_entry_bb
&& single_succ (ws_exit_bb) == par_exit_bb
&& workshare_safe_to_combine_p (ws_entry_bb)
&& (gimple_omp_parallel_combined_p (last_stmt (par_entry_bb))
|| (last_and_only_stmt (ws_entry_bb)
&& last_and_only_stmt (par_exit_bb))))
{
gimple ws_stmt = last_stmt (ws_entry_bb);
if (region->inner->type == GIMPLE_OMP_FOR)
{
/* If this is a combined parallel loop, we need to determine
whether or not to use the combined library calls. There
are two cases where we do not apply the transformation:
static loops and any kind of ordered loop. In the first
case, we already open code the loop so there is no need
to do anything else. In the latter case, the combined
parallel loop call would still need extra synchronization
to implement ordered semantics, so there would not be any
gain in using the combined call. */
tree clauses = gimple_omp_for_clauses (ws_stmt);
tree c = find_omp_clause (clauses, OMP_CLAUSE_SCHEDULE);
if (c == NULL
|| OMP_CLAUSE_SCHEDULE_KIND (c) == OMP_CLAUSE_SCHEDULE_STATIC
|| find_omp_clause (clauses, OMP_CLAUSE_ORDERED))
{
region->is_combined_parallel = false;
region->inner->is_combined_parallel = false;
return;
}
}
region->is_combined_parallel = true;
region->inner->is_combined_parallel = true;
region->ws_args = get_ws_args_for (ws_stmt);
}
}
/* Return true if EXPR is variable sized. */
static inline bool
is_variable_sized (const_tree expr)
{
return !TREE_CONSTANT (TYPE_SIZE_UNIT (TREE_TYPE (expr)));
}
/* Return true if DECL is a reference type. */
static inline bool
is_reference (tree decl)
{
return lang_hooks.decls.omp_privatize_by_reference (decl);
}
/* Lookup variables in the decl or field splay trees. The "maybe" form
allows for the variable form to not have been entered, otherwise we
assert that the variable must have been entered. */
static inline tree
lookup_decl (tree var, omp_context *ctx)
{
tree *n;
n = (tree *) pointer_map_contains (ctx->cb.decl_map, var);
return *n;
}
static inline tree
maybe_lookup_decl (const_tree var, omp_context *ctx)
{
tree *n;
n = (tree *) pointer_map_contains (ctx->cb.decl_map, var);
return n ? *n : NULL_TREE;
}
static inline tree
lookup_field (tree var, omp_context *ctx)
{
splay_tree_node n;
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) var);
return (tree) n->value;
}
static inline tree
lookup_sfield (tree var, omp_context *ctx)
{
splay_tree_node n;
n = splay_tree_lookup (ctx->sfield_map
? ctx->sfield_map : ctx->field_map,
(splay_tree_key) var);
return (tree) n->value;
}
static inline tree
maybe_lookup_field (tree var, omp_context *ctx)
{
splay_tree_node n;
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) var);
return n ? (tree) n->value : NULL_TREE;
}
/* Return true if DECL should be copied by pointer. SHARED_CTX is
the parallel context if DECL is to be shared. */
static bool
use_pointer_for_field (tree decl, omp_context *shared_ctx)
{
if (AGGREGATE_TYPE_P (TREE_TYPE (decl)))
return true;
/* We can only use copy-in/copy-out semantics for shared variables
when we know the value is not accessible from an outer scope. */
if (shared_ctx)
{
/* ??? Trivially accessible from anywhere. But why would we even
be passing an address in this case? Should we simply assert
this to be false, or should we have a cleanup pass that removes
these from the list of mappings? */
if (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
return true;
/* For variables with DECL_HAS_VALUE_EXPR_P set, we cannot tell
without analyzing the expression whether or not its location
is accessible to anyone else. In the case of nested parallel
regions it certainly may be. */
if (TREE_CODE (decl) != RESULT_DECL && DECL_HAS_VALUE_EXPR_P (decl))
return true;
/* Do not use copy-in/copy-out for variables that have their
address taken. */
if (TREE_ADDRESSABLE (decl))
return true;
/* Disallow copy-in/out in nested parallel if
decl is shared in outer parallel, otherwise
each thread could store the shared variable
in its own copy-in location, making the
variable no longer really shared. */
if (!TREE_READONLY (decl) && shared_ctx->is_nested)
{
omp_context *up;
for (up = shared_ctx->outer; up; up = up->outer)
if (is_taskreg_ctx (up) && maybe_lookup_decl (decl, up))
break;
if (up)
{
tree c;
for (c = gimple_omp_taskreg_clauses (up->stmt);
c; c = OMP_CLAUSE_CHAIN (c))
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_SHARED
&& OMP_CLAUSE_DECL (c) == decl)
break;
if (c)
goto maybe_mark_addressable_and_ret;
}
}
/* For tasks avoid using copy-in/out, unless they are readonly
(in which case just copy-in is used). As tasks can be
deferred or executed in different thread, when GOMP_task
returns, the task hasn't necessarily terminated. */
if (!TREE_READONLY (decl) && is_task_ctx (shared_ctx))
{
tree outer;
maybe_mark_addressable_and_ret:
outer = maybe_lookup_decl_in_outer_ctx (decl, shared_ctx);
if (is_gimple_reg (outer))
{
/* Taking address of OUTER in lower_send_shared_vars
might need regimplification of everything that uses the
variable. */
if (!task_shared_vars)
task_shared_vars = BITMAP_ALLOC (NULL);
bitmap_set_bit (task_shared_vars, DECL_UID (outer));
TREE_ADDRESSABLE (outer) = 1;
}
return true;
}
}
return false;
}
/* Create a new VAR_DECL and copy information from VAR to it. */
tree
copy_var_decl (tree var, tree name, tree type)
{
tree copy = build_decl (DECL_SOURCE_LOCATION (var), VAR_DECL, name, type);
TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (var);
TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (var);
DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (var);
DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (var);
DECL_IGNORED_P (copy) = DECL_IGNORED_P (var);
DECL_CONTEXT (copy) = DECL_CONTEXT (var);
TREE_USED (copy) = 1;
DECL_SEEN_IN_BIND_EXPR_P (copy) = 1;
return copy;
}
/* Construct a new automatic decl similar to VAR. */
static tree
omp_copy_decl_2 (tree var, tree name, tree type, omp_context *ctx)
{
tree copy = copy_var_decl (var, name, type);
DECL_CONTEXT (copy) = current_function_decl;
DECL_CHAIN (copy) = ctx->block_vars;
ctx->block_vars = copy;
return copy;
}
static tree
omp_copy_decl_1 (tree var, omp_context *ctx)
{
return omp_copy_decl_2 (var, DECL_NAME (var), TREE_TYPE (var), ctx);
}
/* Build COMPONENT_REF and set TREE_THIS_VOLATILE and TREE_READONLY on it
as appropriate. */
static tree
omp_build_component_ref (tree obj, tree field)
{
tree ret = build3 (COMPONENT_REF, TREE_TYPE (field), obj, field, NULL);
if (TREE_THIS_VOLATILE (field))
TREE_THIS_VOLATILE (ret) |= 1;
if (TREE_READONLY (field))
TREE_READONLY (ret) |= 1;
return ret;
}
/* Build tree nodes to access the field for VAR on the receiver side. */
static tree
build_receiver_ref (tree var, bool by_ref, omp_context *ctx)
{
tree x, field = lookup_field (var, ctx);
/* If the receiver record type was remapped in the child function,
remap the field into the new record type. */
x = maybe_lookup_field (field, ctx);
if (x != NULL)
field = x;
x = build_simple_mem_ref (ctx->receiver_decl);
x = omp_build_component_ref (x, field);
if (by_ref)
x = build_simple_mem_ref (x);
return x;
}
/* Build tree nodes to access VAR in the scope outer to CTX. In the case
of a parallel, this is a component reference; for workshare constructs
this is some variable. */
static tree
build_outer_var_ref (tree var, omp_context *ctx)
{
tree x;
if (is_global_var (maybe_lookup_decl_in_outer_ctx (var, ctx)))
x = var;
else if (is_variable_sized (var))
{
x = TREE_OPERAND (DECL_VALUE_EXPR (var), 0);
x = build_outer_var_ref (x, ctx);
x = build_simple_mem_ref (x);
}
else if (is_taskreg_ctx (ctx))
{
bool by_ref = use_pointer_for_field (var, NULL);
x = build_receiver_ref (var, by_ref, ctx);
}
else if (ctx->outer)
x = lookup_decl (var, ctx->outer);
else if (is_reference (var))
/* This can happen with orphaned constructs. If var is reference, it is
possible it is shared and as such valid. */
x = var;
else
gcc_unreachable ();
if (is_reference (var))
x = build_simple_mem_ref (x);
return x;
}
/* Build tree nodes to access the field for VAR on the sender side. */
static tree
build_sender_ref (tree var, omp_context *ctx)
{
tree field = lookup_sfield (var, ctx);
return omp_build_component_ref (ctx->sender_decl, field);
}
/* Add a new field for VAR inside the structure CTX->SENDER_DECL. */
static void
install_var_field (tree var, bool by_ref, int mask, omp_context *ctx)
{
tree field, type, sfield = NULL_TREE;
gcc_assert ((mask & 1) == 0
|| !splay_tree_lookup (ctx->field_map, (splay_tree_key) var));
gcc_assert ((mask & 2) == 0 || !ctx->sfield_map
|| !splay_tree_lookup (ctx->sfield_map, (splay_tree_key) var));
type = TREE_TYPE (var);
if (by_ref)
type = build_pointer_type (type);
else if ((mask & 3) == 1 && is_reference (var))
type = TREE_TYPE (type);
field = build_decl (DECL_SOURCE_LOCATION (var),
FIELD_DECL, DECL_NAME (var), type);
/* Remember what variable this field was created for. This does have a
side effect of making dwarf2out ignore this member, so for helpful
debugging we clear it later in delete_omp_context. */
DECL_ABSTRACT_ORIGIN (field) = var;
if (type == TREE_TYPE (var))
{
DECL_ALIGN (field) = DECL_ALIGN (var);
DECL_USER_ALIGN (field) = DECL_USER_ALIGN (var);
TREE_THIS_VOLATILE (field) = TREE_THIS_VOLATILE (var);
}
else
DECL_ALIGN (field) = TYPE_ALIGN (type);
if ((mask & 3) == 3)
{
insert_field_into_struct (ctx->record_type, field);
if (ctx->srecord_type)
{
sfield = build_decl (DECL_SOURCE_LOCATION (var),
FIELD_DECL, DECL_NAME (var), type);
DECL_ABSTRACT_ORIGIN (sfield) = var;
DECL_ALIGN (sfield) = DECL_ALIGN (field);
DECL_USER_ALIGN (sfield) = DECL_USER_ALIGN (field);
TREE_THIS_VOLATILE (sfield) = TREE_THIS_VOLATILE (field);
insert_field_into_struct (ctx->srecord_type, sfield);
}
}
else
{
if (ctx->srecord_type == NULL_TREE)
{
tree t;
ctx->srecord_type = lang_hooks.types.make_type (RECORD_TYPE);
ctx->sfield_map = splay_tree_new (splay_tree_compare_pointers, 0, 0);
for (t = TYPE_FIELDS (ctx->record_type); t ; t = TREE_CHAIN (t))
{
sfield = build_decl (DECL_SOURCE_LOCATION (var),
FIELD_DECL, DECL_NAME (t), TREE_TYPE (t));
DECL_ABSTRACT_ORIGIN (sfield) = DECL_ABSTRACT_ORIGIN (t);
insert_field_into_struct (ctx->srecord_type, sfield);
splay_tree_insert (ctx->sfield_map,
(splay_tree_key) DECL_ABSTRACT_ORIGIN (t),
(splay_tree_value) sfield);
}
}
sfield = field;
insert_field_into_struct ((mask & 1) ? ctx->record_type
: ctx->srecord_type, field);
}
if (mask & 1)
splay_tree_insert (ctx->field_map, (splay_tree_key) var,
(splay_tree_value) field);
if ((mask & 2) && ctx->sfield_map)
splay_tree_insert (ctx->sfield_map, (splay_tree_key) var,
(splay_tree_value) sfield);
}
static tree
install_var_local (tree var, omp_context *ctx)
{
tree new_var = omp_copy_decl_1 (var, ctx);
insert_decl_map (&ctx->cb, var, new_var);
return new_var;
}
/* Adjust the replacement for DECL in CTX for the new context. This means
copying the DECL_VALUE_EXPR, and fixing up the type. */
static void
fixup_remapped_decl (tree decl, omp_context *ctx, bool private_debug)
{
tree new_decl, size;
new_decl = lookup_decl (decl, ctx);
TREE_TYPE (new_decl) = remap_type (TREE_TYPE (decl), &ctx->cb);
if ((!TREE_CONSTANT (DECL_SIZE (new_decl)) || private_debug)
&& DECL_HAS_VALUE_EXPR_P (decl))
{
tree ve = DECL_VALUE_EXPR (decl);
walk_tree (&ve, copy_tree_body_r, &ctx->cb, NULL);
SET_DECL_VALUE_EXPR (new_decl, ve);
DECL_HAS_VALUE_EXPR_P (new_decl) = 1;
}
if (!TREE_CONSTANT (DECL_SIZE (new_decl)))
{
size = remap_decl (DECL_SIZE (decl), &ctx->cb);
if (size == error_mark_node)
size = TYPE_SIZE (TREE_TYPE (new_decl));
DECL_SIZE (new_decl) = size;
size = remap_decl (DECL_SIZE_UNIT (decl), &ctx->cb);
if (size == error_mark_node)
size = TYPE_SIZE_UNIT (TREE_TYPE (new_decl));
DECL_SIZE_UNIT (new_decl) = size;
}
}
/* The callback for remap_decl. Search all containing contexts for a
mapping of the variable; this avoids having to duplicate the splay
tree ahead of time. We know a mapping doesn't already exist in the
given context. Create new mappings to implement default semantics. */
static tree
omp_copy_decl (tree var, copy_body_data *cb)
{
omp_context *ctx = (omp_context *) cb;
tree new_var;
if (TREE_CODE (var) == LABEL_DECL)
{
new_var = create_artificial_label (DECL_SOURCE_LOCATION (var));
DECL_CONTEXT (new_var) = current_function_decl;
insert_decl_map (&ctx->cb, var, new_var);
return new_var;
}
while (!is_taskreg_ctx (ctx))
{
ctx = ctx->outer;
if (ctx == NULL)
return var;
new_var = maybe_lookup_decl (var, ctx);
if (new_var)
return new_var;
}
if (is_global_var (var) || decl_function_context (var) != ctx->cb.src_fn)
return var;
return error_mark_node;
}
/* Return the parallel region associated with STMT. */
/* Debugging dumps for parallel regions. */
void dump_omp_region (FILE *, struct omp_region *, int);
void debug_omp_region (struct omp_region *);
void debug_all_omp_regions (void);
/* Dump the parallel region tree rooted at REGION. */
void
dump_omp_region (FILE *file, struct omp_region *region, int indent)
{
fprintf (file, "%*sbb %d: %s\n", indent, "", region->entry->index,
gimple_code_name[region->type]);
if (region->inner)
dump_omp_region (file, region->inner, indent + 4);
if (region->cont)
{
fprintf (file, "%*sbb %d: GIMPLE_OMP_CONTINUE\n", indent, "",
region->cont->index);
}
if (region->exit)
fprintf (file, "%*sbb %d: GIMPLE_OMP_RETURN\n", indent, "",
region->exit->index);
else
fprintf (file, "%*s[no exit marker]\n", indent, "");
if (region->next)
dump_omp_region (file, region->next, indent);
}
DEBUG_FUNCTION void
debug_omp_region (struct omp_region *region)
{
dump_omp_region (stderr, region, 0);
}
DEBUG_FUNCTION void
debug_all_omp_regions (void)
{
dump_omp_region (stderr, root_omp_region, 0);
}
/* Create a new parallel region starting at STMT inside region PARENT. */
struct omp_region *
new_omp_region (basic_block bb, enum gimple_code type,
struct omp_region *parent)
{
struct omp_region *region = XCNEW (struct omp_region);
region->outer = parent;
region->entry = bb;
region->type = type;
if (parent)
{
/* This is a nested region. Add it to the list of inner
regions in PARENT. */
region->next = parent->inner;
parent->inner = region;
}
else
{
/* This is a toplevel region. Add it to the list of toplevel
regions in ROOT_OMP_REGION. */
region->next = root_omp_region;
root_omp_region = region;
}
return region;
}
/* Release the memory associated with the region tree rooted at REGION. */
static void
free_omp_region_1 (struct omp_region *region)
{
struct omp_region *i, *n;
for (i = region->inner; i ; i = n)
{
n = i->next;
free_omp_region_1 (i);
}
free (region);
}
/* Release the memory for the entire omp region tree. */
void
free_omp_regions (void)
{
struct omp_region *r, *n;
for (r = root_omp_region; r ; r = n)
{
n = r->next;
free_omp_region_1 (r);
}
root_omp_region = NULL;
}
/* Create a new context, with OUTER_CTX being the surrounding context. */
static omp_context *
new_omp_context (gimple stmt, omp_context *outer_ctx)
{
omp_context *ctx = XCNEW (omp_context);
splay_tree_insert (all_contexts, (splay_tree_key) stmt,
(splay_tree_value) ctx);
ctx->stmt = stmt;
if (outer_ctx)
{
ctx->outer = outer_ctx;
ctx->cb = outer_ctx->cb;
ctx->cb.block = NULL;
ctx->depth = outer_ctx->depth + 1;
}
else
{
ctx->cb.src_fn = current_function_decl;
ctx->cb.dst_fn = current_function_decl;
ctx->cb.src_node = cgraph_get_node (current_function_decl);
gcc_checking_assert (ctx->cb.src_node);
ctx->cb.dst_node = ctx->cb.src_node;
ctx->cb.src_cfun = cfun;
ctx->cb.copy_decl = omp_copy_decl;
ctx->cb.eh_lp_nr = 0;
ctx->cb.transform_call_graph_edges = CB_CGE_MOVE;
ctx->depth = 1;
}
ctx->cb.decl_map = pointer_map_create ();
return ctx;
}
static gimple_seq maybe_catch_exception (gimple_seq);
/* Finalize task copyfn. */
static void
finalize_task_copyfn (gimple task_stmt)
{
struct function *child_cfun;
tree child_fn;
gimple_seq seq = NULL, new_seq;
gimple bind;
child_fn = gimple_omp_task_copy_fn (task_stmt);
if (child_fn == NULL_TREE)
return;
child_cfun = DECL_STRUCT_FUNCTION (child_fn);
/* Inform the callgraph about the new function. */
DECL_STRUCT_FUNCTION (child_fn)->curr_properties
= cfun->curr_properties & ~PROP_loops;
push_cfun (child_cfun);
bind = gimplify_body (child_fn, false);
gimple_seq_add_stmt (&seq, bind);
new_seq = maybe_catch_exception (seq);
if (new_seq != seq)
{
bind = gimple_build_bind (NULL, new_seq, NULL);
seq = NULL;
gimple_seq_add_stmt (&seq, bind);
}
gimple_set_body (child_fn, seq);
pop_cfun ();
cgraph_add_new_function (child_fn, false);
}
/* Destroy a omp_context data structures. Called through the splay tree
value delete callback. */
static void
delete_omp_context (splay_tree_value value)
{
omp_context *ctx = (omp_context *) value;
pointer_map_destroy (ctx->cb.decl_map);
if (ctx->field_map)
splay_tree_delete (ctx->field_map);
if (ctx->sfield_map)
splay_tree_delete (ctx->sfield_map);
/* We hijacked DECL_ABSTRACT_ORIGIN earlier. We need to clear it before
it produces corrupt debug information. */
if (ctx->record_type)
{
tree t;
for (t = TYPE_FIELDS (ctx->record_type); t ; t = DECL_CHAIN (t))
DECL_ABSTRACT_ORIGIN (t) = NULL;
}
if (ctx->srecord_type)
{
tree t;
for (t = TYPE_FIELDS (ctx->srecord_type); t ; t = DECL_CHAIN (t))
DECL_ABSTRACT_ORIGIN (t) = NULL;
}
if (is_task_ctx (ctx))
finalize_task_copyfn (ctx->stmt);
XDELETE (ctx);
}
/* Fix up RECEIVER_DECL with a type that has been remapped to the child
context. */
static void
fixup_child_record_type (omp_context *ctx)
{
tree f, type = ctx->record_type;
/* ??? It isn't sufficient to just call remap_type here, because
variably_modified_type_p doesn't work the way we expect for
record types. Testing each field for whether it needs remapping
and creating a new record by hand works, however. */
for (f = TYPE_FIELDS (type); f ; f = DECL_CHAIN (f))
if (variably_modified_type_p (TREE_TYPE (f), ctx->cb.src_fn))
break;
if (f)
{
tree name, new_fields = NULL;
type = lang_hooks.types.make_type (RECORD_TYPE);
name = DECL_NAME (TYPE_NAME (ctx->record_type));
name = build_decl (DECL_SOURCE_LOCATION (ctx->receiver_decl),
TYPE_DECL, name, type);
TYPE_NAME (type) = name;
for (f = TYPE_FIELDS (ctx->record_type); f ; f = DECL_CHAIN (f))
{
tree new_f = copy_node (f);
DECL_CONTEXT (new_f) = type;
TREE_TYPE (new_f) = remap_type (TREE_TYPE (f), &ctx->cb);
DECL_CHAIN (new_f) = new_fields;
walk_tree (&DECL_SIZE (new_f), copy_tree_body_r, &ctx->cb, NULL);
walk_tree (&DECL_SIZE_UNIT (new_f), copy_tree_body_r,
&ctx->cb, NULL);
walk_tree (&DECL_FIELD_OFFSET (new_f), copy_tree_body_r,
&ctx->cb, NULL);
new_fields = new_f;
/* Arrange to be able to look up the receiver field
given the sender field. */
splay_tree_insert (ctx->field_map, (splay_tree_key) f,
(splay_tree_value) new_f);
}
TYPE_FIELDS (type) = nreverse (new_fields);
layout_type (type);
}
TREE_TYPE (ctx->receiver_decl) = build_pointer_type (type);
}
/* Instantiate decls as necessary in CTX to satisfy the data sharing
specified by CLAUSES. */
static void
scan_sharing_clauses (tree clauses, omp_context *ctx)
{
tree c, decl;
bool scan_array_reductions = false;
for (c = clauses; c; c = OMP_CLAUSE_CHAIN (c))
{
bool by_ref;
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_PRIVATE:
decl = OMP_CLAUSE_DECL (c);
if (OMP_CLAUSE_PRIVATE_OUTER_REF (c))
goto do_private;
else if (!is_variable_sized (decl))
install_var_local (decl, ctx);
break;
case OMP_CLAUSE_SHARED:
gcc_assert (is_taskreg_ctx (ctx));
decl = OMP_CLAUSE_DECL (c);
gcc_assert (!COMPLETE_TYPE_P (TREE_TYPE (decl))
|| !is_variable_sized (decl));
/* Global variables don't need to be copied,
the receiver side will use them directly. */
if (is_global_var (maybe_lookup_decl_in_outer_ctx (decl, ctx)))
break;
by_ref = use_pointer_for_field (decl, ctx);
if (! TREE_READONLY (decl)
|| TREE_ADDRESSABLE (decl)
|| by_ref
|| is_reference (decl))
{
install_var_field (decl, by_ref, 3, ctx);
install_var_local (decl, ctx);
break;
}
/* We don't need to copy const scalar vars back. */
OMP_CLAUSE_SET_CODE (c, OMP_CLAUSE_FIRSTPRIVATE);
goto do_private;
case OMP_CLAUSE_LASTPRIVATE:
/* Let the corresponding firstprivate clause create
the variable. */
if (OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c))
break;
/* FALLTHRU */
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_REDUCTION:
decl = OMP_CLAUSE_DECL (c);
do_private:
if (is_variable_sized (decl))
{
if (is_task_ctx (ctx))
install_var_field (decl, false, 1, ctx);
break;
}
else if (is_taskreg_ctx (ctx))
{
bool global
= is_global_var (maybe_lookup_decl_in_outer_ctx (decl, ctx));
by_ref = use_pointer_for_field (decl, NULL);
if (is_task_ctx (ctx)
&& (global || by_ref || is_reference (decl)))
{
install_var_field (decl, false, 1, ctx);
if (!global)
install_var_field (decl, by_ref, 2, ctx);
}
else if (!global)
install_var_field (decl, by_ref, 3, ctx);
}
install_var_local (decl, ctx);
break;
case OMP_CLAUSE_COPYPRIVATE:
case OMP_CLAUSE_COPYIN:
decl = OMP_CLAUSE_DECL (c);
by_ref = use_pointer_for_field (decl, NULL);
install_var_field (decl, by_ref, 3, ctx);
break;
case OMP_CLAUSE_DEFAULT:
ctx->default_kind = OMP_CLAUSE_DEFAULT_KIND (c);
break;
case OMP_CLAUSE_FINAL:
case OMP_CLAUSE_IF:
case OMP_CLAUSE_NUM_THREADS:
case OMP_CLAUSE_SCHEDULE:
if (ctx->outer)
scan_omp_op (&OMP_CLAUSE_OPERAND (c, 0), ctx->outer);
break;
case OMP_CLAUSE_NOWAIT:
case OMP_CLAUSE_ORDERED:
case OMP_CLAUSE_COLLAPSE:
case OMP_CLAUSE_UNTIED:
case OMP_CLAUSE_MERGEABLE:
break;
default:
gcc_unreachable ();
}
}
for (c = clauses; c; c = OMP_CLAUSE_CHAIN (c))
{
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_LASTPRIVATE:
/* Let the corresponding firstprivate clause create
the variable. */
if (OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c))
scan_array_reductions = true;
if (OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c))
break;
/* FALLTHRU */
case OMP_CLAUSE_PRIVATE:
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_REDUCTION:
decl = OMP_CLAUSE_DECL (c);
if (is_variable_sized (decl))
install_var_local (decl, ctx);
fixup_remapped_decl (decl, ctx,
OMP_CLAUSE_CODE (c) == OMP_CLAUSE_PRIVATE
&& OMP_CLAUSE_PRIVATE_DEBUG (c));
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION
&& OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
scan_array_reductions = true;
break;
case OMP_CLAUSE_SHARED:
decl = OMP_CLAUSE_DECL (c);
if (! is_global_var (maybe_lookup_decl_in_outer_ctx (decl, ctx)))
fixup_remapped_decl (decl, ctx, false);
break;
case OMP_CLAUSE_COPYPRIVATE:
case OMP_CLAUSE_COPYIN:
case OMP_CLAUSE_DEFAULT:
case OMP_CLAUSE_IF:
case OMP_CLAUSE_NUM_THREADS:
case OMP_CLAUSE_SCHEDULE:
case OMP_CLAUSE_NOWAIT:
case OMP_CLAUSE_ORDERED:
case OMP_CLAUSE_COLLAPSE:
case OMP_CLAUSE_UNTIED:
case OMP_CLAUSE_FINAL:
case OMP_CLAUSE_MERGEABLE:
break;
default:
gcc_unreachable ();
}
}
if (scan_array_reductions)
for (c = clauses; c; c = OMP_CLAUSE_CHAIN (c))
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION
&& OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
{
scan_omp (&OMP_CLAUSE_REDUCTION_GIMPLE_INIT (c), ctx);
scan_omp (&OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (c), ctx);
}
else if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_LASTPRIVATE
&& OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c))
scan_omp (&OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c), ctx);
}
/* Create a new name for omp child function. Returns an identifier. */
static GTY(()) unsigned int tmp_ompfn_id_num;
static tree
create_omp_child_function_name (bool task_copy)
{
return (clone_function_name (current_function_decl,
task_copy ? "_omp_cpyfn" : "_omp_fn"));
}
/* Build a decl for the omp child function. It'll not contain a body
yet, just the bare decl. */
static void
create_omp_child_function (omp_context *ctx, bool task_copy)
{
tree decl, type, name, t;
name = create_omp_child_function_name (task_copy);
if (task_copy)
type = build_function_type_list (void_type_node, ptr_type_node,
ptr_type_node, NULL_TREE);
else
type = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
decl = build_decl (gimple_location (ctx->stmt),
FUNCTION_DECL, name, type);
if (!task_copy)
ctx->cb.dst_fn = decl;
else
gimple_omp_task_set_copy_fn (ctx->stmt, decl);
TREE_STATIC (decl) = 1;
TREE_USED (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
DECL_NAMELESS (decl) = 1;
DECL_IGNORED_P (decl) = 0;
TREE_PUBLIC (decl) = 0;
DECL_UNINLINABLE (decl) = 1;
DECL_EXTERNAL (decl) = 0;
DECL_CONTEXT (decl) = NULL_TREE;
DECL_INITIAL (decl) = make_node (BLOCK);
t = build_decl (DECL_SOURCE_LOCATION (decl),
RESULT_DECL, NULL_TREE, void_type_node);
DECL_ARTIFICIAL (t) = 1;
DECL_IGNORED_P (t) = 1;
DECL_CONTEXT (t) = decl;
DECL_RESULT (decl) = t;
t = build_decl (DECL_SOURCE_LOCATION (decl),
PARM_DECL, get_identifier (".omp_data_i"), ptr_type_node);
DECL_ARTIFICIAL (t) = 1;
DECL_NAMELESS (t) = 1;
DECL_ARG_TYPE (t) = ptr_type_node;
DECL_CONTEXT (t) = current_function_decl;
TREE_USED (t) = 1;
DECL_ARGUMENTS (decl) = t;
if (!task_copy)
ctx->receiver_decl = t;
else
{
t = build_decl (DECL_SOURCE_LOCATION (decl),
PARM_DECL, get_identifier (".omp_data_o"),
ptr_type_node);
DECL_ARTIFICIAL (t) = 1;
DECL_NAMELESS (t) = 1;
DECL_ARG_TYPE (t) = ptr_type_node;
DECL_CONTEXT (t) = current_function_decl;
TREE_USED (t) = 1;
TREE_ADDRESSABLE (t) = 1;
DECL_CHAIN (t) = DECL_ARGUMENTS (decl);
DECL_ARGUMENTS (decl) = t;
}
/* Allocate memory for the function structure. The call to
allocate_struct_function clobbers CFUN, so we need to restore
it afterward. */
push_struct_function (decl);
cfun->function_end_locus = gimple_location (ctx->stmt);
pop_cfun ();
}
/* Scan an OpenMP parallel directive. */
static void
scan_omp_parallel (gimple_stmt_iterator *gsi, omp_context *outer_ctx)
{
omp_context *ctx;
tree name;
gimple stmt = gsi_stmt (*gsi);
/* Ignore parallel directives with empty bodies, unless there
are copyin clauses. */
if (optimize > 0
&& empty_body_p (gimple_omp_body (stmt))
&& find_omp_clause (gimple_omp_parallel_clauses (stmt),
OMP_CLAUSE_COPYIN) == NULL)
{
gsi_replace (gsi, gimple_build_nop (), false);
return;
}
ctx = new_omp_context (stmt, outer_ctx);
if (taskreg_nesting_level > 1)
ctx->is_nested = true;
ctx->field_map = splay_tree_new (splay_tree_compare_pointers, 0, 0);
ctx->default_kind = OMP_CLAUSE_DEFAULT_SHARED;
ctx->record_type = lang_hooks.types.make_type (RECORD_TYPE);
name = create_tmp_var_name (".omp_data_s");
name = build_decl (gimple_location (stmt),
TYPE_DECL, name, ctx->record_type);
DECL_ARTIFICIAL (name) = 1;
DECL_NAMELESS (name) = 1;
TYPE_NAME (ctx->record_type) = name;
create_omp_child_function (ctx, false);
gimple_omp_parallel_set_child_fn (stmt, ctx->cb.dst_fn);
scan_sharing_clauses (gimple_omp_parallel_clauses (stmt), ctx);
scan_omp (gimple_omp_body_ptr (stmt), ctx);
if (TYPE_FIELDS (ctx->record_type) == NULL)
ctx->record_type = ctx->receiver_decl = NULL;
else
{
layout_type (ctx->record_type);
fixup_child_record_type (ctx);
}
}
/* Scan an OpenMP task directive. */
static void
scan_omp_task (gimple_stmt_iterator *gsi, omp_context *outer_ctx)
{
omp_context *ctx;
tree name, t;
gimple stmt = gsi_stmt (*gsi);
location_t loc = gimple_location (stmt);
/* Ignore task directives with empty bodies. */
if (optimize > 0
&& empty_body_p (gimple_omp_body (stmt)))
{
gsi_replace (gsi, gimple_build_nop (), false);
return;
}
ctx = new_omp_context (stmt, outer_ctx);
if (taskreg_nesting_level > 1)
ctx->is_nested = true;
ctx->field_map = splay_tree_new (splay_tree_compare_pointers, 0, 0);
ctx->default_kind = OMP_CLAUSE_DEFAULT_SHARED;
ctx->record_type = lang_hooks.types.make_type (RECORD_TYPE);
name = create_tmp_var_name (".omp_data_s");
name = build_decl (gimple_location (stmt),
TYPE_DECL, name, ctx->record_type);
DECL_ARTIFICIAL (name) = 1;
DECL_NAMELESS (name) = 1;
TYPE_NAME (ctx->record_type) = name;
create_omp_child_function (ctx, false);
gimple_omp_task_set_child_fn (stmt, ctx->cb.dst_fn);
scan_sharing_clauses (gimple_omp_task_clauses (stmt), ctx);
if (ctx->srecord_type)
{
name = create_tmp_var_name (".omp_data_a");
name = build_decl (gimple_location (stmt),
TYPE_DECL, name, ctx->srecord_type);
DECL_ARTIFICIAL (name) = 1;
DECL_NAMELESS (name) = 1;
TYPE_NAME (ctx->srecord_type) = name;
create_omp_child_function (ctx, true);
}
scan_omp (gimple_omp_body_ptr (stmt), ctx);
if (TYPE_FIELDS (ctx->record_type) == NULL)
{
ctx->record_type = ctx->receiver_decl = NULL;
t = build_int_cst (long_integer_type_node, 0);
gimple_omp_task_set_arg_size (stmt, t);
t = build_int_cst (long_integer_type_node, 1);
gimple_omp_task_set_arg_align (stmt, t);
}
else
{
tree *p, vla_fields = NULL_TREE, *q = &vla_fields;
/* Move VLA fields to the end. */
p = &TYPE_FIELDS (ctx->record_type);
while (*p)
if (!TYPE_SIZE_UNIT (TREE_TYPE (*p))
|| ! TREE_CONSTANT (TYPE_SIZE_UNIT (TREE_TYPE (*p))))
{
*q = *p;
*p = TREE_CHAIN (*p);
TREE_CHAIN (*q) = NULL_TREE;
q = &TREE_CHAIN (*q);
}
else
p = &DECL_CHAIN (*p);
*p = vla_fields;
layout_type (ctx->record_type);
fixup_child_record_type (ctx);
if (ctx->srecord_type)
layout_type (ctx->srecord_type);
t = fold_convert_loc (loc, long_integer_type_node,
TYPE_SIZE_UNIT (ctx->record_type));
gimple_omp_task_set_arg_size (stmt, t);
t = build_int_cst (long_integer_type_node,
TYPE_ALIGN_UNIT (ctx->record_type));
gimple_omp_task_set_arg_align (stmt, t);
}
}
/* Scan an OpenMP loop directive. */
static void
scan_omp_for (gimple stmt, omp_context *outer_ctx)
{
omp_context *ctx;
size_t i;
ctx = new_omp_context (stmt, outer_ctx);
scan_sharing_clauses (gimple_omp_for_clauses (stmt), ctx);
scan_omp (gimple_omp_for_pre_body_ptr (stmt), ctx);
for (i = 0; i < gimple_omp_for_collapse (stmt); i++)
{
scan_omp_op (gimple_omp_for_index_ptr (stmt, i), ctx);
scan_omp_op (gimple_omp_for_initial_ptr (stmt, i), ctx);
scan_omp_op (gimple_omp_for_final_ptr (stmt, i), ctx);
scan_omp_op (gimple_omp_for_incr_ptr (stmt, i), ctx);
}
scan_omp (gimple_omp_body_ptr (stmt), ctx);
}
/* Scan an OpenMP sections directive. */
static void
scan_omp_sections (gimple stmt, omp_context *outer_ctx)
{
omp_context *ctx;
ctx = new_omp_context (stmt, outer_ctx);
scan_sharing_clauses (gimple_omp_sections_clauses (stmt), ctx);
scan_omp (gimple_omp_body_ptr (stmt), ctx);
}
/* Scan an OpenMP single directive. */
static void
scan_omp_single (gimple stmt, omp_context *outer_ctx)
{
omp_context *ctx;
tree name;
ctx = new_omp_context (stmt, outer_ctx);
ctx->field_map = splay_tree_new (splay_tree_compare_pointers, 0, 0);
ctx->record_type = lang_hooks.types.make_type (RECORD_TYPE);
name = create_tmp_var_name (".omp_copy_s");
name = build_decl (gimple_location (stmt),
TYPE_DECL, name, ctx->record_type);
TYPE_NAME (ctx->record_type) = name;
scan_sharing_clauses (gimple_omp_single_clauses (stmt), ctx);
scan_omp (gimple_omp_body_ptr (stmt), ctx);
if (TYPE_FIELDS (ctx->record_type) == NULL)
ctx->record_type = NULL;
else
layout_type (ctx->record_type);
}
/* Check OpenMP nesting restrictions. */
static bool
check_omp_nesting_restrictions (gimple stmt, omp_context *ctx)
{
switch (gimple_code (stmt))
{
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SINGLE:
case GIMPLE_CALL:
for (; ctx != NULL; ctx = ctx->outer)
switch (gimple_code (ctx->stmt))
{
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_TASK:
if (is_gimple_call (stmt))
{
error_at (gimple_location (stmt),
"barrier region may not be closely nested inside "
"of work-sharing, critical, ordered, master or "
"explicit task region");
return false;
}
error_at (gimple_location (stmt),
"work-sharing region may not be closely nested inside "
"of work-sharing, critical, ordered, master or explicit "
"task region");
return false;
case GIMPLE_OMP_PARALLEL:
return true;
default:
break;
}
break;
case GIMPLE_OMP_MASTER:
for (; ctx != NULL; ctx = ctx->outer)
switch (gimple_code (ctx->stmt))
{
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_TASK:
error_at (gimple_location (stmt),
"master region may not be closely nested inside "
"of work-sharing or explicit task region");
return false;
case GIMPLE_OMP_PARALLEL:
return true;
default:
break;
}
break;
case GIMPLE_OMP_ORDERED:
for (; ctx != NULL; ctx = ctx->outer)
switch (gimple_code (ctx->stmt))
{
case GIMPLE_OMP_CRITICAL:
case GIMPLE_OMP_TASK:
error_at (gimple_location (stmt),
"ordered region may not be closely nested inside "
"of critical or explicit task region");
return false;
case GIMPLE_OMP_FOR:
if (find_omp_clause (gimple_omp_for_clauses (ctx->stmt),
OMP_CLAUSE_ORDERED) == NULL)
{
error_at (gimple_location (stmt),
"ordered region must be closely nested inside "
"a loop region with an ordered clause");
return false;
}
return true;
case GIMPLE_OMP_PARALLEL:
return true;
default:
break;
}
break;
case GIMPLE_OMP_CRITICAL:
for (; ctx != NULL; ctx = ctx->outer)
if (gimple_code (ctx->stmt) == GIMPLE_OMP_CRITICAL
&& (gimple_omp_critical_name (stmt)
== gimple_omp_critical_name (ctx->stmt)))
{
error_at (gimple_location (stmt),
"critical region may not be nested inside a critical "
"region with the same name");
return false;
}
break;
default:
break;
}
return true;
}
/* Helper function scan_omp.
Callback for walk_tree or operators in walk_gimple_stmt used to
scan for OpenMP directives in TP. */
static tree
scan_omp_1_op (tree *tp, int *walk_subtrees, void *data)
{
struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
omp_context *ctx = (omp_context *) wi->info;
tree t = *tp;
switch (TREE_CODE (t))
{
case VAR_DECL:
case PARM_DECL:
case LABEL_DECL:
case RESULT_DECL:
if (ctx)
*tp = remap_decl (t, &ctx->cb);
break;
default:
if (ctx && TYPE_P (t))
*tp = remap_type (t, &ctx->cb);
else if (!DECL_P (t))
{
*walk_subtrees = 1;
if (ctx)
{
tree tem = remap_type (TREE_TYPE (t), &ctx->cb);
if (tem != TREE_TYPE (t))
{
if (TREE_CODE (t) == INTEGER_CST)
*tp = build_int_cst_wide (tem,
TREE_INT_CST_LOW (t),
TREE_INT_CST_HIGH (t));
else
TREE_TYPE (t) = tem;
}
}
}
break;
}
return NULL_TREE;
}
/* Helper function for scan_omp.
Callback for walk_gimple_stmt used to scan for OpenMP directives in
the current statement in GSI. */
static tree
scan_omp_1_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
struct walk_stmt_info *wi)
{
gimple stmt = gsi_stmt (*gsi);
omp_context *ctx = (omp_context *) wi->info;
if (gimple_has_location (stmt))
input_location = gimple_location (stmt);
/* Check the OpenMP nesting restrictions. */
if (ctx != NULL)
{
bool remove = false;
if (is_gimple_omp (stmt))
remove = !check_omp_nesting_restrictions (stmt, ctx);
else if (is_gimple_call (stmt))
{
tree fndecl = gimple_call_fndecl (stmt);
if (fndecl && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL
&& DECL_FUNCTION_CODE (fndecl) == BUILT_IN_GOMP_BARRIER)
remove = !check_omp_nesting_restrictions (stmt, ctx);
}
if (remove)
{
stmt = gimple_build_nop ();
gsi_replace (gsi, stmt, false);
}
}
*handled_ops_p = true;
switch (gimple_code (stmt))
{
case GIMPLE_OMP_PARALLEL:
taskreg_nesting_level++;
scan_omp_parallel (gsi, ctx);
taskreg_nesting_level--;
break;
case GIMPLE_OMP_TASK:
taskreg_nesting_level++;
scan_omp_task (gsi, ctx);
taskreg_nesting_level--;
break;
case GIMPLE_OMP_FOR:
scan_omp_for (stmt, ctx);
break;
case GIMPLE_OMP_SECTIONS:
scan_omp_sections (stmt, ctx);
break;
case GIMPLE_OMP_SINGLE:
scan_omp_single (stmt, ctx);
break;
case GIMPLE_OMP_SECTION:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
ctx = new_omp_context (stmt, ctx);
scan_omp (gimple_omp_body_ptr (stmt), ctx);
break;
case GIMPLE_BIND:
{
tree var;
*handled_ops_p = false;
if (ctx)
for (var = gimple_bind_vars (stmt); var ; var = DECL_CHAIN (var))
insert_decl_map (&ctx->cb, var, var);
}
break;
default:
*handled_ops_p = false;
break;
}
return NULL_TREE;
}
/* Scan all the statements starting at the current statement. CTX
contains context information about the OpenMP directives and
clauses found during the scan. */
static void
scan_omp (gimple_seq *body_p, omp_context *ctx)
{
location_t saved_location;
struct walk_stmt_info wi;
memset (&wi, 0, sizeof (wi));
wi.info = ctx;
wi.want_locations = true;
saved_location = input_location;
walk_gimple_seq_mod (body_p, scan_omp_1_stmt, scan_omp_1_op, &wi);
input_location = saved_location;
}
/* Re-gimplification and code generation routines. */
/* Build a call to GOMP_barrier. */
static tree
build_omp_barrier (void)
{
return build_call_expr (builtin_decl_explicit (BUILT_IN_GOMP_BARRIER), 0);
}
/* If a context was created for STMT when it was scanned, return it. */
static omp_context *
maybe_lookup_ctx (gimple stmt)
{
splay_tree_node n;
n = splay_tree_lookup (all_contexts, (splay_tree_key) stmt);
return n ? (omp_context *) n->value : NULL;
}
/* Find the mapping for DECL in CTX or the immediately enclosing
context that has a mapping for DECL.
If CTX is a nested parallel directive, we may have to use the decl
mappings created in CTX's parent context. Suppose that we have the
following parallel nesting (variable UIDs showed for clarity):
iD.1562 = 0;
#omp parallel shared(iD.1562) -> outer parallel
iD.1562 = iD.1562 + 1;
#omp parallel shared (iD.1562) -> inner parallel
iD.1562 = iD.1562 - 1;
Each parallel structure will create a distinct .omp_data_s structure
for copying iD.1562 in/out of the directive:
outer parallel .omp_data_s.1.i -> iD.1562
inner parallel .omp_data_s.2.i -> iD.1562
A shared variable mapping will produce a copy-out operation before
the parallel directive and a copy-in operation after it. So, in
this case we would have:
iD.1562 = 0;
.omp_data_o.1.i = iD.1562;
#omp parallel shared(iD.1562) -> outer parallel
.omp_data_i.1 = &.omp_data_o.1
.omp_data_i.1->i = .omp_data_i.1->i + 1;
.omp_data_o.2.i = iD.1562; -> **
#omp parallel shared(iD.1562) -> inner parallel
.omp_data_i.2 = &.omp_data_o.2
.omp_data_i.2->i = .omp_data_i.2->i - 1;
** This is a problem. The symbol iD.1562 cannot be referenced
inside the body of the outer parallel region. But since we are
emitting this copy operation while expanding the inner parallel
directive, we need to access the CTX structure of the outer
parallel directive to get the correct mapping:
.omp_data_o.2.i = .omp_data_i.1->i
Since there may be other workshare or parallel directives enclosing
the parallel directive, it may be necessary to walk up the context
parent chain. This is not a problem in general because nested
parallelism happens only rarely. */
static tree
lookup_decl_in_outer_ctx (tree decl, omp_context *ctx)
{
tree t;
omp_context *up;
for (up = ctx->outer, t = NULL; up && t == NULL; up = up->outer)
t = maybe_lookup_decl (decl, up);
gcc_assert (!ctx->is_nested || t || is_global_var (decl));
return t ? t : decl;
}
/* Similar to lookup_decl_in_outer_ctx, but return DECL if not found
in outer contexts. */
static tree
maybe_lookup_decl_in_outer_ctx (tree decl, omp_context *ctx)
{
tree t = NULL;
omp_context *up;
for (up = ctx->outer, t = NULL; up && t == NULL; up = up->outer)
t = maybe_lookup_decl (decl, up);
return t ? t : decl;
}
/* Construct the initialization value for reduction CLAUSE. */
tree
omp_reduction_init (tree clause, tree type)
{
location_t loc = OMP_CLAUSE_LOCATION (clause);
switch (OMP_CLAUSE_REDUCTION_CODE (clause))
{
case PLUS_EXPR:
case MINUS_EXPR:
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
case TRUTH_OR_EXPR:
case TRUTH_ORIF_EXPR:
case TRUTH_XOR_EXPR:
case NE_EXPR:
return build_zero_cst (type);
case MULT_EXPR:
case TRUTH_AND_EXPR:
case TRUTH_ANDIF_EXPR:
case EQ_EXPR:
return fold_convert_loc (loc, type, integer_one_node);
case BIT_AND_EXPR:
return fold_convert_loc (loc, type, integer_minus_one_node);
case MAX_EXPR:
if (SCALAR_FLOAT_TYPE_P (type))
{
REAL_VALUE_TYPE max, min;
if (HONOR_INFINITIES (TYPE_MODE (type)))
{
real_inf (&max);
real_arithmetic (&min, NEGATE_EXPR, &max, NULL);
}
else
real_maxval (&min, 1, TYPE_MODE (type));
return build_real (type, min);
}
else
{
gcc_assert (INTEGRAL_TYPE_P (type));
return TYPE_MIN_VALUE (type);
}
case MIN_EXPR:
if (SCALAR_FLOAT_TYPE_P (type))
{
REAL_VALUE_TYPE max;
if (HONOR_INFINITIES (TYPE_MODE (type)))
real_inf (&max);
else
real_maxval (&max, 0, TYPE_MODE (type));
return build_real (type, max);
}
else
{
gcc_assert (INTEGRAL_TYPE_P (type));
return TYPE_MAX_VALUE (type);
}
default:
gcc_unreachable ();
}
}
/* Generate code to implement the input clauses, FIRSTPRIVATE and COPYIN,
from the receiver (aka child) side and initializers for REFERENCE_TYPE
private variables. Initialization statements go in ILIST, while calls
to destructors go in DLIST. */
static void
lower_rec_input_clauses (tree clauses, gimple_seq *ilist, gimple_seq *dlist,
omp_context *ctx)
{
tree c, dtor, copyin_seq, x, ptr;
bool copyin_by_ref = false;
bool lastprivate_firstprivate = false;
int pass;
copyin_seq = NULL;
/* Do all the fixed sized types in the first pass, and the variable sized
types in the second pass. This makes sure that the scalar arguments to
the variable sized types are processed before we use them in the
variable sized operations. */
for (pass = 0; pass < 2; ++pass)
{
for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c))
{
enum omp_clause_code c_kind = OMP_CLAUSE_CODE (c);
tree var, new_var;
bool by_ref;
location_t clause_loc = OMP_CLAUSE_LOCATION (c);
switch (c_kind)
{
case OMP_CLAUSE_PRIVATE:
if (OMP_CLAUSE_PRIVATE_DEBUG (c))
continue;
break;
case OMP_CLAUSE_SHARED:
if (maybe_lookup_decl (OMP_CLAUSE_DECL (c), ctx) == NULL)
{
gcc_assert (is_global_var (OMP_CLAUSE_DECL (c)));
continue;
}
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_COPYIN:
case OMP_CLAUSE_REDUCTION:
break;
case OMP_CLAUSE_LASTPRIVATE:
if (OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c))
{
lastprivate_firstprivate = true;
if (pass != 0)
continue;
}
break;
default:
continue;
}
new_var = var = OMP_CLAUSE_DECL (c);
if (c_kind != OMP_CLAUSE_COPYIN)
new_var = lookup_decl (var, ctx);
if (c_kind == OMP_CLAUSE_SHARED || c_kind == OMP_CLAUSE_COPYIN)
{
if (pass != 0)
continue;
}
else if (is_variable_sized (var))
{
/* For variable sized types, we need to allocate the
actual storage here. Call alloca and store the
result in the pointer decl that we created elsewhere. */
if (pass == 0)
continue;
if (c_kind != OMP_CLAUSE_FIRSTPRIVATE || !is_task_ctx (ctx))
{
gimple stmt;
tree tmp, atmp;
ptr = DECL_VALUE_EXPR (new_var);
gcc_assert (TREE_CODE (ptr) == INDIRECT_REF);
ptr = TREE_OPERAND (ptr, 0);
gcc_assert (DECL_P (ptr));
x = TYPE_SIZE_UNIT (TREE_TYPE (new_var));
/* void *tmp = __builtin_alloca */
atmp = builtin_decl_explicit (BUILT_IN_ALLOCA);
stmt = gimple_build_call (atmp, 1, x);
tmp = create_tmp_var_raw (ptr_type_node, NULL);
gimple_add_tmp_var (tmp);
gimple_call_set_lhs (stmt, tmp);
gimple_seq_add_stmt (ilist, stmt);
x = fold_convert_loc (clause_loc, TREE_TYPE (ptr), tmp);
gimplify_assign (ptr, x, ilist);
}
}
else if (is_reference (var))
{
/* For references that are being privatized for Fortran,
allocate new backing storage for the new pointer
variable. This allows us to avoid changing all the
code that expects a pointer to something that expects
a direct variable. Note that this doesn't apply to
C++, since reference types are disallowed in data
sharing clauses there, except for NRV optimized
return values. */
if (pass == 0)
continue;
x = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (new_var)));
if (c_kind == OMP_CLAUSE_FIRSTPRIVATE && is_task_ctx (ctx))
{
x = build_receiver_ref (var, false, ctx);
x = build_fold_addr_expr_loc (clause_loc, x);
}
else if (TREE_CONSTANT (x))
{
const char *name = NULL;
if (DECL_NAME (var))
name = IDENTIFIER_POINTER (DECL_NAME (new_var));
x = create_tmp_var_raw (TREE_TYPE (TREE_TYPE (new_var)),
name);
gimple_add_tmp_var (x);
TREE_ADDRESSABLE (x) = 1;
x = build_fold_addr_expr_loc (clause_loc, x);
}
else
{
tree atmp = builtin_decl_explicit (BUILT_IN_ALLOCA);
x = build_call_expr_loc (clause_loc, atmp, 1, x);
}
x = fold_convert_loc (clause_loc, TREE_TYPE (new_var), x);
gimplify_assign (new_var, x, ilist);
new_var = build_simple_mem_ref_loc (clause_loc, new_var);
}
else if (c_kind == OMP_CLAUSE_REDUCTION
&& OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
{
if (pass == 0)
continue;
}
else if (pass != 0)
continue;
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_SHARED:
/* Shared global vars are just accessed directly. */
if (is_global_var (new_var))
break;
/* Set up the DECL_VALUE_EXPR for shared variables now. This
needs to be delayed until after fixup_child_record_type so
that we get the correct type during the dereference. */
by_ref = use_pointer_for_field (var, ctx);
x = build_receiver_ref (var, by_ref, ctx);
SET_DECL_VALUE_EXPR (new_var, x);
DECL_HAS_VALUE_EXPR_P (new_var) = 1;
/* ??? If VAR is not passed by reference, and the variable
hasn't been initialized yet, then we'll get a warning for
the store into the omp_data_s structure. Ideally, we'd be
able to notice this and not store anything at all, but
we're generating code too early. Suppress the warning. */
if (!by_ref)
TREE_NO_WARNING (var) = 1;
break;
case OMP_CLAUSE_LASTPRIVATE:
if (OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c))
break;
/* FALLTHRU */
case OMP_CLAUSE_PRIVATE:
if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_PRIVATE)
x = build_outer_var_ref (var, ctx);
else if (OMP_CLAUSE_PRIVATE_OUTER_REF (c))
{
if (is_task_ctx (ctx))
x = build_receiver_ref (var, false, ctx);
else
x = build_outer_var_ref (var, ctx);
}
else
x = NULL;
x = lang_hooks.decls.omp_clause_default_ctor (c, new_var, x);
if (x)
gimplify_and_add (x, ilist);
/* FALLTHRU */
do_dtor:
x = lang_hooks.decls.omp_clause_dtor (c, new_var);
if (x)
{
gimple_seq tseq = NULL;
dtor = x;
gimplify_stmt (&dtor, &tseq);
gimple_seq_add_seq (dlist, tseq);
}
break;
case OMP_CLAUSE_FIRSTPRIVATE:
if (is_task_ctx (ctx))
{
if (is_reference (var) || is_variable_sized (var))
goto do_dtor;
else if (is_global_var (maybe_lookup_decl_in_outer_ctx (var,
ctx))
|| use_pointer_for_field (var, NULL))
{
x = build_receiver_ref (var, false, ctx);
SET_DECL_VALUE_EXPR (new_var, x);
DECL_HAS_VALUE_EXPR_P (new_var) = 1;
goto do_dtor;
}
}
x = build_outer_var_ref (var, ctx);
x = lang_hooks.decls.omp_clause_copy_ctor (c, new_var, x);
gimplify_and_add (x, ilist);
goto do_dtor;
break;
case OMP_CLAUSE_COPYIN:
by_ref = use_pointer_for_field (var, NULL);
x = build_receiver_ref (var, by_ref, ctx);
x = lang_hooks.decls.omp_clause_assign_op (c, new_var, x);
append_to_statement_list (x, &copyin_seq);
copyin_by_ref |= by_ref;
break;
case OMP_CLAUSE_REDUCTION:
if (OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
{
tree placeholder = OMP_CLAUSE_REDUCTION_PLACEHOLDER (c);
x = build_outer_var_ref (var, ctx);
if (is_reference (var))
x = build_fold_addr_expr_loc (clause_loc, x);
SET_DECL_VALUE_EXPR (placeholder, x);
DECL_HAS_VALUE_EXPR_P (placeholder) = 1;
lower_omp (&OMP_CLAUSE_REDUCTION_GIMPLE_INIT (c), ctx);
gimple_seq_add_seq (ilist,
OMP_CLAUSE_REDUCTION_GIMPLE_INIT (c));
OMP_CLAUSE_REDUCTION_GIMPLE_INIT (c) = NULL;
DECL_HAS_VALUE_EXPR_P (placeholder) = 0;
}
else
{
x = omp_reduction_init (c, TREE_TYPE (new_var));
gcc_assert (TREE_CODE (TREE_TYPE (new_var)) != ARRAY_TYPE);
gimplify_assign (new_var, x, ilist);
}
break;
default:
gcc_unreachable ();
}
}
}
/* The copyin sequence is not to be executed by the main thread, since
that would result in self-copies. Perhaps not visible to scalars,
but it certainly is to C++ operator=. */
if (copyin_seq)
{
x = build_call_expr (builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM),
0);
x = build2 (NE_EXPR, boolean_type_node, x,
build_int_cst (TREE_TYPE (x), 0));
x = build3 (COND_EXPR, void_type_node, x, copyin_seq, NULL);
gimplify_and_add (x, ilist);
}
/* If any copyin variable is passed by reference, we must ensure the
master thread doesn't modify it before it is copied over in all
threads. Similarly for variables in both firstprivate and
lastprivate clauses we need to ensure the lastprivate copying
happens after firstprivate copying in all threads. */
if (copyin_by_ref || lastprivate_firstprivate)
gimplify_and_add (build_omp_barrier (), ilist);
}
/* Generate code to implement the LASTPRIVATE clauses. This is used for
both parallel and workshare constructs. PREDICATE may be NULL if it's
always true. */
static void
lower_lastprivate_clauses (tree clauses, tree predicate, gimple_seq *stmt_list,
omp_context *ctx)
{
tree x, c, label = NULL;
bool par_clauses = false;
/* Early exit if there are no lastprivate clauses. */
clauses = find_omp_clause (clauses, OMP_CLAUSE_LASTPRIVATE);
if (clauses == NULL)
{
/* If this was a workshare clause, see if it had been combined
with its parallel. In that case, look for the clauses on the
parallel statement itself. */
if (is_parallel_ctx (ctx))
return;
ctx = ctx->outer;
if (ctx == NULL || !is_parallel_ctx (ctx))
return;
clauses = find_omp_clause (gimple_omp_parallel_clauses (ctx->stmt),
OMP_CLAUSE_LASTPRIVATE);
if (clauses == NULL)
return;
par_clauses = true;
}
if (predicate)
{
gimple stmt;
tree label_true, arm1, arm2;
label = create_artificial_label (UNKNOWN_LOCATION);
label_true = create_artificial_label (UNKNOWN_LOCATION);
arm1 = TREE_OPERAND (predicate, 0);
arm2 = TREE_OPERAND (predicate, 1);
gimplify_expr (&arm1, stmt_list, NULL, is_gimple_val, fb_rvalue);
gimplify_expr (&arm2, stmt_list, NULL, is_gimple_val, fb_rvalue);
stmt = gimple_build_cond (TREE_CODE (predicate), arm1, arm2,
label_true, label);
gimple_seq_add_stmt (stmt_list, stmt);
gimple_seq_add_stmt (stmt_list, gimple_build_label (label_true));
}
for (c = clauses; c ;)
{
tree var, new_var;
location_t clause_loc = OMP_CLAUSE_LOCATION (c);
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_LASTPRIVATE)
{
var = OMP_CLAUSE_DECL (c);
new_var = lookup_decl (var, ctx);
if (OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c))
{
lower_omp (&OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c), ctx);
gimple_seq_add_seq (stmt_list,
OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c));
}
OMP_CLAUSE_LASTPRIVATE_GIMPLE_SEQ (c) = NULL;
x = build_outer_var_ref (var, ctx);
if (is_reference (var))
new_var = build_simple_mem_ref_loc (clause_loc, new_var);
x = lang_hooks.decls.omp_clause_assign_op (c, x, new_var);
gimplify_and_add (x, stmt_list);
}
c = OMP_CLAUSE_CHAIN (c);
if (c == NULL && !par_clauses)
{
/* If this was a workshare clause, see if it had been combined
with its parallel. In that case, continue looking for the
clauses also on the parallel statement itself. */
if (is_parallel_ctx (ctx))
break;
ctx = ctx->outer;
if (ctx == NULL || !is_parallel_ctx (ctx))
break;
c = find_omp_clause (gimple_omp_parallel_clauses (ctx->stmt),
OMP_CLAUSE_LASTPRIVATE);
par_clauses = true;
}
}
if (label)
gimple_seq_add_stmt (stmt_list, gimple_build_label (label));
}
/* Generate code to implement the REDUCTION clauses. */
static void
lower_reduction_clauses (tree clauses, gimple_seq *stmt_seqp, omp_context *ctx)
{
gimple_seq sub_seq = NULL;
gimple stmt;
tree x, c;
int count = 0;
/* First see if there is exactly one reduction clause. Use OMP_ATOMIC
update in that case, otherwise use a lock. */
for (c = clauses; c && count < 2; c = OMP_CLAUSE_CHAIN (c))
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION)
{
if (OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
{
/* Never use OMP_ATOMIC for array reductions. */
count = -1;
break;
}
count++;
}
if (count == 0)
return;
for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c))
{
tree var, ref, new_var;
enum tree_code code;
location_t clause_loc = OMP_CLAUSE_LOCATION (c);
if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_REDUCTION)
continue;
var = OMP_CLAUSE_DECL (c);
new_var = lookup_decl (var, ctx);
if (is_reference (var))
new_var = build_simple_mem_ref_loc (clause_loc, new_var);
ref = build_outer_var_ref (var, ctx);
code = OMP_CLAUSE_REDUCTION_CODE (c);
/* reduction(-:var) sums up the partial results, so it acts
identically to reduction(+:var). */
if (code == MINUS_EXPR)
code = PLUS_EXPR;
if (count == 1)
{
tree addr = build_fold_addr_expr_loc (clause_loc, ref);
addr = save_expr (addr);
ref = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (addr)), addr);
x = fold_build2_loc (clause_loc, code, TREE_TYPE (ref), ref, new_var);
x = build2 (OMP_ATOMIC, void_type_node, addr, x);
gimplify_and_add (x, stmt_seqp);
return;
}
if (OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
{
tree placeholder = OMP_CLAUSE_REDUCTION_PLACEHOLDER (c);
if (is_reference (var))
ref = build_fold_addr_expr_loc (clause_loc, ref);
SET_DECL_VALUE_EXPR (placeholder, ref);
DECL_HAS_VALUE_EXPR_P (placeholder) = 1;
lower_omp (&OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (c), ctx);
gimple_seq_add_seq (&sub_seq, OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (c));
OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (c) = NULL;
OMP_CLAUSE_REDUCTION_PLACEHOLDER (c) = NULL;
}
else
{
x = build2 (code, TREE_TYPE (ref), ref, new_var);
ref = build_outer_var_ref (var, ctx);
gimplify_assign (ref, x, &sub_seq);
}
}
stmt = gimple_build_call (builtin_decl_explicit (BUILT_IN_GOMP_ATOMIC_START),
0);
gimple_seq_add_stmt (stmt_seqp, stmt);
gimple_seq_add_seq (stmt_seqp, sub_seq);
stmt = gimple_build_call (builtin_decl_explicit (BUILT_IN_GOMP_ATOMIC_END),
0);
gimple_seq_add_stmt (stmt_seqp, stmt);
}
/* Generate code to implement the COPYPRIVATE clauses. */
static void
lower_copyprivate_clauses (tree clauses, gimple_seq *slist, gimple_seq *rlist,
omp_context *ctx)
{
tree c;
for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c))
{
tree var, new_var, ref, x;
bool by_ref;
location_t clause_loc = OMP_CLAUSE_LOCATION (c);
if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_COPYPRIVATE)
continue;
var = OMP_CLAUSE_DECL (c);
by_ref = use_pointer_for_field (var, NULL);
ref = build_sender_ref (var, ctx);
x = new_var = lookup_decl_in_outer_ctx (var, ctx);
if (by_ref)
{
x = build_fold_addr_expr_loc (clause_loc, new_var);
x = fold_convert_loc (clause_loc, TREE_TYPE (ref), x);
}
gimplify_assign (ref, x, slist);
ref = build_receiver_ref (var, false, ctx);
if (by_ref)
{
ref = fold_convert_loc (clause_loc,
build_pointer_type (TREE_TYPE (new_var)),
ref);
ref = build_fold_indirect_ref_loc (clause_loc, ref);
}
if (is_reference (var))
{
ref = fold_convert_loc (clause_loc, TREE_TYPE (new_var), ref);
ref = build_simple_mem_ref_loc (clause_loc, ref);
new_var = build_simple_mem_ref_loc (clause_loc, new_var);
}
x = lang_hooks.decls.omp_clause_assign_op (c, new_var, ref);
gimplify_and_add (x, rlist);
}
}
/* Generate code to implement the clauses, FIRSTPRIVATE, COPYIN, LASTPRIVATE,
and REDUCTION from the sender (aka parent) side. */
static void
lower_send_clauses (tree clauses, gimple_seq *ilist, gimple_seq *olist,
omp_context *ctx)
{
tree c;
for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c))
{
tree val, ref, x, var;
bool by_ref, do_in = false, do_out = false;
location_t clause_loc = OMP_CLAUSE_LOCATION (c);
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_PRIVATE:
if (OMP_CLAUSE_PRIVATE_OUTER_REF (c))
break;
continue;
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_COPYIN:
case OMP_CLAUSE_LASTPRIVATE:
case OMP_CLAUSE_REDUCTION:
break;
default:
continue;
}
val = OMP_CLAUSE_DECL (c);
var = lookup_decl_in_outer_ctx (val, ctx);
if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_COPYIN
&& is_global_var (var))
continue;
if (is_variable_sized (val))
continue;
by_ref = use_pointer_for_field (val, NULL);
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_PRIVATE:
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_COPYIN:
do_in = true;
break;
case OMP_CLAUSE_LASTPRIVATE:
if (by_ref || is_reference (val))
{
if (OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c))
continue;
do_in = true;
}
else
{
do_out = true;
if (lang_hooks.decls.omp_private_outer_ref (val))
do_in = true;
}
break;
case OMP_CLAUSE_REDUCTION:
do_in = true;
do_out = !(by_ref || is_reference (val));
break;
default:
gcc_unreachable ();
}
if (do_in)
{
ref = build_sender_ref (val, ctx);
x = by_ref ? build_fold_addr_expr_loc (clause_loc, var) : var;
gimplify_assign (ref, x, ilist);
if (is_task_ctx (ctx))
DECL_ABSTRACT_ORIGIN (TREE_OPERAND (ref, 1)) = NULL;
}
if (do_out)
{
ref = build_sender_ref (val, ctx);
gimplify_assign (var, ref, olist);
}
}
}
/* Generate code to implement SHARED from the sender (aka parent)
side. This is trickier, since GIMPLE_OMP_PARALLEL_CLAUSES doesn't
list things that got automatically shared. */
static void
lower_send_shared_vars (gimple_seq *ilist, gimple_seq *olist, omp_context *ctx)
{
tree var, ovar, nvar, f, x, record_type;
if (ctx->record_type == NULL)
return;
record_type = ctx->srecord_type ? ctx->srecord_type : ctx->record_type;
for (f = TYPE_FIELDS (record_type); f ; f = DECL_CHAIN (f))
{
ovar = DECL_ABSTRACT_ORIGIN (f);
nvar = maybe_lookup_decl (ovar, ctx);
if (!nvar || !DECL_HAS_VALUE_EXPR_P (nvar))
continue;
/* If CTX is a nested parallel directive. Find the immediately
enclosing parallel or workshare construct that contains a
mapping for OVAR. */
var = lookup_decl_in_outer_ctx (ovar, ctx);
if (use_pointer_for_field (ovar, ctx))
{
x = build_sender_ref (ovar, ctx);
var = build_fold_addr_expr (var);
gimplify_assign (x, var, ilist);
}
else
{
x = build_sender_ref (ovar, ctx);
gimplify_assign (x, var, ilist);
if (!TREE_READONLY (var)
/* We don't need to receive a new reference to a result
or parm decl. In fact we may not store to it as we will
invalidate any pending RSO and generate wrong gimple
during inlining. */
&& !((TREE_CODE (var) == RESULT_DECL
|| TREE_CODE (var) == PARM_DECL)
&& DECL_BY_REFERENCE (var)))
{
x = build_sender_ref (ovar, ctx);
gimplify_assign (var, x, olist);
}
}
}
}
/* A convenience function to build an empty GIMPLE_COND with just the
condition. */
static gimple
gimple_build_cond_empty (tree cond)
{
enum tree_code pred_code;
tree lhs, rhs;
gimple_cond_get_ops_from_tree (cond, &pred_code, &lhs, &rhs);
return gimple_build_cond (pred_code, lhs, rhs, NULL_TREE, NULL_TREE);
}
/* Build the function calls to GOMP_parallel_start etc to actually
generate the parallel operation. REGION is the parallel region
being expanded. BB is the block where to insert the code. WS_ARGS
will be set if this is a call to a combined parallel+workshare
construct, it contains the list of additional arguments needed by
the workshare construct. */
static void
expand_parallel_call (struct omp_region *region, basic_block bb,
gimple entry_stmt, VEC(tree,gc) *ws_args)
{
tree t, t1, t2, val, cond, c, clauses;
gimple_stmt_iterator gsi;
gimple stmt;
enum built_in_function start_ix;
int start_ix2;
location_t clause_loc;
VEC(tree,gc) *args;
clauses = gimple_omp_parallel_clauses (entry_stmt);
/* Determine what flavor of GOMP_parallel_start we will be
emitting. */
start_ix = BUILT_IN_GOMP_PARALLEL_START;
if (is_combined_parallel (region))
{
switch (region->inner->type)
{
case GIMPLE_OMP_FOR:
gcc_assert (region->inner->sched_kind != OMP_CLAUSE_SCHEDULE_AUTO);
start_ix2 = ((int)BUILT_IN_GOMP_PARALLEL_LOOP_STATIC_START
+ (region->inner->sched_kind
== OMP_CLAUSE_SCHEDULE_RUNTIME
? 3 : region->inner->sched_kind));
start_ix = (enum built_in_function)start_ix2;
break;
case GIMPLE_OMP_SECTIONS:
start_ix = BUILT_IN_GOMP_PARALLEL_SECTIONS_START;
break;
default:
gcc_unreachable ();
}
}
/* By default, the value of NUM_THREADS is zero (selected at run time)
and there is no conditional. */
cond = NULL_TREE;
val = build_int_cst (unsigned_type_node, 0);
c = find_omp_clause (clauses, OMP_CLAUSE_IF);
if (c)
cond = OMP_CLAUSE_IF_EXPR (c);
c = find_omp_clause (clauses, OMP_CLAUSE_NUM_THREADS);
if (c)
{
val = OMP_CLAUSE_NUM_THREADS_EXPR (c);
clause_loc = OMP_CLAUSE_LOCATION (c);
}
else
clause_loc = gimple_location (entry_stmt);
/* Ensure 'val' is of the correct type. */
val = fold_convert_loc (clause_loc, unsigned_type_node, val);
/* If we found the clause 'if (cond)', build either
(cond != 0) or (cond ? val : 1u). */
if (cond)
{
gimple_stmt_iterator gsi;
cond = gimple_boolify (cond);
if (integer_zerop (val))
val = fold_build2_loc (clause_loc,
EQ_EXPR, unsigned_type_node, cond,
build_int_cst (TREE_TYPE (cond), 0));
else
{
basic_block cond_bb, then_bb, else_bb;
edge e, e_then, e_else;
tree tmp_then, tmp_else, tmp_join, tmp_var;
tmp_var = create_tmp_var (TREE_TYPE (val), NULL);
if (gimple_in_ssa_p (cfun))
{
tmp_then = make_ssa_name (tmp_var, NULL);
tmp_else = make_ssa_name (tmp_var, NULL);
tmp_join = make_ssa_name (tmp_var, NULL);
}
else
{
tmp_then = tmp_var;
tmp_else = tmp_var;
tmp_join = tmp_var;
}
e = split_block (bb, NULL);
cond_bb = e->src;
bb = e->dest;
remove_edge (e);
then_bb = create_empty_bb (cond_bb);
else_bb = create_empty_bb (then_bb);
set_immediate_dominator (CDI_DOMINATORS, then_bb, cond_bb);
set_immediate_dominator (CDI_DOMINATORS, else_bb, cond_bb);
stmt = gimple_build_cond_empty (cond);
gsi = gsi_start_bb (cond_bb);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
gsi = gsi_start_bb (then_bb);
stmt = gimple_build_assign (tmp_then, val);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
gsi = gsi_start_bb (else_bb);
stmt = gimple_build_assign
(tmp_else, build_int_cst (unsigned_type_node, 1));
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
make_edge (cond_bb, then_bb, EDGE_TRUE_VALUE);
make_edge (cond_bb, else_bb, EDGE_FALSE_VALUE);
e_then = make_edge (then_bb, bb, EDGE_FALLTHRU);
e_else = make_edge (else_bb, bb, EDGE_FALLTHRU);
if (gimple_in_ssa_p (cfun))
{
gimple phi = create_phi_node (tmp_join, bb);
add_phi_arg (phi, tmp_then, e_then, UNKNOWN_LOCATION);
add_phi_arg (phi, tmp_else, e_else, UNKNOWN_LOCATION);
}
val = tmp_join;
}
gsi = gsi_start_bb (bb);
val = force_gimple_operand_gsi (&gsi, val, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
}
gsi = gsi_last_bb (bb);
t = gimple_omp_parallel_data_arg (entry_stmt);
if (t == NULL)
t1 = null_pointer_node;
else
t1 = build_fold_addr_expr (t);
t2 = build_fold_addr_expr (gimple_omp_parallel_child_fn (entry_stmt));
args = VEC_alloc (tree, gc, 3 + VEC_length (tree, ws_args));
VEC_quick_push (tree, args, t2);
VEC_quick_push (tree, args, t1);
VEC_quick_push (tree, args, val);
VEC_splice (tree, args, ws_args);
t = build_call_expr_loc_vec (UNKNOWN_LOCATION,
builtin_decl_explicit (start_ix), args);
force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
t = gimple_omp_parallel_data_arg (entry_stmt);
if (t == NULL)
t = null_pointer_node;
else
t = build_fold_addr_expr (t);
t = build_call_expr_loc (gimple_location (entry_stmt),
gimple_omp_parallel_child_fn (entry_stmt), 1, t);
force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
t = build_call_expr_loc (gimple_location (entry_stmt),
builtin_decl_explicit (BUILT_IN_GOMP_PARALLEL_END),
0);
force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
}
/* Build the function call to GOMP_task to actually
generate the task operation. BB is the block where to insert the code. */
static void
expand_task_call (basic_block bb, gimple entry_stmt)
{
tree t, t1, t2, t3, flags, cond, c, c2, clauses;
gimple_stmt_iterator gsi;
location_t loc = gimple_location (entry_stmt);
clauses = gimple_omp_task_clauses (entry_stmt);
c = find_omp_clause (clauses, OMP_CLAUSE_IF);
if (c)
cond = gimple_boolify (OMP_CLAUSE_IF_EXPR (c));
else
cond = boolean_true_node;
c = find_omp_clause (clauses, OMP_CLAUSE_UNTIED);
c2 = find_omp_clause (clauses, OMP_CLAUSE_MERGEABLE);
flags = build_int_cst (unsigned_type_node,
(c ? 1 : 0) + (c2 ? 4 : 0));
c = find_omp_clause (clauses, OMP_CLAUSE_FINAL);
if (c)
{
c = gimple_boolify (OMP_CLAUSE_FINAL_EXPR (c));
c = fold_build3_loc (loc, COND_EXPR, unsigned_type_node, c,
build_int_cst (unsigned_type_node, 2),
build_int_cst (unsigned_type_node, 0));
flags = fold_build2_loc (loc, PLUS_EXPR, unsigned_type_node, flags, c);
}
gsi = gsi_last_bb (bb);
t = gimple_omp_task_data_arg (entry_stmt);
if (t == NULL)
t2 = null_pointer_node;
else
t2 = build_fold_addr_expr_loc (loc, t);
t1 = build_fold_addr_expr_loc (loc, gimple_omp_task_child_fn (entry_stmt));
t = gimple_omp_task_copy_fn (entry_stmt);
if (t == NULL)
t3 = null_pointer_node;
else
t3 = build_fold_addr_expr_loc (loc, t);
t = build_call_expr (builtin_decl_explicit (BUILT_IN_GOMP_TASK),
7, t1, t2, t3,
gimple_omp_task_arg_size (entry_stmt),
gimple_omp_task_arg_align (entry_stmt), cond, flags);
force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
}
/* If exceptions are enabled, wrap the statements in BODY in a MUST_NOT_THROW
catch handler and return it. This prevents programs from violating the
structured block semantics with throws. */
static gimple_seq
maybe_catch_exception (gimple_seq body)
{
gimple g;
tree decl;
if (!flag_exceptions)
return body;
if (lang_hooks.eh_protect_cleanup_actions != NULL)
decl = lang_hooks.eh_protect_cleanup_actions ();
else
decl = builtin_decl_explicit (BUILT_IN_TRAP);
g = gimple_build_eh_must_not_throw (decl);
g = gimple_build_try (body, gimple_seq_alloc_with_stmt (g),
GIMPLE_TRY_CATCH);
return gimple_seq_alloc_with_stmt (g);
}
/* Chain all the DECLs in LIST by their TREE_CHAIN fields. */
static tree
vec2chain (VEC(tree,gc) *v)
{
tree chain = NULL_TREE, t;
unsigned ix;
FOR_EACH_VEC_ELT_REVERSE (tree, v, ix, t)
{
DECL_CHAIN (t) = chain;
chain = t;
}
return chain;
}
/* Remove barriers in REGION->EXIT's block. Note that this is only
valid for GIMPLE_OMP_PARALLEL regions. Since the end of a parallel region
is an implicit barrier, any workshare inside the GIMPLE_OMP_PARALLEL that
left a barrier at the end of the GIMPLE_OMP_PARALLEL region can now be
removed. */
static void
remove_exit_barrier (struct omp_region *region)
{
gimple_stmt_iterator gsi;
basic_block exit_bb;
edge_iterator ei;
edge e;
gimple stmt;
int any_addressable_vars = -1;
exit_bb = region->exit;
/* If the parallel region doesn't return, we don't have REGION->EXIT
block at all. */
if (! exit_bb)
return;
/* The last insn in the block will be the parallel's GIMPLE_OMP_RETURN. The
workshare's GIMPLE_OMP_RETURN will be in a preceding block. The kinds of
statements that can appear in between are extremely limited -- no
memory operations at all. Here, we allow nothing at all, so the
only thing we allow to precede this GIMPLE_OMP_RETURN is a label. */
gsi = gsi_last_bb (exit_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_RETURN);
gsi_prev (&gsi);
if (!gsi_end_p (gsi) && gimple_code (gsi_stmt (gsi)) != GIMPLE_LABEL)
return;
FOR_EACH_EDGE (e, ei, exit_bb->preds)
{
gsi = gsi_last_bb (e->src);
if (gsi_end_p (gsi))
continue;
stmt = gsi_stmt (gsi);
if (gimple_code (stmt) == GIMPLE_OMP_RETURN
&& !gimple_omp_return_nowait_p (stmt))
{
/* OpenMP 3.0 tasks unfortunately prevent this optimization
in many cases. If there could be tasks queued, the barrier
might be needed to let the tasks run before some local
variable of the parallel that the task uses as shared
runs out of scope. The task can be spawned either
from within current function (this would be easy to check)
or from some function it calls and gets passed an address
of such a variable. */
if (any_addressable_vars < 0)
{
gimple parallel_stmt = last_stmt (region->entry);
tree child_fun = gimple_omp_parallel_child_fn (parallel_stmt);
tree local_decls, block, decl;
unsigned ix;
any_addressable_vars = 0;
FOR_EACH_LOCAL_DECL (DECL_STRUCT_FUNCTION (child_fun), ix, decl)
if (TREE_ADDRESSABLE (decl))
{
any_addressable_vars = 1;
break;
}
for (block = gimple_block (stmt);
!any_addressable_vars
&& block
&& TREE_CODE (block) == BLOCK;
block = BLOCK_SUPERCONTEXT (block))
{
for (local_decls = BLOCK_VARS (block);
local_decls;
local_decls = DECL_CHAIN (local_decls))
if (TREE_ADDRESSABLE (local_decls))
{
any_addressable_vars = 1;
break;
}
if (block == gimple_block (parallel_stmt))
break;
}
}
if (!any_addressable_vars)
gimple_omp_return_set_nowait (stmt);
}
}
}
static void
remove_exit_barriers (struct omp_region *region)
{
if (region->type == GIMPLE_OMP_PARALLEL)
remove_exit_barrier (region);
if (region->inner)
{
region = region->inner;
remove_exit_barriers (region);
while (region->next)
{
region = region->next;
remove_exit_barriers (region);
}
}
}
/* Optimize omp_get_thread_num () and omp_get_num_threads ()
calls. These can't be declared as const functions, but
within one parallel body they are constant, so they can be
transformed there into __builtin_omp_get_{thread_num,num_threads} ()
which are declared const. Similarly for task body, except
that in untied task omp_get_thread_num () can change at any task
scheduling point. */
static void
optimize_omp_library_calls (gimple entry_stmt)
{
basic_block bb;
gimple_stmt_iterator gsi;
tree thr_num_tree = builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM);
tree thr_num_id = DECL_ASSEMBLER_NAME (thr_num_tree);
tree num_thr_tree = builtin_decl_explicit (BUILT_IN_OMP_GET_NUM_THREADS);
tree num_thr_id = DECL_ASSEMBLER_NAME (num_thr_tree);
bool untied_task = (gimple_code (entry_stmt) == GIMPLE_OMP_TASK
&& find_omp_clause (gimple_omp_task_clauses (entry_stmt),
OMP_CLAUSE_UNTIED) != NULL);
FOR_EACH_BB (bb)
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple call = gsi_stmt (gsi);
tree decl;
if (is_gimple_call (call)
&& (decl = gimple_call_fndecl (call))
&& DECL_EXTERNAL (decl)
&& TREE_PUBLIC (decl)
&& DECL_INITIAL (decl) == NULL)
{
tree built_in;
if (DECL_NAME (decl) == thr_num_id)
{
/* In #pragma omp task untied omp_get_thread_num () can change
during the execution of the task region. */
if (untied_task)
continue;
built_in = builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM);
}
else if (DECL_NAME (decl) == num_thr_id)
built_in = builtin_decl_explicit (BUILT_IN_OMP_GET_NUM_THREADS);
else
continue;
if (DECL_ASSEMBLER_NAME (decl) != DECL_ASSEMBLER_NAME (built_in)
|| gimple_call_num_args (call) != 0)
continue;
if (flag_exceptions && !TREE_NOTHROW (decl))
continue;
if (TREE_CODE (TREE_TYPE (decl)) != FUNCTION_TYPE
|| !types_compatible_p (TREE_TYPE (TREE_TYPE (decl)),
TREE_TYPE (TREE_TYPE (built_in))))
continue;
gimple_call_set_fndecl (call, built_in);
}
}
}
/* Expand the OpenMP parallel or task directive starting at REGION. */
static void
expand_omp_taskreg (struct omp_region *region)
{
basic_block entry_bb, exit_bb, new_bb;
struct function *child_cfun;
tree child_fn, block, t;
gimple_stmt_iterator gsi;
gimple entry_stmt, stmt;
edge e;
VEC(tree,gc) *ws_args;
entry_stmt = last_stmt (region->entry);
child_fn = gimple_omp_taskreg_child_fn (entry_stmt);
child_cfun = DECL_STRUCT_FUNCTION (child_fn);
entry_bb = region->entry;
exit_bb = region->exit;
if (is_combined_parallel (region))
ws_args = region->ws_args;
else
ws_args = NULL;
if (child_cfun->cfg)
{
/* Due to inlining, it may happen that we have already outlined
the region, in which case all we need to do is make the
sub-graph unreachable and emit the parallel call. */
edge entry_succ_e, exit_succ_e;
gimple_stmt_iterator gsi;
entry_succ_e = single_succ_edge (entry_bb);
gsi = gsi_last_bb (entry_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_PARALLEL
|| gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_TASK);
gsi_remove (&gsi, true);
new_bb = entry_bb;
if (exit_bb)
{
exit_succ_e = single_succ_edge (exit_bb);
make_edge (new_bb, exit_succ_e->dest, EDGE_FALLTHRU);
}
remove_edge_and_dominated_blocks (entry_succ_e);
}
else
{
unsigned srcidx, dstidx, num;
/* If the parallel region needs data sent from the parent
function, then the very first statement (except possible
tree profile counter updates) of the parallel body
is a copy assignment .OMP_DATA_I = &.OMP_DATA_O. Since
&.OMP_DATA_O is passed as an argument to the child function,
we need to replace it with the argument as seen by the child
function.
In most cases, this will end up being the identity assignment
.OMP_DATA_I = .OMP_DATA_I. However, if the parallel body had
a function call that has been inlined, the original PARM_DECL
.OMP_DATA_I may have been converted into a different local
variable. In which case, we need to keep the assignment. */
if (gimple_omp_taskreg_data_arg (entry_stmt))
{
basic_block entry_succ_bb = single_succ (entry_bb);
gimple_stmt_iterator gsi;
tree arg, narg;
gimple parcopy_stmt = NULL;
for (gsi = gsi_start_bb (entry_succ_bb); ; gsi_next (&gsi))
{
gimple stmt;
gcc_assert (!gsi_end_p (gsi));
stmt = gsi_stmt (gsi);
if (gimple_code (stmt) != GIMPLE_ASSIGN)
continue;
if (gimple_num_ops (stmt) == 2)
{
tree arg = gimple_assign_rhs1 (stmt);
/* We're ignore the subcode because we're
effectively doing a STRIP_NOPS. */
if (TREE_CODE (arg) == ADDR_EXPR
&& TREE_OPERAND (arg, 0)
== gimple_omp_taskreg_data_arg (entry_stmt))
{
parcopy_stmt = stmt;
break;
}
}
}
gcc_assert (parcopy_stmt != NULL);
arg = DECL_ARGUMENTS (child_fn);
if (!gimple_in_ssa_p (cfun))
{
if (gimple_assign_lhs (parcopy_stmt) == arg)
gsi_remove (&gsi, true);
else
{
/* ?? Is setting the subcode really necessary ?? */
gimple_omp_set_subcode (parcopy_stmt, TREE_CODE (arg));
gimple_assign_set_rhs1 (parcopy_stmt, arg);
}
}
else
{
/* If we are in ssa form, we must load the value from the default
definition of the argument. That should not be defined now,
since the argument is not used uninitialized. */
gcc_assert (ssa_default_def (cfun, arg) == NULL);
narg = make_ssa_name (arg, gimple_build_nop ());
set_ssa_default_def (cfun, arg, narg);
/* ?? Is setting the subcode really necessary ?? */
gimple_omp_set_subcode (parcopy_stmt, TREE_CODE (narg));
gimple_assign_set_rhs1 (parcopy_stmt, narg);
update_stmt (parcopy_stmt);
}
}
/* Declare local variables needed in CHILD_CFUN. */
block = DECL_INITIAL (child_fn);
BLOCK_VARS (block) = vec2chain (child_cfun->local_decls);
/* The gimplifier could record temporaries in parallel/task block
rather than in containing function's local_decls chain,
which would mean cgraph missed finalizing them. Do it now. */
for (t = BLOCK_VARS (block); t; t = DECL_CHAIN (t))
if (TREE_CODE (t) == VAR_DECL
&& TREE_STATIC (t)
&& !DECL_EXTERNAL (t))
varpool_finalize_decl (t);
DECL_SAVED_TREE (child_fn) = NULL;
/* We'll create a CFG for child_fn, so no gimple body is needed. */
gimple_set_body (child_fn, NULL);
TREE_USED (block) = 1;
/* Reset DECL_CONTEXT on function arguments. */
for (t = DECL_ARGUMENTS (child_fn); t; t = DECL_CHAIN (t))
DECL_CONTEXT (t) = child_fn;
/* Split ENTRY_BB at GIMPLE_OMP_PARALLEL or GIMPLE_OMP_TASK,
so that it can be moved to the child function. */
gsi = gsi_last_bb (entry_bb);
stmt = gsi_stmt (gsi);
gcc_assert (stmt && (gimple_code (stmt) == GIMPLE_OMP_PARALLEL
|| gimple_code (stmt) == GIMPLE_OMP_TASK));
gsi_remove (&gsi, true);
e = split_block (entry_bb, stmt);
entry_bb = e->dest;
single_succ_edge (entry_bb)->flags = EDGE_FALLTHRU;
/* Convert GIMPLE_OMP_RETURN into a RETURN_EXPR. */
if (exit_bb)
{
gsi = gsi_last_bb (exit_bb);
gcc_assert (!gsi_end_p (gsi)
&& gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_RETURN);
stmt = gimple_build_return (NULL);
gsi_insert_after (&gsi, stmt, GSI_SAME_STMT);
gsi_remove (&gsi, true);
}
/* Move the parallel region into CHILD_CFUN. */
if (gimple_in_ssa_p (cfun))
{
init_tree_ssa (child_cfun);
init_ssa_operands (child_cfun);
child_cfun->gimple_df->in_ssa_p = true;
block = NULL_TREE;
}
else
block = gimple_block (entry_stmt);
new_bb = move_sese_region_to_fn (child_cfun, entry_bb, exit_bb, block);
if (exit_bb)
single_succ_edge (new_bb)->flags = EDGE_FALLTHRU;
/* Remove non-local VAR_DECLs from child_cfun->local_decls list. */
num = VEC_length (tree, child_cfun->local_decls);
for (srcidx = 0, dstidx = 0; srcidx < num; srcidx++)
{
t = VEC_index (tree, child_cfun->local_decls, srcidx);
if (DECL_CONTEXT (t) == cfun->decl)
continue;
if (srcidx != dstidx)
VEC_replace (tree, child_cfun->local_decls, dstidx, t);
dstidx++;
}
if (dstidx != num)
VEC_truncate (tree, child_cfun->local_decls, dstidx);
/* Inform the callgraph about the new function. */
DECL_STRUCT_FUNCTION (child_fn)->curr_properties
= cfun->curr_properties & ~PROP_loops;
cgraph_add_new_function (child_fn, true);
/* Fix the callgraph edges for child_cfun. Those for cfun will be
fixed in a following pass. */
push_cfun (child_cfun);
if (optimize)
optimize_omp_library_calls (entry_stmt);
rebuild_cgraph_edges ();
/* Some EH regions might become dead, see PR34608. If
pass_cleanup_cfg isn't the first pass to happen with the
new child, these dead EH edges might cause problems.
Clean them up now. */
if (flag_exceptions)
{
basic_block bb;
bool changed = false;
FOR_EACH_BB (bb)
changed |= gimple_purge_dead_eh_edges (bb);
if (changed)
cleanup_tree_cfg ();
}
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa);
pop_cfun ();
}
/* Emit a library call to launch the children threads. */
if (gimple_code (entry_stmt) == GIMPLE_OMP_PARALLEL)
expand_parallel_call (region, new_bb, entry_stmt, ws_args);
else
expand_task_call (new_bb, entry_stmt);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_only_virtuals);
}
/* A subroutine of expand_omp_for. Generate code for a parallel
loop with any schedule. Given parameters:
for (V = N1; V cond N2; V += STEP) BODY;
where COND is "<" or ">", we generate pseudocode
more = GOMP_loop_foo_start (N1, N2, STEP, CHUNK, &istart0, &iend0);
if (more) goto L0; else goto L3;
L0:
V = istart0;
iend = iend0;
L1:
BODY;
V += STEP;
if (V cond iend) goto L1; else goto L2;
L2:
if (GOMP_loop_foo_next (&istart0, &iend0)) goto L0; else goto L3;
L3:
If this is a combined omp parallel loop, instead of the call to
GOMP_loop_foo_start, we call GOMP_loop_foo_next.
For collapsed loops, given parameters:
collapse(3)
for (V1 = N11; V1 cond1 N12; V1 += STEP1)
for (V2 = N21; V2 cond2 N22; V2 += STEP2)
for (V3 = N31; V3 cond3 N32; V3 += STEP3)
BODY;
we generate pseudocode
if (cond3 is <)
adj = STEP3 - 1;
else
adj = STEP3 + 1;
count3 = (adj + N32 - N31) / STEP3;
if (cond2 is <)
adj = STEP2 - 1;
else
adj = STEP2 + 1;
count2 = (adj + N22 - N21) / STEP2;
if (cond1 is <)
adj = STEP1 - 1;
else
adj = STEP1 + 1;
count1 = (adj + N12 - N11) / STEP1;
count = count1 * count2 * count3;
more = GOMP_loop_foo_start (0, count, 1, CHUNK, &istart0, &iend0);
if (more) goto L0; else goto L3;
L0:
V = istart0;
T = V;
V3 = N31 + (T % count3) * STEP3;
T = T / count3;
V2 = N21 + (T % count2) * STEP2;
T = T / count2;
V1 = N11 + T * STEP1;
iend = iend0;
L1:
BODY;
V += 1;
if (V < iend) goto L10; else goto L2;
L10:
V3 += STEP3;
if (V3 cond3 N32) goto L1; else goto L11;
L11:
V3 = N31;
V2 += STEP2;
if (V2 cond2 N22) goto L1; else goto L12;
L12:
V2 = N21;
V1 += STEP1;
goto L1;
L2:
if (GOMP_loop_foo_next (&istart0, &iend0)) goto L0; else goto L3;
L3:
*/
static void
expand_omp_for_generic (struct omp_region *region,
struct omp_for_data *fd,
enum built_in_function start_fn,
enum built_in_function next_fn)
{
tree type, istart0, iend0, iend;
tree t, vmain, vback, bias = NULL_TREE;
basic_block entry_bb, cont_bb, exit_bb, l0_bb, l1_bb, collapse_bb;
basic_block l2_bb = NULL, l3_bb = NULL;
gimple_stmt_iterator gsi;
gimple stmt;
bool in_combined_parallel = is_combined_parallel (region);
bool broken_loop = region->cont == NULL;
edge e, ne;
tree *counts = NULL;
int i;
gcc_assert (!broken_loop || !in_combined_parallel);
gcc_assert (fd->iter_type == long_integer_type_node
|| !in_combined_parallel);
type = TREE_TYPE (fd->loop.v);
istart0 = create_tmp_var (fd->iter_type, ".istart0");
iend0 = create_tmp_var (fd->iter_type, ".iend0");
TREE_ADDRESSABLE (istart0) = 1;
TREE_ADDRESSABLE (iend0) = 1;
/* See if we need to bias by LLONG_MIN. */
if (fd->iter_type == long_long_unsigned_type_node
&& TREE_CODE (type) == INTEGER_TYPE
&& !TYPE_UNSIGNED (type))
{
tree n1, n2;
if (fd->loop.cond_code == LT_EXPR)
{
n1 = fd->loop.n1;
n2 = fold_build2 (PLUS_EXPR, type, fd->loop.n2, fd->loop.step);
}
else
{
n1 = fold_build2 (MINUS_EXPR, type, fd->loop.n2, fd->loop.step);
n2 = fd->loop.n1;
}
if (TREE_CODE (n1) != INTEGER_CST
|| TREE_CODE (n2) != INTEGER_CST
|| ((tree_int_cst_sgn (n1) < 0) ^ (tree_int_cst_sgn (n2) < 0)))
bias = fold_convert (fd->iter_type, TYPE_MIN_VALUE (type));
}
entry_bb = region->entry;
cont_bb = region->cont;
collapse_bb = NULL;
gcc_assert (EDGE_COUNT (entry_bb->succs) == 2);
gcc_assert (broken_loop
|| BRANCH_EDGE (entry_bb)->dest == FALLTHRU_EDGE (cont_bb)->dest);
l0_bb = split_edge (FALLTHRU_EDGE (entry_bb));
l1_bb = single_succ (l0_bb);
if (!broken_loop)
{
l2_bb = create_empty_bb (cont_bb);
gcc_assert (BRANCH_EDGE (cont_bb)->dest == l1_bb);
gcc_assert (EDGE_COUNT (cont_bb->succs) == 2);
}
else
l2_bb = NULL;
l3_bb = BRANCH_EDGE (entry_bb)->dest;
exit_bb = region->exit;
gsi = gsi_last_bb (entry_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_FOR);
if (fd->collapse > 1)
{
/* collapsed loops need work for expansion in SSA form. */
gcc_assert (!gimple_in_ssa_p (cfun));
counts = (tree *) alloca (fd->collapse * sizeof (tree));
for (i = 0; i < fd->collapse; i++)
{
tree itype = TREE_TYPE (fd->loops[i].v);
if (POINTER_TYPE_P (itype))
itype = signed_type_for (itype);
t = build_int_cst (itype, (fd->loops[i].cond_code == LT_EXPR
? -1 : 1));
t = fold_build2 (PLUS_EXPR, itype,
fold_convert (itype, fd->loops[i].step), t);
t = fold_build2 (PLUS_EXPR, itype, t,
fold_convert (itype, fd->loops[i].n2));
t = fold_build2 (MINUS_EXPR, itype, t,
fold_convert (itype, fd->loops[i].n1));
if (TYPE_UNSIGNED (itype) && fd->loops[i].cond_code == GT_EXPR)
t = fold_build2 (TRUNC_DIV_EXPR, itype,
fold_build1 (NEGATE_EXPR, itype, t),
fold_build1 (NEGATE_EXPR, itype,
fold_convert (itype,
fd->loops[i].step)));
else
t = fold_build2 (TRUNC_DIV_EXPR, itype, t,
fold_convert (itype, fd->loops[i].step));
t = fold_convert (type, t);
if (TREE_CODE (t) == INTEGER_CST)
counts[i] = t;
else
{
counts[i] = create_tmp_reg (type, ".count");
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
true, GSI_SAME_STMT);
stmt = gimple_build_assign (counts[i], t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
}
if (SSA_VAR_P (fd->loop.n2))
{
if (i == 0)
t = counts[0];
else
{
t = fold_build2 (MULT_EXPR, type, fd->loop.n2, counts[i]);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
true, GSI_SAME_STMT);
}
stmt = gimple_build_assign (fd->loop.n2, t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
}
}
}
if (in_combined_parallel)
{
/* In a combined parallel loop, emit a call to
GOMP_loop_foo_next. */
t = build_call_expr (builtin_decl_explicit (next_fn), 2,
build_fold_addr_expr (istart0),
build_fold_addr_expr (iend0));
}
else
{
tree t0, t1, t2, t3, t4;
/* If this is not a combined parallel loop, emit a call to
GOMP_loop_foo_start in ENTRY_BB. */
t4 = build_fold_addr_expr (iend0);
t3 = build_fold_addr_expr (istart0);
t2 = fold_convert (fd->iter_type, fd->loop.step);
if (POINTER_TYPE_P (type)
&& TYPE_PRECISION (type) != TYPE_PRECISION (fd->iter_type))
{
/* Avoid casting pointers to integer of a different size. */
tree itype = signed_type_for (type);
t1 = fold_convert (fd->iter_type, fold_convert (itype, fd->loop.n2));
t0 = fold_convert (fd->iter_type, fold_convert (itype, fd->loop.n1));
}
else
{
t1 = fold_convert (fd->iter_type, fd->loop.n2);
t0 = fold_convert (fd->iter_type, fd->loop.n1);
}
if (bias)
{
t1 = fold_build2 (PLUS_EXPR, fd->iter_type, t1, bias);
t0 = fold_build2 (PLUS_EXPR, fd->iter_type, t0, bias);
}
if (fd->iter_type == long_integer_type_node)
{
if (fd->chunk_size)
{
t = fold_convert (fd->iter_type, fd->chunk_size);
t = build_call_expr (builtin_decl_explicit (start_fn),
6, t0, t1, t2, t, t3, t4);
}
else
t = build_call_expr (builtin_decl_explicit (start_fn),
5, t0, t1, t2, t3, t4);
}
else
{
tree t5;
tree c_bool_type;
tree bfn_decl;
/* The GOMP_loop_ull_*start functions have additional boolean
argument, true for < loops and false for > loops.
In Fortran, the C bool type can be different from
boolean_type_node. */
bfn_decl = builtin_decl_explicit (start_fn);
c_bool_type = TREE_TYPE (TREE_TYPE (bfn_decl));
t5 = build_int_cst (c_bool_type,
fd->loop.cond_code == LT_EXPR ? 1 : 0);
if (fd->chunk_size)
{
tree bfn_decl = builtin_decl_explicit (start_fn);
t = fold_convert (fd->iter_type, fd->chunk_size);
t = build_call_expr (bfn_decl, 7, t5, t0, t1, t2, t, t3, t4);
}
else
t = build_call_expr (builtin_decl_explicit (start_fn),
6, t5, t0, t1, t2, t3, t4);
}
}
if (TREE_TYPE (t) != boolean_type_node)
t = fold_build2 (NE_EXPR, boolean_type_node,
t, build_int_cst (TREE_TYPE (t), 0));
t = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
true, GSI_SAME_STMT);
gsi_insert_after (&gsi, gimple_build_cond_empty (t), GSI_SAME_STMT);
/* Remove the GIMPLE_OMP_FOR statement. */
gsi_remove (&gsi, true);
/* Iteration setup for sequential loop goes in L0_BB. */
gsi = gsi_start_bb (l0_bb);
t = istart0;
if (bias)
t = fold_build2 (MINUS_EXPR, fd->iter_type, t, bias);
if (POINTER_TYPE_P (type))
t = fold_convert (signed_type_for (type), t);
t = fold_convert (type, t);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loop.v, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
t = iend0;
if (bias)
t = fold_build2 (MINUS_EXPR, fd->iter_type, t, bias);
if (POINTER_TYPE_P (type))
t = fold_convert (signed_type_for (type), t);
t = fold_convert (type, t);
iend = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
if (fd->collapse > 1)
{
tree tem = create_tmp_reg (type, ".tem");
stmt = gimple_build_assign (tem, fd->loop.v);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
for (i = fd->collapse - 1; i >= 0; i--)
{
tree vtype = TREE_TYPE (fd->loops[i].v), itype;
itype = vtype;
if (POINTER_TYPE_P (vtype))
itype = signed_type_for (vtype);
t = fold_build2 (TRUNC_MOD_EXPR, type, tem, counts[i]);
t = fold_convert (itype, t);
t = fold_build2 (MULT_EXPR, itype, t,
fold_convert (itype, fd->loops[i].step));
if (POINTER_TYPE_P (vtype))
t = fold_build_pointer_plus (fd->loops[i].n1, t);
else
t = fold_build2 (PLUS_EXPR, itype, fd->loops[i].n1, t);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loops[i].v, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
if (i != 0)
{
t = fold_build2 (TRUNC_DIV_EXPR, type, tem, counts[i]);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (tem, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
}
}
}
if (!broken_loop)
{
/* Code to control the increment and predicate for the sequential
loop goes in the CONT_BB. */
gsi = gsi_last_bb (cont_bb);
stmt = gsi_stmt (gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_CONTINUE);
vmain = gimple_omp_continue_control_use (stmt);
vback = gimple_omp_continue_control_def (stmt);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (vmain, fd->loop.step);
else
t = fold_build2 (PLUS_EXPR, type, vmain, fd->loop.step);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
true, GSI_SAME_STMT);
stmt = gimple_build_assign (vback, t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
t = build2 (fd->loop.cond_code, boolean_type_node, vback, iend);
stmt = gimple_build_cond_empty (t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
/* Remove GIMPLE_OMP_CONTINUE. */
gsi_remove (&gsi, true);
if (fd->collapse > 1)
{
basic_block last_bb, bb;
last_bb = cont_bb;
for (i = fd->collapse - 1; i >= 0; i--)
{
tree vtype = TREE_TYPE (fd->loops[i].v);
bb = create_empty_bb (last_bb);
gsi = gsi_start_bb (bb);
if (i < fd->collapse - 1)
{
e = make_edge (last_bb, bb, EDGE_FALSE_VALUE);
e->probability = REG_BR_PROB_BASE / 8;
t = fd->loops[i + 1].n1;
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loops[i + 1].v, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
}
else
collapse_bb = bb;
set_immediate_dominator (CDI_DOMINATORS, bb, last_bb);
if (POINTER_TYPE_P (vtype))
t = fold_build_pointer_plus (fd->loops[i].v, fd->loops[i].step);
else
t = fold_build2 (PLUS_EXPR, vtype, fd->loops[i].v,
fd->loops[i].step);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loops[i].v, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
if (i > 0)
{
t = fd->loops[i].n2;
t = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
t = fold_build2 (fd->loops[i].cond_code, boolean_type_node,
fd->loops[i].v, t);
stmt = gimple_build_cond_empty (t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
e = make_edge (bb, l1_bb, EDGE_TRUE_VALUE);
e->probability = REG_BR_PROB_BASE * 7 / 8;
}
else
make_edge (bb, l1_bb, EDGE_FALLTHRU);
last_bb = bb;
}
}
/* Emit code to get the next parallel iteration in L2_BB. */
gsi = gsi_start_bb (l2_bb);
t = build_call_expr (builtin_decl_explicit (next_fn), 2,
build_fold_addr_expr (istart0),
build_fold_addr_expr (iend0));
t = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
if (TREE_TYPE (t) != boolean_type_node)
t = fold_build2 (NE_EXPR, boolean_type_node,
t, build_int_cst (TREE_TYPE (t), 0));
stmt = gimple_build_cond_empty (t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
}
/* Add the loop cleanup function. */
gsi = gsi_last_bb (exit_bb);
if (gimple_omp_return_nowait_p (gsi_stmt (gsi)))
t = builtin_decl_explicit (BUILT_IN_GOMP_LOOP_END_NOWAIT);
else
t = builtin_decl_explicit (BUILT_IN_GOMP_LOOP_END);
stmt = gimple_build_call (t, 0);
gsi_insert_after (&gsi, stmt, GSI_SAME_STMT);
gsi_remove (&gsi, true);
/* Connect the new blocks. */
find_edge (entry_bb, l0_bb)->flags = EDGE_TRUE_VALUE;
find_edge (entry_bb, l3_bb)->flags = EDGE_FALSE_VALUE;
if (!broken_loop)
{
gimple_seq phis;
e = find_edge (cont_bb, l3_bb);
ne = make_edge (l2_bb, l3_bb, EDGE_FALSE_VALUE);
phis = phi_nodes (l3_bb);
for (gsi = gsi_start (phis); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple phi = gsi_stmt (gsi);
SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE (phi, ne),
PHI_ARG_DEF_FROM_EDGE (phi, e));
}
remove_edge (e);
make_edge (cont_bb, l2_bb, EDGE_FALSE_VALUE);
if (fd->collapse > 1)
{
e = find_edge (cont_bb, l1_bb);
remove_edge (e);
e = make_edge (cont_bb, collapse_bb, EDGE_TRUE_VALUE);
}
else
{
e = find_edge (cont_bb, l1_bb);
e->flags = EDGE_TRUE_VALUE;
}
e->probability = REG_BR_PROB_BASE * 7 / 8;
find_edge (cont_bb, l2_bb)->probability = REG_BR_PROB_BASE / 8;
make_edge (l2_bb, l0_bb, EDGE_TRUE_VALUE);
set_immediate_dominator (CDI_DOMINATORS, l2_bb,
recompute_dominator (CDI_DOMINATORS, l2_bb));
set_immediate_dominator (CDI_DOMINATORS, l3_bb,
recompute_dominator (CDI_DOMINATORS, l3_bb));
set_immediate_dominator (CDI_DOMINATORS, l0_bb,
recompute_dominator (CDI_DOMINATORS, l0_bb));
set_immediate_dominator (CDI_DOMINATORS, l1_bb,
recompute_dominator (CDI_DOMINATORS, l1_bb));
}
}
/* A subroutine of expand_omp_for. Generate code for a parallel
loop with static schedule and no specified chunk size. Given
parameters:
for (V = N1; V cond N2; V += STEP) BODY;
where COND is "<" or ">", we generate pseudocode
if (cond is <)
adj = STEP - 1;
else
adj = STEP + 1;
if ((__typeof (V)) -1 > 0 && cond is >)
n = -(adj + N2 - N1) / -STEP;
else
n = (adj + N2 - N1) / STEP;
q = n / nthreads;
tt = n % nthreads;
if (threadid < tt) goto L3; else goto L4;
L3:
tt = 0;
q = q + 1;
L4:
s0 = q * threadid + tt;
e0 = s0 + q;
V = s0 * STEP + N1;
if (s0 >= e0) goto L2; else goto L0;
L0:
e = e0 * STEP + N1;
L1:
BODY;
V += STEP;
if (V cond e) goto L1;
L2:
*/
static void
expand_omp_for_static_nochunk (struct omp_region *region,
struct omp_for_data *fd)
{
tree n, q, s0, e0, e, t, tt, nthreads, threadid;
tree type, itype, vmain, vback;
basic_block entry_bb, second_bb, third_bb, exit_bb, seq_start_bb;
basic_block body_bb, cont_bb;
basic_block fin_bb;
gimple_stmt_iterator gsi;
gimple stmt;
edge ep;
itype = type = TREE_TYPE (fd->loop.v);
if (POINTER_TYPE_P (type))
itype = signed_type_for (type);
entry_bb = region->entry;
cont_bb = region->cont;
gcc_assert (EDGE_COUNT (entry_bb->succs) == 2);
gcc_assert (BRANCH_EDGE (entry_bb)->dest == FALLTHRU_EDGE (cont_bb)->dest);
seq_start_bb = split_edge (FALLTHRU_EDGE (entry_bb));
body_bb = single_succ (seq_start_bb);
gcc_assert (BRANCH_EDGE (cont_bb)->dest == body_bb);
gcc_assert (EDGE_COUNT (cont_bb->succs) == 2);
fin_bb = FALLTHRU_EDGE (cont_bb)->dest;
exit_bb = region->exit;
/* Iteration space partitioning goes in ENTRY_BB. */
gsi = gsi_last_bb (entry_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_FOR);
t = build_call_expr (builtin_decl_explicit (BUILT_IN_OMP_GET_NUM_THREADS), 0);
t = fold_convert (itype, t);
nthreads = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
true, GSI_SAME_STMT);
t = build_call_expr (builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM), 0);
t = fold_convert (itype, t);
threadid = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
true, GSI_SAME_STMT);
fd->loop.n1
= force_gimple_operand_gsi (&gsi, fold_convert (type, fd->loop.n1),
true, NULL_TREE, true, GSI_SAME_STMT);
fd->loop.n2
= force_gimple_operand_gsi (&gsi, fold_convert (itype, fd->loop.n2),
true, NULL_TREE, true, GSI_SAME_STMT);
fd->loop.step
= force_gimple_operand_gsi (&gsi, fold_convert (itype, fd->loop.step),
true, NULL_TREE, true, GSI_SAME_STMT);
t = build_int_cst (itype, (fd->loop.cond_code == LT_EXPR ? -1 : 1));
t = fold_build2 (PLUS_EXPR, itype, fd->loop.step, t);
t = fold_build2 (PLUS_EXPR, itype, t, fd->loop.n2);
t = fold_build2 (MINUS_EXPR, itype, t, fold_convert (itype, fd->loop.n1));
if (TYPE_UNSIGNED (itype) && fd->loop.cond_code == GT_EXPR)
t = fold_build2 (TRUNC_DIV_EXPR, itype,
fold_build1 (NEGATE_EXPR, itype, t),
fold_build1 (NEGATE_EXPR, itype, fd->loop.step));
else
t = fold_build2 (TRUNC_DIV_EXPR, itype, t, fd->loop.step);
t = fold_convert (itype, t);
n = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE, true, GSI_SAME_STMT);
q = create_tmp_reg (itype, "q");
t = fold_build2 (TRUNC_DIV_EXPR, itype, n, nthreads);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE, true, GSI_SAME_STMT);
gsi_insert_before (&gsi, gimple_build_assign (q, t), GSI_SAME_STMT);
tt = create_tmp_reg (itype, "tt");
t = fold_build2 (TRUNC_MOD_EXPR, itype, n, nthreads);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE, true, GSI_SAME_STMT);
gsi_insert_before (&gsi, gimple_build_assign (tt, t), GSI_SAME_STMT);
t = build2 (LT_EXPR, boolean_type_node, threadid, tt);
stmt = gimple_build_cond_empty (t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
second_bb = split_block (entry_bb, stmt)->dest;
gsi = gsi_last_bb (second_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_FOR);
gsi_insert_before (&gsi, gimple_build_assign (tt, build_int_cst (itype, 0)),
GSI_SAME_STMT);
stmt = gimple_build_assign_with_ops (PLUS_EXPR, q, q,
build_int_cst (itype, 1));
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
third_bb = split_block (second_bb, stmt)->dest;
gsi = gsi_last_bb (third_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_FOR);
t = build2 (MULT_EXPR, itype, q, threadid);
t = build2 (PLUS_EXPR, itype, t, tt);
s0 = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE, true, GSI_SAME_STMT);
t = fold_build2 (PLUS_EXPR, itype, s0, q);
e0 = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE, true, GSI_SAME_STMT);
t = build2 (GE_EXPR, boolean_type_node, s0, e0);
gsi_insert_before (&gsi, gimple_build_cond_empty (t), GSI_SAME_STMT);
/* Remove the GIMPLE_OMP_FOR statement. */
gsi_remove (&gsi, true);
/* Setup code for sequential iteration goes in SEQ_START_BB. */
gsi = gsi_start_bb (seq_start_bb);
t = fold_convert (itype, s0);
t = fold_build2 (MULT_EXPR, itype, t, fd->loop.step);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (fd->loop.n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, fd->loop.n1);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loop.v, t);
gsi_insert_after (&gsi, stmt, GSI_CONTINUE_LINKING);
t = fold_convert (itype, e0);
t = fold_build2 (MULT_EXPR, itype, t, fd->loop.step);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (fd->loop.n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, fd->loop.n1);
e = force_gimple_operand_gsi (&gsi, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
/* The code controlling the sequential loop replaces the
GIMPLE_OMP_CONTINUE. */
gsi = gsi_last_bb (cont_bb);
stmt = gsi_stmt (gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_CONTINUE);
vmain = gimple_omp_continue_control_use (stmt);
vback = gimple_omp_continue_control_def (stmt);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (vmain, fd->loop.step);
else
t = fold_build2 (PLUS_EXPR, type, vmain, fd->loop.step);
t = force_gimple_operand_gsi (&gsi, t, false, NULL_TREE,
true, GSI_SAME_STMT);
stmt = gimple_build_assign (vback, t);
gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
t = build2 (fd->loop.cond_code, boolean_type_node, vback, e);
gsi_insert_before (&gsi, gimple_build_cond_empty (t), GSI_SAME_STMT);
/* Remove the GIMPLE_OMP_CONTINUE statement. */
gsi_remove (&gsi, true);
/* Replace the GIMPLE_OMP_RETURN with a barrier, or nothing. */
gsi = gsi_last_bb (exit_bb);
if (!gimple_omp_return_nowait_p (gsi_stmt (gsi)))
force_gimple_operand_gsi (&gsi, build_omp_barrier (), false, NULL_TREE,
false, GSI_SAME_STMT);
gsi_remove (&gsi, true);
/* Connect all the blocks. */
ep = make_edge (entry_bb, third_bb, EDGE_FALSE_VALUE);
ep->probability = REG_BR_PROB_BASE / 4 * 3;
ep = find_edge (entry_bb, second_bb);
ep->flags = EDGE_TRUE_VALUE;
ep->probability = REG_BR_PROB_BASE / 4;
find_edge (third_bb, seq_start_bb)->flags = EDGE_FALSE_VALUE;
find_edge (third_bb, fin_bb)->flags = EDGE_TRUE_VALUE;
find_edge (cont_bb, body_bb)->flags = EDGE_TRUE_VALUE;
find_edge (cont_bb, fin_bb)->flags = EDGE_FALSE_VALUE;
set_immediate_dominator (CDI_DOMINATORS, second_bb, entry_bb);
set_immediate_dominator (CDI_DOMINATORS, third_bb, entry_bb);
set_immediate_dominator (CDI_DOMINATORS, seq_start_bb, third_bb);
set_immediate_dominator (CDI_DOMINATORS, body_bb,
recompute_dominator (CDI_DOMINATORS, body_bb));
set_immediate_dominator (CDI_DOMINATORS, fin_bb,
recompute_dominator (CDI_DOMINATORS, fin_bb));
}
/* A subroutine of expand_omp_for. Generate code for a parallel
loop with static schedule and a specified chunk size. Given
parameters:
for (V = N1; V cond N2; V += STEP) BODY;
where COND is "<" or ">", we generate pseudocode
if (cond is <)
adj = STEP - 1;
else
adj = STEP + 1;
if ((__typeof (V)) -1 > 0 && cond is >)
n = -(adj + N2 - N1) / -STEP;
else
n = (adj + N2 - N1) / STEP;
trip = 0;
V = threadid * CHUNK * STEP + N1; -- this extra definition of V is
here so that V is defined
if the loop is not entered
L0:
s0 = (trip * nthreads + threadid) * CHUNK;
e0 = min(s0 + CHUNK, n);
if (s0 < n) goto L1; else goto L4;
L1:
V = s0 * STEP + N1;
e = e0 * STEP + N1;
L2:
BODY;
V += STEP;
if (V cond e) goto L2; else goto L3;
L3:
trip += 1;
goto L0;
L4:
*/
static void
expand_omp_for_static_chunk (struct omp_region *region, struct omp_for_data *fd)
{
tree n, s0, e0, e, t;
tree trip_var, trip_init, trip_main, trip_back, nthreads, threadid;
tree type, itype, v_main, v_back, v_extra;
basic_block entry_bb, exit_bb, body_bb, seq_start_bb, iter_part_bb;
basic_block trip_update_bb, cont_bb, fin_bb;
gimple_stmt_iterator si;
gimple stmt;
edge se;
itype = type = TREE_TYPE (fd->loop.v);
if (POINTER_TYPE_P (type))
itype = signed_type_for (type);
entry_bb = region->entry;
se = split_block (entry_bb, last_stmt (entry_bb));
entry_bb = se->src;
iter_part_bb = se->dest;
cont_bb = region->cont;
gcc_assert (EDGE_COUNT (iter_part_bb->succs) == 2);
gcc_assert (BRANCH_EDGE (iter_part_bb)->dest
== FALLTHRU_EDGE (cont_bb)->dest);
seq_start_bb = split_edge (FALLTHRU_EDGE (iter_part_bb));
body_bb = single_succ (seq_start_bb);
gcc_assert (BRANCH_EDGE (cont_bb)->dest == body_bb);
gcc_assert (EDGE_COUNT (cont_bb->succs) == 2);
fin_bb = FALLTHRU_EDGE (cont_bb)->dest;
trip_update_bb = split_edge (FALLTHRU_EDGE (cont_bb));
exit_bb = region->exit;
/* Trip and adjustment setup goes in ENTRY_BB. */
si = gsi_last_bb (entry_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_FOR);
t = build_call_expr (builtin_decl_explicit (BUILT_IN_OMP_GET_NUM_THREADS), 0);
t = fold_convert (itype, t);
nthreads = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
true, GSI_SAME_STMT);
t = build_call_expr (builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM), 0);
t = fold_convert (itype, t);
threadid = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
true, GSI_SAME_STMT);
fd->loop.n1
= force_gimple_operand_gsi (&si, fold_convert (type, fd->loop.n1),
true, NULL_TREE, true, GSI_SAME_STMT);
fd->loop.n2
= force_gimple_operand_gsi (&si, fold_convert (itype, fd->loop.n2),
true, NULL_TREE, true, GSI_SAME_STMT);
fd->loop.step
= force_gimple_operand_gsi (&si, fold_convert (itype, fd->loop.step),
true, NULL_TREE, true, GSI_SAME_STMT);
fd->chunk_size
= force_gimple_operand_gsi (&si, fold_convert (itype, fd->chunk_size),
true, NULL_TREE, true, GSI_SAME_STMT);
t = build_int_cst (itype, (fd->loop.cond_code == LT_EXPR ? -1 : 1));
t = fold_build2 (PLUS_EXPR, itype, fd->loop.step, t);
t = fold_build2 (PLUS_EXPR, itype, t, fd->loop.n2);
t = fold_build2 (MINUS_EXPR, itype, t, fold_convert (itype, fd->loop.n1));
if (TYPE_UNSIGNED (itype) && fd->loop.cond_code == GT_EXPR)
t = fold_build2 (TRUNC_DIV_EXPR, itype,
fold_build1 (NEGATE_EXPR, itype, t),
fold_build1 (NEGATE_EXPR, itype, fd->loop.step));
else
t = fold_build2 (TRUNC_DIV_EXPR, itype, t, fd->loop.step);
t = fold_convert (itype, t);
n = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
true, GSI_SAME_STMT);
trip_var = create_tmp_reg (itype, ".trip");
if (gimple_in_ssa_p (cfun))
{
trip_init = make_ssa_name (trip_var, NULL);
trip_main = make_ssa_name (trip_var, NULL);
trip_back = make_ssa_name (trip_var, NULL);
}
else
{
trip_init = trip_var;
trip_main = trip_var;
trip_back = trip_var;
}
stmt = gimple_build_assign (trip_init, build_int_cst (itype, 0));
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
t = fold_build2 (MULT_EXPR, itype, threadid, fd->chunk_size);
t = fold_build2 (MULT_EXPR, itype, t, fd->loop.step);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (fd->loop.n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, fd->loop.n1);
v_extra = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
true, GSI_SAME_STMT);
/* Remove the GIMPLE_OMP_FOR. */
gsi_remove (&si, true);
/* Iteration space partitioning goes in ITER_PART_BB. */
si = gsi_last_bb (iter_part_bb);
t = fold_build2 (MULT_EXPR, itype, trip_main, nthreads);
t = fold_build2 (PLUS_EXPR, itype, t, threadid);
t = fold_build2 (MULT_EXPR, itype, t, fd->chunk_size);
s0 = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
t = fold_build2 (PLUS_EXPR, itype, s0, fd->chunk_size);
t = fold_build2 (MIN_EXPR, itype, t, n);
e0 = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
t = build2 (LT_EXPR, boolean_type_node, s0, n);
gsi_insert_after (&si, gimple_build_cond_empty (t), GSI_CONTINUE_LINKING);
/* Setup code for sequential iteration goes in SEQ_START_BB. */
si = gsi_start_bb (seq_start_bb);
t = fold_convert (itype, s0);
t = fold_build2 (MULT_EXPR, itype, t, fd->loop.step);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (fd->loop.n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, fd->loop.n1);
t = force_gimple_operand_gsi (&si, t, false, NULL_TREE,
false, GSI_CONTINUE_LINKING);
stmt = gimple_build_assign (fd->loop.v, t);
gsi_insert_after (&si, stmt, GSI_CONTINUE_LINKING);
t = fold_convert (itype, e0);
t = fold_build2 (MULT_EXPR, itype, t, fd->loop.step);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (fd->loop.n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, fd->loop.n1);
e = force_gimple_operand_gsi (&si, t, true, NULL_TREE,
false, GSI_CONTINUE_LINKING);
/* The code controlling the sequential loop goes in CONT_BB,
replacing the GIMPLE_OMP_CONTINUE. */
si = gsi_last_bb (cont_bb);
stmt = gsi_stmt (si);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_CONTINUE);
v_main = gimple_omp_continue_control_use (stmt);
v_back = gimple_omp_continue_control_def (stmt);
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (v_main, fd->loop.step);
else
t = fold_build2 (PLUS_EXPR, type, v_main, fd->loop.step);
stmt = gimple_build_assign (v_back, t);
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
t = build2 (fd->loop.cond_code, boolean_type_node, v_back, e);
gsi_insert_before (&si, gimple_build_cond_empty (t), GSI_SAME_STMT);
/* Remove GIMPLE_OMP_CONTINUE. */
gsi_remove (&si, true);
/* Trip update code goes into TRIP_UPDATE_BB. */
si = gsi_start_bb (trip_update_bb);
t = build_int_cst (itype, 1);
t = build2 (PLUS_EXPR, itype, trip_main, t);
stmt = gimple_build_assign (trip_back, t);
gsi_insert_after (&si, stmt, GSI_CONTINUE_LINKING);
/* Replace the GIMPLE_OMP_RETURN with a barrier, or nothing. */
si = gsi_last_bb (exit_bb);
if (!gimple_omp_return_nowait_p (gsi_stmt (si)))
force_gimple_operand_gsi (&si, build_omp_barrier (), false, NULL_TREE,
false, GSI_SAME_STMT);
gsi_remove (&si, true);
/* Connect the new blocks. */
find_edge (iter_part_bb, seq_start_bb)->flags = EDGE_TRUE_VALUE;
find_edge (iter_part_bb, fin_bb)->flags = EDGE_FALSE_VALUE;
find_edge (cont_bb, body_bb)->flags = EDGE_TRUE_VALUE;
find_edge (cont_bb, trip_update_bb)->flags = EDGE_FALSE_VALUE;
redirect_edge_and_branch (single_succ_edge (trip_update_bb), iter_part_bb);
if (gimple_in_ssa_p (cfun))
{
gimple_stmt_iterator psi;
gimple phi;
edge re, ene;
edge_var_map_vector head;
edge_var_map *vm;
size_t i;
/* When we redirect the edge from trip_update_bb to iter_part_bb, we
remove arguments of the phi nodes in fin_bb. We need to create
appropriate phi nodes in iter_part_bb instead. */
se = single_pred_edge (fin_bb);
re = single_succ_edge (trip_update_bb);
head = redirect_edge_var_map_vector (re);
ene = single_succ_edge (entry_bb);
psi = gsi_start_phis (fin_bb);
for (i = 0; !gsi_end_p (psi) && VEC_iterate (edge_var_map, head, i, vm);
gsi_next (&psi), ++i)
{
gimple nphi;
source_location locus;
phi = gsi_stmt (psi);
t = gimple_phi_result (phi);
gcc_assert (t == redirect_edge_var_map_result (vm));
nphi = create_phi_node (t, iter_part_bb);
t = PHI_ARG_DEF_FROM_EDGE (phi, se);
locus = gimple_phi_arg_location_from_edge (phi, se);
/* A special case -- fd->loop.v is not yet computed in
iter_part_bb, we need to use v_extra instead. */
if (t == fd->loop.v)
t = v_extra;
add_phi_arg (nphi, t, ene, locus);
locus = redirect_edge_var_map_location (vm);
add_phi_arg (nphi, redirect_edge_var_map_def (vm), re, locus);
}
gcc_assert (!gsi_end_p (psi) && i == VEC_length (edge_var_map, head));
redirect_edge_var_map_clear (re);
while (1)
{
psi = gsi_start_phis (fin_bb);
if (gsi_end_p (psi))
break;
remove_phi_node (&psi, false);
}
/* Make phi node for trip. */
phi = create_phi_node (trip_main, iter_part_bb);
add_phi_arg (phi, trip_back, single_succ_edge (trip_update_bb),
UNKNOWN_LOCATION);
add_phi_arg (phi, trip_init, single_succ_edge (entry_bb),
UNKNOWN_LOCATION);
}
set_immediate_dominator (CDI_DOMINATORS, trip_update_bb, cont_bb);
set_immediate_dominator (CDI_DOMINATORS, iter_part_bb,
recompute_dominator (CDI_DOMINATORS, iter_part_bb));
set_immediate_dominator (CDI_DOMINATORS, fin_bb,
recompute_dominator (CDI_DOMINATORS, fin_bb));
set_immediate_dominator (CDI_DOMINATORS, seq_start_bb,
recompute_dominator (CDI_DOMINATORS, seq_start_bb));
set_immediate_dominator (CDI_DOMINATORS, body_bb,
recompute_dominator (CDI_DOMINATORS, body_bb));
}
/* Expand the OpenMP loop defined by REGION. */
static void
expand_omp_for (struct omp_region *region)
{
struct omp_for_data fd;
struct omp_for_data_loop *loops;
loops
= (struct omp_for_data_loop *)
alloca (gimple_omp_for_collapse (last_stmt (region->entry))
* sizeof (struct omp_for_data_loop));
extract_omp_for_data (last_stmt (region->entry), &fd, loops);
region->sched_kind = fd.sched_kind;
gcc_assert (EDGE_COUNT (region->entry->succs) == 2);
BRANCH_EDGE (region->entry)->flags &= ~EDGE_ABNORMAL;
FALLTHRU_EDGE (region->entry)->flags &= ~EDGE_ABNORMAL;
if (region->cont)
{
gcc_assert (EDGE_COUNT (region->cont->succs) == 2);
BRANCH_EDGE (region->cont)->flags &= ~EDGE_ABNORMAL;
FALLTHRU_EDGE (region->cont)->flags &= ~EDGE_ABNORMAL;
}
if (fd.sched_kind == OMP_CLAUSE_SCHEDULE_STATIC
&& !fd.have_ordered
&& fd.collapse == 1
&& region->cont != NULL)
{
if (fd.chunk_size == NULL)
expand_omp_for_static_nochunk (region, &fd);
else
expand_omp_for_static_chunk (region, &fd);
}
else
{
int fn_index, start_ix, next_ix;
if (fd.chunk_size == NULL
&& fd.sched_kind == OMP_CLAUSE_SCHEDULE_STATIC)
fd.chunk_size = integer_zero_node;
gcc_assert (fd.sched_kind != OMP_CLAUSE_SCHEDULE_AUTO);
fn_index = (fd.sched_kind == OMP_CLAUSE_SCHEDULE_RUNTIME)
? 3 : fd.sched_kind;
fn_index += fd.have_ordered * 4;
start_ix = ((int)BUILT_IN_GOMP_LOOP_STATIC_START) + fn_index;
next_ix = ((int)BUILT_IN_GOMP_LOOP_STATIC_NEXT) + fn_index;
if (fd.iter_type == long_long_unsigned_type_node)
{
start_ix += ((int)BUILT_IN_GOMP_LOOP_ULL_STATIC_START
- (int)BUILT_IN_GOMP_LOOP_STATIC_START);
next_ix += ((int)BUILT_IN_GOMP_LOOP_ULL_STATIC_NEXT
- (int)BUILT_IN_GOMP_LOOP_STATIC_NEXT);
}
expand_omp_for_generic (region, &fd, (enum built_in_function) start_ix,
(enum built_in_function) next_ix);
}
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_only_virtuals);
}
/* Expand code for an OpenMP sections directive. In pseudo code, we generate
v = GOMP_sections_start (n);
L0:
switch (v)
{
case 0:
goto L2;
case 1:
section 1;
goto L1;
case 2:
...
case n:
...
default:
abort ();
}
L1:
v = GOMP_sections_next ();
goto L0;
L2:
reduction;
If this is a combined parallel sections, replace the call to
GOMP_sections_start with call to GOMP_sections_next. */
static void
expand_omp_sections (struct omp_region *region)
{
tree t, u, vin = NULL, vmain, vnext, l2;
VEC (tree,heap) *label_vec;
unsigned len;
basic_block entry_bb, l0_bb, l1_bb, l2_bb, default_bb;
gimple_stmt_iterator si, switch_si;
gimple sections_stmt, stmt, cont;
edge_iterator ei;
edge e;
struct omp_region *inner;
unsigned i, casei;
bool exit_reachable = region->cont != NULL;
gcc_assert (region->exit != NULL);
entry_bb = region->entry;
l0_bb = single_succ (entry_bb);
l1_bb = region->cont;
l2_bb = region->exit;
if (single_pred_p (l2_bb) && single_pred (l2_bb) == l0_bb)
l2 = gimple_block_label (l2_bb);
else
{
/* This can happen if there are reductions. */
len = EDGE_COUNT (l0_bb->succs);
gcc_assert (len > 0);
e = EDGE_SUCC (l0_bb, len - 1);
si = gsi_last_bb (e->dest);
l2 = NULL_TREE;
if (gsi_end_p (si)
|| gimple_code (gsi_stmt (si)) != GIMPLE_OMP_SECTION)
l2 = gimple_block_label (e->dest);
else
FOR_EACH_EDGE (e, ei, l0_bb->succs)
{
si = gsi_last_bb (e->dest);
if (gsi_end_p (si)
|| gimple_code (gsi_stmt (si)) != GIMPLE_OMP_SECTION)
{
l2 = gimple_block_label (e->dest);
break;
}
}
}
if (exit_reachable)
default_bb = create_empty_bb (l1_bb->prev_bb);
else
default_bb = create_empty_bb (l0_bb);
/* We will build a switch() with enough cases for all the
GIMPLE_OMP_SECTION regions, a '0' case to handle the end of more work
and a default case to abort if something goes wrong. */
len = EDGE_COUNT (l0_bb->succs);
/* Use VEC_quick_push on label_vec throughout, since we know the size
in advance. */
label_vec = VEC_alloc (tree, heap, len);
/* The call to GOMP_sections_start goes in ENTRY_BB, replacing the
GIMPLE_OMP_SECTIONS statement. */
si = gsi_last_bb (entry_bb);
sections_stmt = gsi_stmt (si);
gcc_assert (gimple_code (sections_stmt) == GIMPLE_OMP_SECTIONS);
vin = gimple_omp_sections_control (sections_stmt);
if (!is_combined_parallel (region))
{
/* If we are not inside a combined parallel+sections region,
call GOMP_sections_start. */
t = build_int_cst (unsigned_type_node,
exit_reachable ? len - 1 : len);
u = builtin_decl_explicit (BUILT_IN_GOMP_SECTIONS_START);
stmt = gimple_build_call (u, 1, t);
}
else
{
/* Otherwise, call GOMP_sections_next. */
u = builtin_decl_explicit (BUILT_IN_GOMP_SECTIONS_NEXT);
stmt = gimple_build_call (u, 0);
}
gimple_call_set_lhs (stmt, vin);
gsi_insert_after (&si, stmt, GSI_SAME_STMT);
gsi_remove (&si, true);
/* The switch() statement replacing GIMPLE_OMP_SECTIONS_SWITCH goes in
L0_BB. */
switch_si = gsi_last_bb (l0_bb);
gcc_assert (gimple_code (gsi_stmt (switch_si)) == GIMPLE_OMP_SECTIONS_SWITCH);
if (exit_reachable)
{
cont = last_stmt (l1_bb);
gcc_assert (gimple_code (cont) == GIMPLE_OMP_CONTINUE);
vmain = gimple_omp_continue_control_use (cont);
vnext = gimple_omp_continue_control_def (cont);
}
else
{
vmain = vin;
vnext = NULL_TREE;
}
t = build_case_label (build_int_cst (unsigned_type_node, 0), NULL, l2);
VEC_quick_push (tree, label_vec, t);
i = 1;
/* Convert each GIMPLE_OMP_SECTION into a CASE_LABEL_EXPR. */
for (inner = region->inner, casei = 1;
inner;
inner = inner->next, i++, casei++)
{
basic_block s_entry_bb, s_exit_bb;
/* Skip optional reduction region. */
if (inner->type == GIMPLE_OMP_ATOMIC_LOAD)
{
--i;
--casei;
continue;
}
s_entry_bb = inner->entry;
s_exit_bb = inner->exit;
t = gimple_block_label (s_entry_bb);
u = build_int_cst (unsigned_type_node, casei);
u = build_case_label (u, NULL, t);
VEC_quick_push (tree, label_vec, u);
si = gsi_last_bb (s_entry_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_SECTION);
gcc_assert (i < len || gimple_omp_section_last_p (gsi_stmt (si)));
gsi_remove (&si, true);
single_succ_edge (s_entry_bb)->flags = EDGE_FALLTHRU;
if (s_exit_bb == NULL)
continue;
si = gsi_last_bb (s_exit_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_RETURN);
gsi_remove (&si, true);
single_succ_edge (s_exit_bb)->flags = EDGE_FALLTHRU;
}
/* Error handling code goes in DEFAULT_BB. */
t = gimple_block_label (default_bb);
u = build_case_label (NULL, NULL, t);
make_edge (l0_bb, default_bb, 0);
stmt = gimple_build_switch (vmain, u, label_vec);
gsi_insert_after (&switch_si, stmt, GSI_SAME_STMT);
gsi_remove (&switch_si, true);
VEC_free (tree, heap, label_vec);
si = gsi_start_bb (default_bb);
stmt = gimple_build_call (builtin_decl_explicit (BUILT_IN_TRAP), 0);
gsi_insert_after (&si, stmt, GSI_CONTINUE_LINKING);
if (exit_reachable)
{
tree bfn_decl;
/* Code to get the next section goes in L1_BB. */
si = gsi_last_bb (l1_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_CONTINUE);
bfn_decl = builtin_decl_explicit (BUILT_IN_GOMP_SECTIONS_NEXT);
stmt = gimple_build_call (bfn_decl, 0);
gimple_call_set_lhs (stmt, vnext);
gsi_insert_after (&si, stmt, GSI_SAME_STMT);
gsi_remove (&si, true);
single_succ_edge (l1_bb)->flags = EDGE_FALLTHRU;
}
/* Cleanup function replaces GIMPLE_OMP_RETURN in EXIT_BB. */
si = gsi_last_bb (l2_bb);
if (gimple_omp_return_nowait_p (gsi_stmt (si)))
t = builtin_decl_explicit (BUILT_IN_GOMP_SECTIONS_END_NOWAIT);
else
t = builtin_decl_explicit (BUILT_IN_GOMP_SECTIONS_END);
stmt = gimple_build_call (t, 0);
gsi_insert_after (&si, stmt, GSI_SAME_STMT);
gsi_remove (&si, true);
set_immediate_dominator (CDI_DOMINATORS, default_bb, l0_bb);
}
/* Expand code for an OpenMP single directive. We've already expanded
much of the code, here we simply place the GOMP_barrier call. */
static void
expand_omp_single (struct omp_region *region)
{
basic_block entry_bb, exit_bb;
gimple_stmt_iterator si;
bool need_barrier = false;
entry_bb = region->entry;
exit_bb = region->exit;
si = gsi_last_bb (entry_bb);
/* The terminal barrier at the end of a GOMP_single_copy sequence cannot
be removed. We need to ensure that the thread that entered the single
does not exit before the data is copied out by the other threads. */
if (find_omp_clause (gimple_omp_single_clauses (gsi_stmt (si)),
OMP_CLAUSE_COPYPRIVATE))
need_barrier = true;
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_SINGLE);
gsi_remove (&si, true);
single_succ_edge (entry_bb)->flags = EDGE_FALLTHRU;
si = gsi_last_bb (exit_bb);
if (!gimple_omp_return_nowait_p (gsi_stmt (si)) || need_barrier)
force_gimple_operand_gsi (&si, build_omp_barrier (), false, NULL_TREE,
false, GSI_SAME_STMT);
gsi_remove (&si, true);
single_succ_edge (exit_bb)->flags = EDGE_FALLTHRU;
}
/* Generic expansion for OpenMP synchronization directives: master,
ordered and critical. All we need to do here is remove the entry
and exit markers for REGION. */
static void
expand_omp_synch (struct omp_region *region)
{
basic_block entry_bb, exit_bb;
gimple_stmt_iterator si;
entry_bb = region->entry;
exit_bb = region->exit;
si = gsi_last_bb (entry_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_SINGLE
|| gimple_code (gsi_stmt (si)) == GIMPLE_OMP_MASTER
|| gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ORDERED
|| gimple_code (gsi_stmt (si)) == GIMPLE_OMP_CRITICAL);
gsi_remove (&si, true);
single_succ_edge (entry_bb)->flags = EDGE_FALLTHRU;
if (exit_bb)
{
si = gsi_last_bb (exit_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_RETURN);
gsi_remove (&si, true);
single_succ_edge (exit_bb)->flags = EDGE_FALLTHRU;
}
}
/* A subroutine of expand_omp_atomic. Attempt to implement the atomic
operation as a normal volatile load. */
static bool
expand_omp_atomic_load (basic_block load_bb, tree addr,
tree loaded_val, int index)
{
enum built_in_function tmpbase;
gimple_stmt_iterator gsi;
basic_block store_bb;
location_t loc;
gimple stmt;
tree decl, call, type, itype;
gsi = gsi_last_bb (load_bb);
stmt = gsi_stmt (gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_ATOMIC_LOAD);
loc = gimple_location (stmt);
/* ??? If the target does not implement atomic_load_optab[mode], and mode
is smaller than word size, then expand_atomic_load assumes that the load
is atomic. We could avoid the builtin entirely in this case. */
tmpbase = (enum built_in_function) (BUILT_IN_ATOMIC_LOAD_N + index + 1);
decl = builtin_decl_explicit (tmpbase);
if (decl == NULL_TREE)
return false;
type = TREE_TYPE (loaded_val);
itype = TREE_TYPE (TREE_TYPE (decl));
call = build_call_expr_loc (loc, decl, 2, addr,
build_int_cst (NULL, MEMMODEL_RELAXED));
if (!useless_type_conversion_p (type, itype))
call = fold_build1_loc (loc, VIEW_CONVERT_EXPR, type, call);
call = build2_loc (loc, MODIFY_EXPR, void_type_node, loaded_val, call);
force_gimple_operand_gsi (&gsi, call, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&gsi, true);
store_bb = single_succ (load_bb);
gsi = gsi_last_bb (store_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_ATOMIC_STORE);
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
/* A subroutine of expand_omp_atomic. Attempt to implement the atomic
operation as a normal volatile store. */
static bool
expand_omp_atomic_store (basic_block load_bb, tree addr,
tree loaded_val, tree stored_val, int index)
{
enum built_in_function tmpbase;
gimple_stmt_iterator gsi;
basic_block store_bb = single_succ (load_bb);
location_t loc;
gimple stmt;
tree decl, call, type, itype;
enum machine_mode imode;
bool exchange;
gsi = gsi_last_bb (load_bb);
stmt = gsi_stmt (gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_ATOMIC_LOAD);
/* If the load value is needed, then this isn't a store but an exchange. */
exchange = gimple_omp_atomic_need_value_p (stmt);
gsi = gsi_last_bb (store_bb);
stmt = gsi_stmt (gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_OMP_ATOMIC_STORE);
loc = gimple_location (stmt);
/* ??? If the target does not implement atomic_store_optab[mode], and mode
is smaller than word size, then expand_atomic_store assumes that the store
is atomic. We could avoid the builtin entirely in this case. */
tmpbase = (exchange ? BUILT_IN_ATOMIC_EXCHANGE_N : BUILT_IN_ATOMIC_STORE_N);
tmpbase = (enum built_in_function) ((int) tmpbase + index + 1);
decl = builtin_decl_explicit (tmpbase);
if (decl == NULL_TREE)
return false;
type = TREE_TYPE (stored_val);
/* Dig out the type of the function's second argument. */
itype = TREE_TYPE (decl);
itype = TYPE_ARG_TYPES (itype);
itype = TREE_CHAIN (itype);
itype = TREE_VALUE (itype);
imode = TYPE_MODE (itype);
if (exchange && !can_atomic_exchange_p (imode, true))
return false;
if (!useless_type_conversion_p (itype, type))
stored_val = fold_build1_loc (loc, VIEW_CONVERT_EXPR, itype, stored_val);
call = build_call_expr_loc (loc, decl, 3, addr, stored_val,
build_int_cst (NULL, MEMMODEL_RELAXED));
if (exchange)
{
if (!useless_type_conversion_p (type, itype))
call = build1_loc (loc, VIEW_CONVERT_EXPR, type, call);
call = build2_loc (loc, MODIFY_EXPR, void_type_node, loaded_val, call);
}
force_gimple_operand_gsi (&gsi, call, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&gsi, true);
/* Remove the GIMPLE_OMP_ATOMIC_LOAD that we verified above. */
gsi = gsi_last_bb (load_bb);
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
/* A subroutine of expand_omp_atomic. Attempt to implement the atomic
operation as a __atomic_fetch_op builtin. INDEX is log2 of the
size of the data type, and thus usable to find the index of the builtin
decl. Returns false if the expression is not of the proper form. */
static bool
expand_omp_atomic_fetch_op (basic_block load_bb,
tree addr, tree loaded_val,
tree stored_val, int index)
{
enum built_in_function oldbase, newbase, tmpbase;
tree decl, itype, call;
tree lhs, rhs;
basic_block store_bb = single_succ (load_bb);
gimple_stmt_iterator gsi;
gimple stmt;
location_t loc;
enum tree_code code;
bool need_old, need_new;
enum machine_mode imode;
/* We expect to find the following sequences:
load_bb:
GIMPLE_OMP_ATOMIC_LOAD (tmp, mem)
store_bb:
val = tmp OP something; (or: something OP tmp)
GIMPLE_OMP_STORE (val)
???FIXME: Allow a more flexible sequence.
Perhaps use data flow to pick the statements.
*/
gsi = gsi_after_labels (store_bb);
stmt = gsi_stmt (gsi);
loc = gimple_location (stmt);
if (!is_gimple_assign (stmt))
return false;
gsi_next (&gsi);
if (gimple_code (gsi_stmt (gsi)) != GIMPLE_OMP_ATOMIC_STORE)
return false;
need_new = gimple_omp_atomic_need_value_p (gsi_stmt (gsi));
need_old = gimple_omp_atomic_need_value_p (last_stmt (load_bb));
gcc_checking_assert (!need_old || !need_new);
if (!operand_equal_p (gimple_assign_lhs (stmt), stored_val, 0))
return false;
/* Check for one of the supported fetch-op operations. */
code = gimple_assign_rhs_code (stmt);
switch (code)
{
case PLUS_EXPR:
case POINTER_PLUS_EXPR:
oldbase = BUILT_IN_ATOMIC_FETCH_ADD_N;
newbase = BUILT_IN_ATOMIC_ADD_FETCH_N;
break;
case MINUS_EXPR:
oldbase = BUILT_IN_ATOMIC_FETCH_SUB_N;
newbase = BUILT_IN_ATOMIC_SUB_FETCH_N;
break;
case BIT_AND_EXPR:
oldbase = BUILT_IN_ATOMIC_FETCH_AND_N;
newbase = BUILT_IN_ATOMIC_AND_FETCH_N;
break;
case BIT_IOR_EXPR:
oldbase = BUILT_IN_ATOMIC_FETCH_OR_N;
newbase = BUILT_IN_ATOMIC_OR_FETCH_N;
break;
case BIT_XOR_EXPR:
oldbase = BUILT_IN_ATOMIC_FETCH_XOR_N;
newbase = BUILT_IN_ATOMIC_XOR_FETCH_N;
break;
default:
return false;
}
/* Make sure the expression is of the proper form. */
if (operand_equal_p (gimple_assign_rhs1 (stmt), loaded_val, 0))
rhs = gimple_assign_rhs2 (stmt);
else if (commutative_tree_code (gimple_assign_rhs_code (stmt))
&& operand_equal_p (gimple_assign_rhs2 (stmt), loaded_val, 0))
rhs = gimple_assign_rhs1 (stmt);
else
return false;
tmpbase = ((enum built_in_function)
((need_new ? newbase : oldbase) + index + 1));
decl = builtin_decl_explicit (tmpbase);
if (decl == NULL_TREE)
return false;
itype = TREE_TYPE (TREE_TYPE (decl));
imode = TYPE_MODE (itype);
/* We could test all of the various optabs involved, but the fact of the
matter is that (with the exception of i486 vs i586 and xadd) all targets
that support any atomic operaton optab also implements compare-and-swap.
Let optabs.c take care of expanding any compare-and-swap loop. */
if (!can_compare_and_swap_p (imode, true))
return false;
gsi = gsi_last_bb (load_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_ATOMIC_LOAD);
/* OpenMP does not imply any barrier-like semantics on its atomic ops.
It only requires that the operation happen atomically. Thus we can
use the RELAXED memory model. */
call = build_call_expr_loc (loc, decl, 3, addr,
fold_convert_loc (loc, itype, rhs),
build_int_cst (NULL, MEMMODEL_RELAXED));
if (need_old || need_new)
{
lhs = need_old ? loaded_val : stored_val;
call = fold_convert_loc (loc, TREE_TYPE (lhs), call);
call = build2_loc (loc, MODIFY_EXPR, void_type_node, lhs, call);
}
else
call = fold_convert_loc (loc, void_type_node, call);
force_gimple_operand_gsi (&gsi, call, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&gsi, true);
gsi = gsi_last_bb (store_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_ATOMIC_STORE);
gsi_remove (&gsi, true);
gsi = gsi_last_bb (store_bb);
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
/* A subroutine of expand_omp_atomic. Implement the atomic operation as:
oldval = *addr;
repeat:
newval = rhs; // with oldval replacing *addr in rhs
oldval = __sync_val_compare_and_swap (addr, oldval, newval);
if (oldval != newval)
goto repeat;
INDEX is log2 of the size of the data type, and thus usable to find the
index of the builtin decl. */
static bool
expand_omp_atomic_pipeline (basic_block load_bb, basic_block store_bb,
tree addr, tree loaded_val, tree stored_val,
int index)
{
tree loadedi, storedi, initial, new_storedi, old_vali;
tree type, itype, cmpxchg, iaddr;
gimple_stmt_iterator si;
basic_block loop_header = single_succ (load_bb);
gimple phi, stmt;
edge e;
enum built_in_function fncode;
/* ??? We need a non-pointer interface to __atomic_compare_exchange in
order to use the RELAXED memory model effectively. */
fncode = (enum built_in_function)((int)BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_N
+ index + 1);
cmpxchg = builtin_decl_explicit (fncode);
if (cmpxchg == NULL_TREE)
return false;
type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr)));
itype = TREE_TYPE (TREE_TYPE (cmpxchg));
if (!can_compare_and_swap_p (TYPE_MODE (itype), true))
return false;
/* Load the initial value, replacing the GIMPLE_OMP_ATOMIC_LOAD. */
si = gsi_last_bb (load_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ATOMIC_LOAD);
/* For floating-point values, we'll need to view-convert them to integers
so that we can perform the atomic compare and swap. Simplify the
following code by always setting up the "i"ntegral variables. */
if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
{
tree iaddr_val;
iaddr = create_tmp_reg (build_pointer_type_for_mode (itype, ptr_mode,
true), NULL);
iaddr_val
= force_gimple_operand_gsi (&si,
fold_convert (TREE_TYPE (iaddr), addr),
false, NULL_TREE, true, GSI_SAME_STMT);
stmt = gimple_build_assign (iaddr, iaddr_val);
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
loadedi = create_tmp_var (itype, NULL);
if (gimple_in_ssa_p (cfun))
loadedi = make_ssa_name (loadedi, NULL);
}
else
{
iaddr = addr;
loadedi = loaded_val;
}
initial
= force_gimple_operand_gsi (&si,
build2 (MEM_REF, TREE_TYPE (TREE_TYPE (iaddr)),
iaddr,
build_int_cst (TREE_TYPE (iaddr), 0)),
true, NULL_TREE, true, GSI_SAME_STMT);
/* Move the value to the LOADEDI temporary. */
if (gimple_in_ssa_p (cfun))
{
gcc_assert (gimple_seq_empty_p (phi_nodes (loop_header)));
phi = create_phi_node (loadedi, loop_header);
SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE (phi, single_succ_edge (load_bb)),
initial);
}
else
gsi_insert_before (&si,
gimple_build_assign (loadedi, initial),
GSI_SAME_STMT);
if (loadedi != loaded_val)
{
gimple_stmt_iterator gsi2;
tree x;
x = build1 (VIEW_CONVERT_EXPR, type, loadedi);
gsi2 = gsi_start_bb (loop_header);
if (gimple_in_ssa_p (cfun))
{
gimple stmt;
x = force_gimple_operand_gsi (&gsi2, x, true, NULL_TREE,
true, GSI_SAME_STMT);
stmt = gimple_build_assign (loaded_val, x);
gsi_insert_before (&gsi2, stmt, GSI_SAME_STMT);
}
else
{
x = build2 (MODIFY_EXPR, TREE_TYPE (loaded_val), loaded_val, x);
force_gimple_operand_gsi (&gsi2, x, true, NULL_TREE,
true, GSI_SAME_STMT);
}
}
gsi_remove (&si, true);
si = gsi_last_bb (store_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ATOMIC_STORE);
if (iaddr == addr)
storedi = stored_val;
else
storedi =
force_gimple_operand_gsi (&si,
build1 (VIEW_CONVERT_EXPR, itype,
stored_val), true, NULL_TREE, true,
GSI_SAME_STMT);
/* Build the compare&swap statement. */
new_storedi = build_call_expr (cmpxchg, 3, iaddr, loadedi, storedi);
new_storedi = force_gimple_operand_gsi (&si,
fold_convert (TREE_TYPE (loadedi),
new_storedi),
true, NULL_TREE,
true, GSI_SAME_STMT);
if (gimple_in_ssa_p (cfun))
old_vali = loadedi;
else
{
old_vali = create_tmp_var (TREE_TYPE (loadedi), NULL);
stmt = gimple_build_assign (old_vali, loadedi);
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
stmt = gimple_build_assign (loadedi, new_storedi);
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
}
/* Note that we always perform the comparison as an integer, even for
floating point. This allows the atomic operation to properly
succeed even with NaNs and -0.0. */
stmt = gimple_build_cond_empty
(build2 (NE_EXPR, boolean_type_node,
new_storedi, old_vali));
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
/* Update cfg. */
e = single_succ_edge (store_bb);
e->flags &= ~EDGE_FALLTHRU;
e->flags |= EDGE_FALSE_VALUE;
e = make_edge (store_bb, loop_header, EDGE_TRUE_VALUE);
/* Copy the new value to loadedi (we already did that before the condition
if we are not in SSA). */
if (gimple_in_ssa_p (cfun))
{
phi = gimple_seq_first_stmt (phi_nodes (loop_header));
SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE (phi, e), new_storedi);
}
/* Remove GIMPLE_OMP_ATOMIC_STORE. */
gsi_remove (&si, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
/* A subroutine of expand_omp_atomic. Implement the atomic operation as:
GOMP_atomic_start ();
*addr = rhs;
GOMP_atomic_end ();
The result is not globally atomic, but works so long as all parallel
references are within #pragma omp atomic directives. According to
responses received from omp@openmp.org, appears to be within spec.
Which makes sense, since that's how several other compilers handle
this situation as well.
LOADED_VAL and ADDR are the operands of GIMPLE_OMP_ATOMIC_LOAD we're
expanding. STORED_VAL is the operand of the matching
GIMPLE_OMP_ATOMIC_STORE.
We replace
GIMPLE_OMP_ATOMIC_LOAD (loaded_val, addr) with
loaded_val = *addr;
and replace
GIMPLE_OMP_ATOMIC_STORE (stored_val) with
*addr = stored_val;
*/
static bool
expand_omp_atomic_mutex (basic_block load_bb, basic_block store_bb,
tree addr, tree loaded_val, tree stored_val)
{
gimple_stmt_iterator si;
gimple stmt;
tree t;
si = gsi_last_bb (load_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ATOMIC_LOAD);
t = builtin_decl_explicit (BUILT_IN_GOMP_ATOMIC_START);
t = build_call_expr (t, 0);
force_gimple_operand_gsi (&si, t, true, NULL_TREE, true, GSI_SAME_STMT);
stmt = gimple_build_assign (loaded_val, build_simple_mem_ref (addr));
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
gsi_remove (&si, true);
si = gsi_last_bb (store_bb);
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ATOMIC_STORE);
stmt = gimple_build_assign (build_simple_mem_ref (unshare_expr (addr)),
stored_val);
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
t = builtin_decl_explicit (BUILT_IN_GOMP_ATOMIC_END);
t = build_call_expr (t, 0);
force_gimple_operand_gsi (&si, t, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&si, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
/* Expand an GIMPLE_OMP_ATOMIC statement. We try to expand
using expand_omp_atomic_fetch_op. If it failed, we try to
call expand_omp_atomic_pipeline, and if it fails too, the
ultimate fallback is wrapping the operation in a mutex
(expand_omp_atomic_mutex). REGION is the atomic region built
by build_omp_regions_1(). */
static void
expand_omp_atomic (struct omp_region *region)
{
basic_block load_bb = region->entry, store_bb = region->exit;
gimple load = last_stmt (load_bb), store = last_stmt (store_bb);
tree loaded_val = gimple_omp_atomic_load_lhs (load);
tree addr = gimple_omp_atomic_load_rhs (load);
tree stored_val = gimple_omp_atomic_store_val (store);
tree type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr)));
HOST_WIDE_INT index;
/* Make sure the type is one of the supported sizes. */
index = tree_low_cst (TYPE_SIZE_UNIT (type), 1);
index = exact_log2 (index);
if (index >= 0 && index <= 4)
{
unsigned int align = TYPE_ALIGN_UNIT (type);
/* __sync builtins require strict data alignment. */
if (exact_log2 (align) >= index)
{
/* Atomic load. */
if (loaded_val == stored_val
&& (GET_MODE_CLASS (TYPE_MODE (type)) == MODE_INT
|| GET_MODE_CLASS (TYPE_MODE (type)) == MODE_FLOAT)
&& GET_MODE_BITSIZE (TYPE_MODE (type)) <= BITS_PER_WORD
&& expand_omp_atomic_load (load_bb, addr, loaded_val, index))
return;
/* Atomic store. */
if ((GET_MODE_CLASS (TYPE_MODE (type)) == MODE_INT
|| GET_MODE_CLASS (TYPE_MODE (type)) == MODE_FLOAT)
&& GET_MODE_BITSIZE (TYPE_MODE (type)) <= BITS_PER_WORD
&& store_bb == single_succ (load_bb)
&& first_stmt (store_bb) == store
&& expand_omp_atomic_store (load_bb, addr, loaded_val,
stored_val, index))
return;
/* When possible, use specialized atomic update functions. */
if ((INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
&& store_bb == single_succ (load_bb)
&& expand_omp_atomic_fetch_op (load_bb, addr,
loaded_val, stored_val, index))
return;
/* If we don't have specialized __sync builtins, try and implement
as a compare and swap loop. */
if (expand_omp_atomic_pipeline (load_bb, store_bb, addr,
loaded_val, stored_val, index))
return;
}
}
/* The ultimate fallback is wrapping the operation in a mutex. */
expand_omp_atomic_mutex (load_bb, store_bb, addr, loaded_val, stored_val);
}
/* Expand the parallel region tree rooted at REGION. Expansion
proceeds in depth-first order. Innermost regions are expanded
first. This way, parallel regions that require a new function to
be created (e.g., GIMPLE_OMP_PARALLEL) can be expanded without having any
internal dependencies in their body. */
static void
expand_omp (struct omp_region *region)
{
while (region)
{
location_t saved_location;
/* First, determine whether this is a combined parallel+workshare
region. */
if (region->type == GIMPLE_OMP_PARALLEL)
determine_parallel_type (region);
if (region->inner)
expand_omp (region->inner);
saved_location = input_location;
if (gimple_has_location (last_stmt (region->entry)))
input_location = gimple_location (last_stmt (region->entry));
switch (region->type)
{
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
expand_omp_taskreg (region);
break;
case GIMPLE_OMP_FOR:
expand_omp_for (region);
break;
case GIMPLE_OMP_SECTIONS:
expand_omp_sections (region);
break;
case GIMPLE_OMP_SECTION:
/* Individual omp sections are handled together with their
parent GIMPLE_OMP_SECTIONS region. */
break;
case GIMPLE_OMP_SINGLE:
expand_omp_single (region);
break;
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
expand_omp_synch (region);
break;
case GIMPLE_OMP_ATOMIC_LOAD:
expand_omp_atomic (region);
break;
default:
gcc_unreachable ();
}
input_location = saved_location;
region = region->next;
}
}
/* Helper for build_omp_regions. Scan the dominator tree starting at
block BB. PARENT is the region that contains BB. If SINGLE_TREE is
true, the function ends once a single tree is built (otherwise, whole
forest of OMP constructs may be built). */
static void
build_omp_regions_1 (basic_block bb, struct omp_region *parent,
bool single_tree)
{
gimple_stmt_iterator gsi;
gimple stmt;
basic_block son;
gsi = gsi_last_bb (bb);
if (!gsi_end_p (gsi) && is_gimple_omp (gsi_stmt (gsi)))
{
struct omp_region *region;
enum gimple_code code;
stmt = gsi_stmt (gsi);
code = gimple_code (stmt);
if (code == GIMPLE_OMP_RETURN)
{
/* STMT is the return point out of region PARENT. Mark it
as the exit point and make PARENT the immediately
enclosing region. */
gcc_assert (parent);
region = parent;
region->exit = bb;
parent = parent->outer;
}
else if (code == GIMPLE_OMP_ATOMIC_STORE)
{
/* GIMPLE_OMP_ATOMIC_STORE is analoguous to
GIMPLE_OMP_RETURN, but matches with
GIMPLE_OMP_ATOMIC_LOAD. */
gcc_assert (parent);
gcc_assert (parent->type == GIMPLE_OMP_ATOMIC_LOAD);
region = parent;
region->exit = bb;
parent = parent->outer;
}
else if (code == GIMPLE_OMP_CONTINUE)
{
gcc_assert (parent);
parent->cont = bb;
}
else if (code == GIMPLE_OMP_SECTIONS_SWITCH)
{
/* GIMPLE_OMP_SECTIONS_SWITCH is part of
GIMPLE_OMP_SECTIONS, and we do nothing for it. */
;
}
else
{
/* Otherwise, this directive becomes the parent for a new
region. */
region = new_omp_region (bb, code, parent);
parent = region;
}
}
if (single_tree && !parent)
return;
for (son = first_dom_son (CDI_DOMINATORS, bb);
son;
son = next_dom_son (CDI_DOMINATORS, son))
build_omp_regions_1 (son, parent, single_tree);
}
/* Builds the tree of OMP regions rooted at ROOT, storing it to
root_omp_region. */
static void
build_omp_regions_root (basic_block root)
{
gcc_assert (root_omp_region == NULL);
build_omp_regions_1 (root, NULL, true);
gcc_assert (root_omp_region != NULL);
}
/* Expands omp construct (and its subconstructs) starting in HEAD. */
void
omp_expand_local (basic_block head)
{
build_omp_regions_root (head);
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "\nOMP region tree\n\n");
dump_omp_region (dump_file, root_omp_region, 0);
fprintf (dump_file, "\n");
}
remove_exit_barriers (root_omp_region);
expand_omp (root_omp_region);
free_omp_regions ();
}
/* Scan the CFG and build a tree of OMP regions. Return the root of
the OMP region tree. */
static void
build_omp_regions (void)
{
gcc_assert (root_omp_region == NULL);
calculate_dominance_info (CDI_DOMINATORS);
build_omp_regions_1 (ENTRY_BLOCK_PTR, NULL, false);
}
/* Main entry point for expanding OMP-GIMPLE into runtime calls. */
static unsigned int
execute_expand_omp (void)
{
build_omp_regions ();
if (!root_omp_region)
return 0;
if (dump_file)
{
fprintf (dump_file, "\nOMP region tree\n\n");
dump_omp_region (dump_file, root_omp_region, 0);
fprintf (dump_file, "\n");
}
remove_exit_barriers (root_omp_region);
expand_omp (root_omp_region);
cleanup_tree_cfg ();
free_omp_regions ();
return 0;
}
/* OMP expansion -- the default pass, run before creation of SSA form. */
static bool
gate_expand_omp (void)
{
return (flag_openmp != 0 && !seen_error ());
}
struct gimple_opt_pass pass_expand_omp =
{
{
GIMPLE_PASS,
"ompexp", /* name */
gate_expand_omp, /* gate */
execute_expand_omp, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_NONE, /* tv_id */
PROP_gimple_any, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* Routines to lower OpenMP directives into OMP-GIMPLE. */
/* Lower the OpenMP sections directive in the current statement in GSI_P.
CTX is the enclosing OMP context for the current statement. */
static void
lower_omp_sections (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree block, control;
gimple_stmt_iterator tgsi;
gimple stmt, new_stmt, bind, t;
gimple_seq ilist, dlist, olist, new_body;
struct gimplify_ctx gctx;
stmt = gsi_stmt (*gsi_p);
push_gimplify_context (&gctx);
dlist = NULL;
ilist = NULL;
lower_rec_input_clauses (gimple_omp_sections_clauses (stmt),
&ilist, &dlist, ctx);
new_body = gimple_omp_body (stmt);
gimple_omp_set_body (stmt, NULL);
tgsi = gsi_start (new_body);
for (; !gsi_end_p (tgsi); gsi_next (&tgsi))
{
omp_context *sctx;
gimple sec_start;
sec_start = gsi_stmt (tgsi);
sctx = maybe_lookup_ctx (sec_start);
gcc_assert (sctx);
lower_omp (gimple_omp_body_ptr (sec_start), sctx);
gsi_insert_seq_after (&tgsi, gimple_omp_body (sec_start),
GSI_CONTINUE_LINKING);
gimple_omp_set_body (sec_start, NULL);
if (gsi_one_before_end_p (tgsi))
{
gimple_seq l = NULL;
lower_lastprivate_clauses (gimple_omp_sections_clauses (stmt), NULL,
&l, ctx);
gsi_insert_seq_after (&tgsi, l, GSI_CONTINUE_LINKING);
gimple_omp_section_set_last (sec_start);
}
gsi_insert_after (&tgsi, gimple_build_omp_return (false),
GSI_CONTINUE_LINKING);
}
block = make_node (BLOCK);
bind = gimple_build_bind (NULL, new_body, block);
olist = NULL;
lower_reduction_clauses (gimple_omp_sections_clauses (stmt), &olist, ctx);
block = make_node (BLOCK);
new_stmt = gimple_build_bind (NULL, NULL, block);
gsi_replace (gsi_p, new_stmt, true);
pop_gimplify_context (new_stmt);
gimple_bind_append_vars (new_stmt, ctx->block_vars);
BLOCK_VARS (block) = gimple_bind_vars (bind);
if (BLOCK_VARS (block))
TREE_USED (block) = 1;
new_body = NULL;
gimple_seq_add_seq (&new_body, ilist);
gimple_seq_add_stmt (&new_body, stmt);
gimple_seq_add_stmt (&new_body, gimple_build_omp_sections_switch ());
gimple_seq_add_stmt (&new_body, bind);
control = create_tmp_var (unsigned_type_node, ".section");
t = gimple_build_omp_continue (control, control);
gimple_omp_sections_set_control (stmt, control);
gimple_seq_add_stmt (&new_body, t);
gimple_seq_add_seq (&new_body, olist);
gimple_seq_add_seq (&new_body, dlist);
new_body = maybe_catch_exception (new_body);
t = gimple_build_omp_return
(!!find_omp_clause (gimple_omp_sections_clauses (stmt),
OMP_CLAUSE_NOWAIT));
gimple_seq_add_stmt (&new_body, t);
gimple_bind_set_body (new_stmt, new_body);
}
/* A subroutine of lower_omp_single. Expand the simple form of
a GIMPLE_OMP_SINGLE, without a copyprivate clause:
if (GOMP_single_start ())
BODY;
[ GOMP_barrier (); ] -> unless 'nowait' is present.
FIXME. It may be better to delay expanding the logic of this until
pass_expand_omp. The expanded logic may make the job more difficult
to a synchronization analysis pass. */
static void
lower_omp_single_simple (gimple single_stmt, gimple_seq *pre_p)
{
location_t loc = gimple_location (single_stmt);
tree tlabel = create_artificial_label (loc);
tree flabel = create_artificial_label (loc);
gimple call, cond;
tree lhs, decl;
decl = builtin_decl_explicit (BUILT_IN_GOMP_SINGLE_START);
lhs = create_tmp_var (TREE_TYPE (TREE_TYPE (decl)), NULL);
call = gimple_build_call (decl, 0);
gimple_call_set_lhs (call, lhs);
gimple_seq_add_stmt (pre_p, call);
cond = gimple_build_cond (EQ_EXPR, lhs,
fold_convert_loc (loc, TREE_TYPE (lhs),
boolean_true_node),
tlabel, flabel);
gimple_seq_add_stmt (pre_p, cond);
gimple_seq_add_stmt (pre_p, gimple_build_label (tlabel));
gimple_seq_add_seq (pre_p, gimple_omp_body (single_stmt));
gimple_seq_add_stmt (pre_p, gimple_build_label (flabel));
}
/* A subroutine of lower_omp_single. Expand the simple form of
a GIMPLE_OMP_SINGLE, with a copyprivate clause:
#pragma omp single copyprivate (a, b, c)
Create a new structure to hold copies of 'a', 'b' and 'c' and emit:
{
if ((copyout_p = GOMP_single_copy_start ()) == NULL)
{
BODY;
copyout.a = a;
copyout.b = b;
copyout.c = c;
GOMP_single_copy_end (&copyout);
}
else
{
a = copyout_p->a;
b = copyout_p->b;
c = copyout_p->c;
}
GOMP_barrier ();
}
FIXME. It may be better to delay expanding the logic of this until
pass_expand_omp. The expanded logic may make the job more difficult
to a synchronization analysis pass. */
static void
lower_omp_single_copy (gimple single_stmt, gimple_seq *pre_p, omp_context *ctx)
{
tree ptr_type, t, l0, l1, l2, bfn_decl;
gimple_seq copyin_seq;
location_t loc = gimple_location (single_stmt);
ctx->sender_decl = create_tmp_var (ctx->record_type, ".omp_copy_o");
ptr_type = build_pointer_type (ctx->record_type);
ctx->receiver_decl = create_tmp_var (ptr_type, ".omp_copy_i");
l0 = create_artificial_label (loc);
l1 = create_artificial_label (loc);
l2 = create_artificial_label (loc);
bfn_decl = builtin_decl_explicit (BUILT_IN_GOMP_SINGLE_COPY_START);
t = build_call_expr_loc (loc, bfn_decl, 0);
t = fold_convert_loc (loc, ptr_type, t);
gimplify_assign (ctx->receiver_decl, t, pre_p);
t = build2 (EQ_EXPR, boolean_type_node, ctx->receiver_decl,
build_int_cst (ptr_type, 0));
t = build3 (COND_EXPR, void_type_node, t,
build_and_jump (&l0), build_and_jump (&l1));
gimplify_and_add (t, pre_p);
gimple_seq_add_stmt (pre_p, gimple_build_label (l0));
gimple_seq_add_seq (pre_p, gimple_omp_body (single_stmt));
copyin_seq = NULL;
lower_copyprivate_clauses (gimple_omp_single_clauses (single_stmt), pre_p,
&copyin_seq, ctx);
t = build_fold_addr_expr_loc (loc, ctx->sender_decl);
bfn_decl = builtin_decl_explicit (BUILT_IN_GOMP_SINGLE_COPY_END);
t = build_call_expr_loc (loc, bfn_decl, 1, t);
gimplify_and_add (t, pre_p);
t = build_and_jump (&l2);
gimplify_and_add (t, pre_p);
gimple_seq_add_stmt (pre_p, gimple_build_label (l1));
gimple_seq_add_seq (pre_p, copyin_seq);
gimple_seq_add_stmt (pre_p, gimple_build_label (l2));
}
/* Expand code for an OpenMP single directive. */
static void
lower_omp_single (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree block;
gimple t, bind, single_stmt = gsi_stmt (*gsi_p);
gimple_seq bind_body, dlist;
struct gimplify_ctx gctx;
push_gimplify_context (&gctx);
block = make_node (BLOCK);
bind = gimple_build_bind (NULL, NULL, block);
gsi_replace (gsi_p, bind, true);
bind_body = NULL;
dlist = NULL;
lower_rec_input_clauses (gimple_omp_single_clauses (single_stmt),
&bind_body, &dlist, ctx);
lower_omp (gimple_omp_body_ptr (single_stmt), ctx);
gimple_seq_add_stmt (&bind_body, single_stmt);
if (ctx->record_type)
lower_omp_single_copy (single_stmt, &bind_body, ctx);
else
lower_omp_single_simple (single_stmt, &bind_body);
gimple_omp_set_body (single_stmt, NULL);
gimple_seq_add_seq (&bind_body, dlist);
bind_body = maybe_catch_exception (bind_body);
t = gimple_build_omp_return
(!!find_omp_clause (gimple_omp_single_clauses (single_stmt),
OMP_CLAUSE_NOWAIT));
gimple_seq_add_stmt (&bind_body, t);
gimple_bind_set_body (bind, bind_body);
pop_gimplify_context (bind);
gimple_bind_append_vars (bind, ctx->block_vars);
BLOCK_VARS (block) = ctx->block_vars;
if (BLOCK_VARS (block))
TREE_USED (block) = 1;
}
/* Expand code for an OpenMP master directive. */
static void
lower_omp_master (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree block, lab = NULL, x, bfn_decl;
gimple stmt = gsi_stmt (*gsi_p), bind;
location_t loc = gimple_location (stmt);
gimple_seq tseq;
struct gimplify_ctx gctx;
push_gimplify_context (&gctx);
block = make_node (BLOCK);
bind = gimple_build_bind (NULL, NULL, block);
gsi_replace (gsi_p, bind, true);
gimple_bind_add_stmt (bind, stmt);
bfn_decl = builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM);
x = build_call_expr_loc (loc, bfn_decl, 0);
x = build2 (EQ_EXPR, boolean_type_node, x, integer_zero_node);
x = build3 (COND_EXPR, void_type_node, x, NULL, build_and_jump (&lab));
tseq = NULL;
gimplify_and_add (x, &tseq);
gimple_bind_add_seq (bind, tseq);
lower_omp (gimple_omp_body_ptr (stmt), ctx);
gimple_omp_set_body (stmt, maybe_catch_exception (gimple_omp_body (stmt)));
gimple_bind_add_seq (bind, gimple_omp_body (stmt));
gimple_omp_set_body (stmt, NULL);
gimple_bind_add_stmt (bind, gimple_build_label (lab));
gimple_bind_add_stmt (bind, gimple_build_omp_return (true));
pop_gimplify_context (bind);
gimple_bind_append_vars (bind, ctx->block_vars);
BLOCK_VARS (block) = ctx->block_vars;
}
/* Expand code for an OpenMP ordered directive. */
static void
lower_omp_ordered (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree block;
gimple stmt = gsi_stmt (*gsi_p), bind, x;
struct gimplify_ctx gctx;
push_gimplify_context (&gctx);
block = make_node (BLOCK);
bind = gimple_build_bind (NULL, NULL, block);
gsi_replace (gsi_p, bind, true);
gimple_bind_add_stmt (bind, stmt);
x = gimple_build_call (builtin_decl_explicit (BUILT_IN_GOMP_ORDERED_START),
0);
gimple_bind_add_stmt (bind, x);
lower_omp (gimple_omp_body_ptr (stmt), ctx);
gimple_omp_set_body (stmt, maybe_catch_exception (gimple_omp_body (stmt)));
gimple_bind_add_seq (bind, gimple_omp_body (stmt));
gimple_omp_set_body (stmt, NULL);
x = gimple_build_call (builtin_decl_explicit (BUILT_IN_GOMP_ORDERED_END), 0);
gimple_bind_add_stmt (bind, x);
gimple_bind_add_stmt (bind, gimple_build_omp_return (true));
pop_gimplify_context (bind);
gimple_bind_append_vars (bind, ctx->block_vars);
BLOCK_VARS (block) = gimple_bind_vars (bind);
}
/* Gimplify a GIMPLE_OMP_CRITICAL statement. This is a relatively simple
substitution of a couple of function calls. But in the NAMED case,
requires that languages coordinate a symbol name. It is therefore
best put here in common code. */
static GTY((param1_is (tree), param2_is (tree)))
splay_tree critical_name_mutexes;
static void
lower_omp_critical (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree block;
tree name, lock, unlock;
gimple stmt = gsi_stmt (*gsi_p), bind;
location_t loc = gimple_location (stmt);
gimple_seq tbody;
struct gimplify_ctx gctx;
name = gimple_omp_critical_name (stmt);
if (name)
{
tree decl;
splay_tree_node n;
if (!critical_name_mutexes)
critical_name_mutexes
= splay_tree_new_ggc (splay_tree_compare_pointers,
ggc_alloc_splay_tree_tree_node_tree_node_splay_tree_s,
ggc_alloc_splay_tree_tree_node_tree_node_splay_tree_node_s);
n = splay_tree_lookup (critical_name_mutexes, (splay_tree_key) name);
if (n == NULL)
{
char *new_str;
decl = create_tmp_var_raw (ptr_type_node, NULL);
new_str = ACONCAT ((".gomp_critical_user_",
IDENTIFIER_POINTER (name), NULL));
DECL_NAME (decl) = get_identifier (new_str);
TREE_PUBLIC (decl) = 1;
TREE_STATIC (decl) = 1;
DECL_COMMON (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
DECL_IGNORED_P (decl) = 1;
varpool_finalize_decl (decl);
splay_tree_insert (critical_name_mutexes, (splay_tree_key) name,
(splay_tree_value) decl);
}
else
decl = (tree) n->value;
lock = builtin_decl_explicit (BUILT_IN_GOMP_CRITICAL_NAME_START);
lock = build_call_expr_loc (loc, lock, 1, build_fold_addr_expr_loc (loc, decl));
unlock = builtin_decl_explicit (BUILT_IN_GOMP_CRITICAL_NAME_END);
unlock = build_call_expr_loc (loc, unlock, 1,
build_fold_addr_expr_loc (loc, decl));
}
else
{
lock = builtin_decl_explicit (BUILT_IN_GOMP_CRITICAL_START);
lock = build_call_expr_loc (loc, lock, 0);
unlock = builtin_decl_explicit (BUILT_IN_GOMP_CRITICAL_END);
unlock = build_call_expr_loc (loc, unlock, 0);
}
push_gimplify_context (&gctx);
block = make_node (BLOCK);
bind = gimple_build_bind (NULL, NULL, block);
gsi_replace (gsi_p, bind, true);
gimple_bind_add_stmt (bind, stmt);
tbody = gimple_bind_body (bind);
gimplify_and_add (lock, &tbody);
gimple_bind_set_body (bind, tbody);
lower_omp (gimple_omp_body_ptr (stmt), ctx);
gimple_omp_set_body (stmt, maybe_catch_exception (gimple_omp_body (stmt)));
gimple_bind_add_seq (bind, gimple_omp_body (stmt));
gimple_omp_set_body (stmt, NULL);
tbody = gimple_bind_body (bind);
gimplify_and_add (unlock, &tbody);
gimple_bind_set_body (bind, tbody);
gimple_bind_add_stmt (bind, gimple_build_omp_return (true));
pop_gimplify_context (bind);
gimple_bind_append_vars (bind, ctx->block_vars);
BLOCK_VARS (block) = gimple_bind_vars (bind);
}
/* A subroutine of lower_omp_for. Generate code to emit the predicate
for a lastprivate clause. Given a loop control predicate of (V
cond N2), we gate the clause on (!(V cond N2)). The lowered form
is appended to *DLIST, iterator initialization is appended to
*BODY_P. */
static void
lower_omp_for_lastprivate (struct omp_for_data *fd, gimple_seq *body_p,
gimple_seq *dlist, struct omp_context *ctx)
{
tree clauses, cond, vinit;
enum tree_code cond_code;
gimple_seq stmts;
cond_code = fd->loop.cond_code;
cond_code = cond_code == LT_EXPR ? GE_EXPR : LE_EXPR;
/* When possible, use a strict equality expression. This can let VRP
type optimizations deduce the value and remove a copy. */
if (host_integerp (fd->loop.step, 0))
{
HOST_WIDE_INT step = TREE_INT_CST_LOW (fd->loop.step);
if (step == 1 || step == -1)
cond_code = EQ_EXPR;
}
cond = build2 (cond_code, boolean_type_node, fd->loop.v, fd->loop.n2);
clauses = gimple_omp_for_clauses (fd->for_stmt);
stmts = NULL;
lower_lastprivate_clauses (clauses, cond, &stmts, ctx);
if (!gimple_seq_empty_p (stmts))
{
gimple_seq_add_seq (&stmts, *dlist);
*dlist = stmts;
/* Optimize: v = 0; is usually cheaper than v = some_other_constant. */
vinit = fd->loop.n1;
if (cond_code == EQ_EXPR
&& host_integerp (fd->loop.n2, 0)
&& ! integer_zerop (fd->loop.n2))
vinit = build_int_cst (TREE_TYPE (fd->loop.v), 0);
/* Initialize the iterator variable, so that threads that don't execute
any iterations don't execute the lastprivate clauses by accident. */
gimplify_assign (fd->loop.v, vinit, body_p);
}
}
/* Lower code for an OpenMP loop directive. */
static void
lower_omp_for (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree *rhs_p, block;
struct omp_for_data fd;
gimple stmt = gsi_stmt (*gsi_p), new_stmt;
gimple_seq omp_for_body, body, dlist;
size_t i;
struct gimplify_ctx gctx;
push_gimplify_context (&gctx);
lower_omp (gimple_omp_for_pre_body_ptr (stmt), ctx);
lower_omp (gimple_omp_body_ptr (stmt), ctx);
block = make_node (BLOCK);
new_stmt = gimple_build_bind (NULL, NULL, block);
/* Replace at gsi right away, so that 'stmt' is no member
of a sequence anymore as we're going to add to to a different
one below. */
gsi_replace (gsi_p, new_stmt, true);
/* Move declaration of temporaries in the loop body before we make
it go away. */
omp_for_body = gimple_omp_body (stmt);
if (!gimple_seq_empty_p (omp_for_body)
&& gimple_code (gimple_seq_first_stmt (omp_for_body)) == GIMPLE_BIND)
{
tree vars = gimple_bind_vars (gimple_seq_first_stmt (omp_for_body));
gimple_bind_append_vars (new_stmt, vars);
}
/* The pre-body and input clauses go before the lowered GIMPLE_OMP_FOR. */
dlist = NULL;
body = NULL;
lower_rec_input_clauses (gimple_omp_for_clauses (stmt), &body, &dlist, ctx);
gimple_seq_add_seq (&body, gimple_omp_for_pre_body (stmt));
/* Lower the header expressions. At this point, we can assume that
the header is of the form:
#pragma omp for (V = VAL1; V {<|>|<=|>=} VAL2; V = V [+-] VAL3)
We just need to make sure that VAL1, VAL2 and VAL3 are lowered
using the .omp_data_s mapping, if needed. */
for (i = 0; i < gimple_omp_for_collapse (stmt); i++)
{
rhs_p = gimple_omp_for_initial_ptr (stmt, i);
if (!is_gimple_min_invariant (*rhs_p))
*rhs_p = get_formal_tmp_var (*rhs_p, &body);
rhs_p = gimple_omp_for_final_ptr (stmt, i);
if (!is_gimple_min_invariant (*rhs_p))
*rhs_p = get_formal_tmp_var (*rhs_p, &body);
rhs_p = &TREE_OPERAND (gimple_omp_for_incr (stmt, i), 1);
if (!is_gimple_min_invariant (*rhs_p))
*rhs_p = get_formal_tmp_var (*rhs_p, &body);
}
/* Once lowered, extract the bounds and clauses. */
extract_omp_for_data (stmt, &fd, NULL);
lower_omp_for_lastprivate (&fd, &body, &dlist, ctx);
gimple_seq_add_stmt (&body, stmt);
gimple_seq_add_seq (&body, gimple_omp_body (stmt));
gimple_seq_add_stmt (&body, gimple_build_omp_continue (fd.loop.v,
fd.loop.v));
/* After the loop, add exit clauses. */
lower_reduction_clauses (gimple_omp_for_clauses (stmt), &body, ctx);
gimple_seq_add_seq (&body, dlist);
body = maybe_catch_exception (body);
/* Region exit marker goes at the end of the loop body. */
gimple_seq_add_stmt (&body, gimple_build_omp_return (fd.have_nowait));
pop_gimplify_context (new_stmt);
gimple_bind_append_vars (new_stmt, ctx->block_vars);
BLOCK_VARS (block) = gimple_bind_vars (new_stmt);
if (BLOCK_VARS (block))
TREE_USED (block) = 1;
gimple_bind_set_body (new_stmt, body);
gimple_omp_set_body (stmt, NULL);
gimple_omp_for_set_pre_body (stmt, NULL);
}
/* Callback for walk_stmts. Check if the current statement only contains
GIMPLE_OMP_FOR or GIMPLE_OMP_PARALLEL. */
static tree
check_combined_parallel (gimple_stmt_iterator *gsi_p,
bool *handled_ops_p,
struct walk_stmt_info *wi)
{
int *info = (int *) wi->info;
gimple stmt = gsi_stmt (*gsi_p);
*handled_ops_p = true;
switch (gimple_code (stmt))
{
WALK_SUBSTMTS;
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
*info = *info == 0 ? 1 : -1;
break;
default:
*info = -1;
break;
}
return NULL;
}
struct omp_taskcopy_context
{
/* This field must be at the beginning, as we do "inheritance": Some
callback functions for tree-inline.c (e.g., omp_copy_decl)
receive a copy_body_data pointer that is up-casted to an
omp_context pointer. */
copy_body_data cb;
omp_context *ctx;
};
static tree
task_copyfn_copy_decl (tree var, copy_body_data *cb)
{
struct omp_taskcopy_context *tcctx = (struct omp_taskcopy_context *) cb;
if (splay_tree_lookup (tcctx->ctx->sfield_map, (splay_tree_key) var))
return create_tmp_var (TREE_TYPE (var), NULL);
return var;
}
static tree
task_copyfn_remap_type (struct omp_taskcopy_context *tcctx, tree orig_type)
{
tree name, new_fields = NULL, type, f;
type = lang_hooks.types.make_type (RECORD_TYPE);
name = DECL_NAME (TYPE_NAME (orig_type));
name = build_decl (gimple_location (tcctx->ctx->stmt),
TYPE_DECL, name, type);
TYPE_NAME (type) = name;
for (f = TYPE_FIELDS (orig_type); f ; f = TREE_CHAIN (f))
{
tree new_f = copy_node (f);
DECL_CONTEXT (new_f) = type;
TREE_TYPE (new_f) = remap_type (TREE_TYPE (f), &tcctx->cb);
TREE_CHAIN (new_f) = new_fields;
walk_tree (&DECL_SIZE (new_f), copy_tree_body_r, &tcctx->cb, NULL);
walk_tree (&DECL_SIZE_UNIT (new_f), copy_tree_body_r, &tcctx->cb, NULL);
walk_tree (&DECL_FIELD_OFFSET (new_f), copy_tree_body_r,
&tcctx->cb, NULL);
new_fields = new_f;
*pointer_map_insert (tcctx->cb.decl_map, f) = new_f;
}
TYPE_FIELDS (type) = nreverse (new_fields);
layout_type (type);
return type;
}
/* Create task copyfn. */
static void
create_task_copyfn (gimple task_stmt, omp_context *ctx)
{
struct function *child_cfun;
tree child_fn, t, c, src, dst, f, sf, arg, sarg, decl;
tree record_type, srecord_type, bind, list;
bool record_needs_remap = false, srecord_needs_remap = false;
splay_tree_node n;
struct omp_taskcopy_context tcctx;
struct gimplify_ctx gctx;
location_t loc = gimple_location (task_stmt);
child_fn = gimple_omp_task_copy_fn (task_stmt);
child_cfun = DECL_STRUCT_FUNCTION (child_fn);
gcc_assert (child_cfun->cfg == NULL);
DECL_SAVED_TREE (child_fn) = alloc_stmt_list ();
/* Reset DECL_CONTEXT on function arguments. */
for (t = DECL_ARGUMENTS (child_fn); t; t = DECL_CHAIN (t))
DECL_CONTEXT (t) = child_fn;
/* Populate the function. */
push_gimplify_context (&gctx);
push_cfun (child_cfun);
bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
TREE_SIDE_EFFECTS (bind) = 1;
list = NULL;
DECL_SAVED_TREE (child_fn) = bind;
DECL_SOURCE_LOCATION (child_fn) = gimple_location (task_stmt);
/* Remap src and dst argument types if needed. */
record_type = ctx->record_type;
srecord_type = ctx->srecord_type;
for (f = TYPE_FIELDS (record_type); f ; f = DECL_CHAIN (f))
if (variably_modified_type_p (TREE_TYPE (f), ctx->cb.src_fn))
{
record_needs_remap = true;
break;
}
for (f = TYPE_FIELDS (srecord_type); f ; f = DECL_CHAIN (f))
if (variably_modified_type_p (TREE_TYPE (f), ctx->cb.src_fn))
{
srecord_needs_remap = true;
break;
}
if (record_needs_remap || srecord_needs_remap)
{
memset (&tcctx, '\0', sizeof (tcctx));
tcctx.cb.src_fn = ctx->cb.src_fn;
tcctx.cb.dst_fn = child_fn;
tcctx.cb.src_node = cgraph_get_node (tcctx.cb.src_fn);
gcc_checking_assert (tcctx.cb.src_node);
tcctx.cb.dst_node = tcctx.cb.src_node;
tcctx.cb.src_cfun = ctx->cb.src_cfun;
tcctx.cb.copy_decl = task_copyfn_copy_decl;
tcctx.cb.eh_lp_nr = 0;
tcctx.cb.transform_call_graph_edges = CB_CGE_MOVE;
tcctx.cb.decl_map = pointer_map_create ();
tcctx.ctx = ctx;
if (record_needs_remap)
record_type = task_copyfn_remap_type (&tcctx, record_type);
if (srecord_needs_remap)
srecord_type = task_copyfn_remap_type (&tcctx, srecord_type);
}
else
tcctx.cb.decl_map = NULL;
arg = DECL_ARGUMENTS (child_fn);
TREE_TYPE (arg) = build_pointer_type (record_type);
sarg = DECL_CHAIN (arg);
TREE_TYPE (sarg) = build_pointer_type (srecord_type);
/* First pass: initialize temporaries used in record_type and srecord_type
sizes and field offsets. */
if (tcctx.cb.decl_map)
for (c = gimple_omp_task_clauses (task_stmt); c; c = OMP_CLAUSE_CHAIN (c))
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_FIRSTPRIVATE)
{
tree *p;
decl = OMP_CLAUSE_DECL (c);
p = (tree *) pointer_map_contains (tcctx.cb.decl_map, decl);
if (p == NULL)
continue;
n = splay_tree_lookup (ctx->sfield_map, (splay_tree_key) decl);
sf = (tree) n->value;
sf = *(tree *) pointer_map_contains (tcctx.cb.decl_map, sf);
src = build_simple_mem_ref_loc (loc, sarg);
src = omp_build_component_ref (src, sf);
t = build2 (MODIFY_EXPR, TREE_TYPE (*p), *p, src);
append_to_statement_list (t, &list);
}
/* Second pass: copy shared var pointers and copy construct non-VLA
firstprivate vars. */
for (c = gimple_omp_task_clauses (task_stmt); c; c = OMP_CLAUSE_CHAIN (c))
switch (OMP_CLAUSE_CODE (c))
{
case OMP_CLAUSE_SHARED:
decl = OMP_CLAUSE_DECL (c);
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) decl);
if (n == NULL)
break;
f = (tree) n->value;
if (tcctx.cb.decl_map)
f = *(tree *) pointer_map_contains (tcctx.cb.decl_map, f);
n = splay_tree_lookup (ctx->sfield_map, (splay_tree_key) decl);
sf = (tree) n->value;
if (tcctx.cb.decl_map)
sf = *(tree *) pointer_map_contains (tcctx.cb.decl_map, sf);
src = build_simple_mem_ref_loc (loc, sarg);
src = omp_build_component_ref (src, sf);
dst = build_simple_mem_ref_loc (loc, arg);
dst = omp_build_component_ref (dst, f);
t = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
append_to_statement_list (t, &list);
break;
case OMP_CLAUSE_FIRSTPRIVATE:
decl = OMP_CLAUSE_DECL (c);
if (is_variable_sized (decl))
break;
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) decl);
if (n == NULL)
break;
f = (tree) n->value;
if (tcctx.cb.decl_map)
f = *(tree *) pointer_map_contains (tcctx.cb.decl_map, f);
n = splay_tree_lookup (ctx->sfield_map, (splay_tree_key) decl);
if (n != NULL)
{
sf = (tree) n->value;
if (tcctx.cb.decl_map)
sf = *(tree *) pointer_map_contains (tcctx.cb.decl_map, sf);
src = build_simple_mem_ref_loc (loc, sarg);
src = omp_build_component_ref (src, sf);
if (use_pointer_for_field (decl, NULL) || is_reference (decl))
src = build_simple_mem_ref_loc (loc, src);
}
else
src = decl;
dst = build_simple_mem_ref_loc (loc, arg);
dst = omp_build_component_ref (dst, f);
t = lang_hooks.decls.omp_clause_copy_ctor (c, dst, src);
append_to_statement_list (t, &list);
break;
case OMP_CLAUSE_PRIVATE:
if (! OMP_CLAUSE_PRIVATE_OUTER_REF (c))
break;
decl = OMP_CLAUSE_DECL (c);
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) decl);
f = (tree) n->value;
if (tcctx.cb.decl_map)
f = *(tree *) pointer_map_contains (tcctx.cb.decl_map, f);
n = splay_tree_lookup (ctx->sfield_map, (splay_tree_key) decl);
if (n != NULL)
{
sf = (tree) n->value;
if (tcctx.cb.decl_map)
sf = *(tree *) pointer_map_contains (tcctx.cb.decl_map, sf);
src = build_simple_mem_ref_loc (loc, sarg);
src = omp_build_component_ref (src, sf);
if (use_pointer_for_field (decl, NULL))
src = build_simple_mem_ref_loc (loc, src);
}
else
src = decl;
dst = build_simple_mem_ref_loc (loc, arg);
dst = omp_build_component_ref (dst, f);
t = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
append_to_statement_list (t, &list);
break;
default:
break;
}
/* Last pass: handle VLA firstprivates. */
if (tcctx.cb.decl_map)
for (c = gimple_omp_task_clauses (task_stmt); c; c = OMP_CLAUSE_CHAIN (c))
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_FIRSTPRIVATE)
{
tree ind, ptr, df;
decl = OMP_CLAUSE_DECL (c);
if (!is_variable_sized (decl))
continue;
n = splay_tree_lookup (ctx->field_map, (splay_tree_key) decl);
if (n == NULL)
continue;
f = (tree) n->value;
f = *(tree *) pointer_map_contains (tcctx.cb.decl_map, f);
gcc_assert (DECL_HAS_VALUE_EXPR_P (decl));
ind = DECL_VALUE_EXPR (decl);
gcc_assert (TREE_CODE (ind) == INDIRECT_REF);
gcc_assert (DECL_P (TREE_OPERAND (ind, 0)));
n = splay_tree_lookup (ctx->sfield_map,
(splay_tree_key) TREE_OPERAND (ind, 0));
sf = (tree) n->value;
sf = *(tree *) pointer_map_contains (tcctx.cb.decl_map, sf);
src = build_simple_mem_ref_loc (loc, sarg);
src = omp_build_component_ref (src, sf);
src = build_simple_mem_ref_loc (loc, src);
dst = build_simple_mem_ref_loc (loc, arg);
dst = omp_build_component_ref (dst, f);
t = lang_hooks.decls.omp_clause_copy_ctor (c, dst, src);
append_to_statement_list (t, &list);
n = splay_tree_lookup (ctx->field_map,
(splay_tree_key) TREE_OPERAND (ind, 0));
df = (tree) n->value;
df = *(tree *) pointer_map_contains (tcctx.cb.decl_map, df);
ptr = build_simple_mem_ref_loc (loc, arg);
ptr = omp_build_component_ref (ptr, df);
t = build2 (MODIFY_EXPR, TREE_TYPE (ptr), ptr,
build_fold_addr_expr_loc (loc, dst));
append_to_statement_list (t, &list);
}
t = build1 (RETURN_EXPR, void_type_node, NULL);
append_to_statement_list (t, &list);
if (tcctx.cb.decl_map)
pointer_map_destroy (tcctx.cb.decl_map);
pop_gimplify_context (NULL);
BIND_EXPR_BODY (bind) = list;
pop_cfun ();
}
/* Lower the OpenMP parallel or task directive in the current statement
in GSI_P. CTX holds context information for the directive. */
static void
lower_omp_taskreg (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
tree clauses;
tree child_fn, t;
gimple stmt = gsi_stmt (*gsi_p);
gimple par_bind, bind;
gimple_seq par_body, olist, ilist, par_olist, par_ilist, new_body;
struct gimplify_ctx gctx;
location_t loc = gimple_location (stmt);
clauses = gimple_omp_taskreg_clauses (stmt);
par_bind = gimple_seq_first_stmt (gimple_omp_body (stmt));
par_body = gimple_bind_body (par_bind);
child_fn = ctx->cb.dst_fn;
if (gimple_code (stmt) == GIMPLE_OMP_PARALLEL
&& !gimple_omp_parallel_combined_p (stmt))
{
struct walk_stmt_info wi;
int ws_num = 0;
memset (&wi, 0, sizeof (wi));
wi.info = &ws_num;
wi.val_only = true;
walk_gimple_seq (par_body, check_combined_parallel, NULL, &wi);
if (ws_num == 1)
gimple_omp_parallel_set_combined_p (stmt, true);
}
if (ctx->srecord_type)
create_task_copyfn (stmt, ctx);
push_gimplify_context (&gctx);
par_olist = NULL;
par_ilist = NULL;
lower_rec_input_clauses (clauses, &par_ilist, &par_olist, ctx);
lower_omp (&par_body, ctx);
if (gimple_code (stmt) == GIMPLE_OMP_PARALLEL)
lower_reduction_clauses (clauses, &par_olist, ctx);
/* Declare all the variables created by mapping and the variables
declared in the scope of the parallel body. */
record_vars_into (ctx->block_vars, child_fn);
record_vars_into (gimple_bind_vars (par_bind), child_fn);
if (ctx->record_type)
{
ctx->sender_decl
= create_tmp_var (ctx->srecord_type ? ctx->srecord_type
: ctx->record_type, ".omp_data_o");
DECL_NAMELESS (ctx->sender_decl) = 1;
TREE_ADDRESSABLE (ctx->sender_decl) = 1;
gimple_omp_taskreg_set_data_arg (stmt, ctx->sender_decl);
}
olist = NULL;
ilist = NULL;
lower_send_clauses (clauses, &ilist, &olist, ctx);
lower_send_shared_vars (&ilist, &olist, ctx);
/* Once all the expansions are done, sequence all the different
fragments inside gimple_omp_body. */
new_body = NULL;
if (ctx->record_type)
{
t = build_fold_addr_expr_loc (loc, ctx->sender_decl);
/* fixup_child_record_type might have changed receiver_decl's type. */
t = fold_convert_loc (loc, TREE_TYPE (ctx->receiver_decl), t);
gimple_seq_add_stmt (&new_body,
gimple_build_assign (ctx->receiver_decl, t));
}
gimple_seq_add_seq (&new_body, par_ilist);
gimple_seq_add_seq (&new_body, par_body);
gimple_seq_add_seq (&new_body, par_olist);
new_body = maybe_catch_exception (new_body);
gimple_seq_add_stmt (&new_body, gimple_build_omp_return (false));
gimple_omp_set_body (stmt, new_body);
bind = gimple_build_bind (NULL, NULL, gimple_bind_block (par_bind));
gsi_replace (gsi_p, bind, true);
gimple_bind_add_seq (bind, ilist);
gimple_bind_add_stmt (bind, stmt);
gimple_bind_add_seq (bind, olist);
pop_gimplify_context (NULL);
}
/* Callback for lower_omp_1. Return non-NULL if *tp needs to be
regimplified. If DATA is non-NULL, lower_omp_1 is outside
of OpenMP context, but with task_shared_vars set. */
static tree
lower_omp_regimplify_p (tree *tp, int *walk_subtrees,
void *data)
{
tree t = *tp;
/* Any variable with DECL_VALUE_EXPR needs to be regimplified. */
if (TREE_CODE (t) == VAR_DECL && data == NULL && DECL_HAS_VALUE_EXPR_P (t))
return t;
if (task_shared_vars
&& DECL_P (t)
&& bitmap_bit_p (task_shared_vars, DECL_UID (t)))
return t;
/* If a global variable has been privatized, TREE_CONSTANT on
ADDR_EXPR might be wrong. */
if (data == NULL && TREE_CODE (t) == ADDR_EXPR)
recompute_tree_invariant_for_addr_expr (t);
*walk_subtrees = !TYPE_P (t) && !DECL_P (t);
return NULL_TREE;
}
static void
lower_omp_1 (gimple_stmt_iterator *gsi_p, omp_context *ctx)
{
gimple stmt = gsi_stmt (*gsi_p);
struct walk_stmt_info wi;
if (gimple_has_location (stmt))
input_location = gimple_location (stmt);
if (task_shared_vars)
memset (&wi, '\0', sizeof (wi));
/* If we have issued syntax errors, avoid doing any heavy lifting.
Just replace the OpenMP directives with a NOP to avoid
confusing RTL expansion. */
if (seen_error () && is_gimple_omp (stmt))
{
gsi_replace (gsi_p, gimple_build_nop (), true);
return;
}
switch (gimple_code (stmt))
{
case GIMPLE_COND:
if ((ctx || task_shared_vars)
&& (walk_tree (gimple_cond_lhs_ptr (stmt), lower_omp_regimplify_p,
ctx ? NULL : &wi, NULL)
|| walk_tree (gimple_cond_rhs_ptr (stmt), lower_omp_regimplify_p,
ctx ? NULL : &wi, NULL)))
gimple_regimplify_operands (stmt, gsi_p);
break;
case GIMPLE_CATCH:
lower_omp (gimple_catch_handler_ptr (stmt), ctx);
break;
case GIMPLE_EH_FILTER:
lower_omp (gimple_eh_filter_failure_ptr (stmt), ctx);
break;
case GIMPLE_TRY:
lower_omp (gimple_try_eval_ptr (stmt), ctx);
lower_omp (gimple_try_cleanup_ptr (stmt), ctx);
break;
case GIMPLE_TRANSACTION:
lower_omp (gimple_transaction_body_ptr (stmt), ctx);
break;
case GIMPLE_BIND:
lower_omp (gimple_bind_body_ptr (stmt), ctx);
break;
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
ctx = maybe_lookup_ctx (stmt);
lower_omp_taskreg (gsi_p, ctx);
break;
case GIMPLE_OMP_FOR:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_for (gsi_p, ctx);
break;
case GIMPLE_OMP_SECTIONS:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_sections (gsi_p, ctx);
break;
case GIMPLE_OMP_SINGLE:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_single (gsi_p, ctx);
break;
case GIMPLE_OMP_MASTER:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_master (gsi_p, ctx);
break;
case GIMPLE_OMP_ORDERED:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_ordered (gsi_p, ctx);
break;
case GIMPLE_OMP_CRITICAL:
ctx = maybe_lookup_ctx (stmt);
gcc_assert (ctx);
lower_omp_critical (gsi_p, ctx);
break;
case GIMPLE_OMP_ATOMIC_LOAD:
if ((ctx || task_shared_vars)
&& walk_tree (gimple_omp_atomic_load_rhs_ptr (stmt),
lower_omp_regimplify_p, ctx ? NULL : &wi, NULL))
gimple_regimplify_operands (stmt, gsi_p);
break;
default:
if ((ctx || task_shared_vars)
&& walk_gimple_op (stmt, lower_omp_regimplify_p,
ctx ? NULL : &wi))
gimple_regimplify_operands (stmt, gsi_p);
break;
}
}
static void
lower_omp (gimple_seq *body, omp_context *ctx)
{
location_t saved_location = input_location;
gimple_stmt_iterator gsi;
for (gsi = gsi_start (*body); !gsi_end_p (gsi); gsi_next (&gsi))
lower_omp_1 (&gsi, ctx);
input_location = saved_location;
}
/* Main entry point. */
static unsigned int
execute_lower_omp (void)
{
gimple_seq body;
/* This pass always runs, to provide PROP_gimple_lomp.
But there is nothing to do unless -fopenmp is given. */
if (flag_openmp == 0)
return 0;
all_contexts = splay_tree_new (splay_tree_compare_pointers, 0,
delete_omp_context);
body = gimple_body (current_function_decl);
scan_omp (&body, NULL);
gcc_assert (taskreg_nesting_level == 0);
if (all_contexts->root)
{
struct gimplify_ctx gctx;
if (task_shared_vars)
push_gimplify_context (&gctx);
lower_omp (&body, NULL);
if (task_shared_vars)
pop_gimplify_context (NULL);
}
if (all_contexts)
{
splay_tree_delete (all_contexts);
all_contexts = NULL;
}
BITMAP_FREE (task_shared_vars);
return 0;
}
struct gimple_opt_pass pass_lower_omp =
{
{
GIMPLE_PASS,
"omplower", /* name */
NULL, /* gate */
execute_lower_omp, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_NONE, /* tv_id */
PROP_gimple_any, /* properties_required */
PROP_gimple_lomp, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
/* The following is a utility to diagnose OpenMP structured block violations.
It is not part of the "omplower" pass, as that's invoked too late. It
should be invoked by the respective front ends after gimplification. */
static splay_tree all_labels;
/* Check for mismatched contexts and generate an error if needed. Return
true if an error is detected. */
static bool
diagnose_sb_0 (gimple_stmt_iterator *gsi_p,
gimple branch_ctx, gimple label_ctx)
{
if (label_ctx == branch_ctx)
return false;
/*
Previously we kept track of the label's entire context in diagnose_sb_[12]
so we could traverse it and issue a correct "exit" or "enter" error
message upon a structured block violation.
We built the context by building a list with tree_cons'ing, but there is
no easy counterpart in gimple tuples. It seems like far too much work
for issuing exit/enter error messages. If someone really misses the
distinct error message... patches welcome.
*/
#if 0
/* Try to avoid confusing the user by producing and error message
with correct "exit" or "enter" verbiage. We prefer "exit"
unless we can show that LABEL_CTX is nested within BRANCH_CTX. */
if (branch_ctx == NULL)
exit_p = false;
else
{
while (label_ctx)
{
if (TREE_VALUE (label_ctx) == branch_ctx)
{
exit_p = false;
break;
}
label_ctx = TREE_CHAIN (label_ctx);
}
}
if (exit_p)
error ("invalid exit from OpenMP structured block");
else
error ("invalid entry to OpenMP structured block");
#endif
/* If it's obvious we have an invalid entry, be specific about the error. */
if (branch_ctx == NULL)
error ("invalid entry to OpenMP structured block");
else
/* Otherwise, be vague and lazy, but efficient. */
error ("invalid branch to/from an OpenMP structured block");
gsi_replace (gsi_p, gimple_build_nop (), false);
return true;
}
/* Pass 1: Create a minimal tree of OpenMP structured blocks, and record
where each label is found. */
static tree
diagnose_sb_1 (gimple_stmt_iterator *gsi_p, bool *handled_ops_p,
struct walk_stmt_info *wi)
{
gimple context = (gimple) wi->info;
gimple inner_context;
gimple stmt = gsi_stmt (*gsi_p);
*handled_ops_p = true;
switch (gimple_code (stmt))
{
WALK_SUBSTMTS;
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_SECTION:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
/* The minimal context here is just the current OMP construct. */
inner_context = stmt;
wi->info = inner_context;
walk_gimple_seq (gimple_omp_body (stmt), diagnose_sb_1, NULL, wi);
wi->info = context;
break;
case GIMPLE_OMP_FOR:
inner_context = stmt;
wi->info = inner_context;
/* gimple_omp_for_{index,initial,final} are all DECLs; no need to
walk them. */
walk_gimple_seq (gimple_omp_for_pre_body (stmt),
diagnose_sb_1, NULL, wi);
walk_gimple_seq (gimple_omp_body (stmt), diagnose_sb_1, NULL, wi);
wi->info = context;
break;
case GIMPLE_LABEL:
splay_tree_insert (all_labels, (splay_tree_key) gimple_label_label (stmt),
(splay_tree_value) context);
break;
default:
break;
}
return NULL_TREE;
}
/* Pass 2: Check each branch and see if its context differs from that of
the destination label's context. */
static tree
diagnose_sb_2 (gimple_stmt_iterator *gsi_p, bool *handled_ops_p,
struct walk_stmt_info *wi)
{
gimple context = (gimple) wi->info;
splay_tree_node n;
gimple stmt = gsi_stmt (*gsi_p);
*handled_ops_p = true;
switch (gimple_code (stmt))
{
WALK_SUBSTMTS;
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_SECTION:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
wi->info = stmt;
walk_gimple_seq_mod (gimple_omp_body_ptr (stmt), diagnose_sb_2, NULL, wi);
wi->info = context;
break;
case GIMPLE_OMP_FOR:
wi->info = stmt;
/* gimple_omp_for_{index,initial,final} are all DECLs; no need to
walk them. */
walk_gimple_seq_mod (gimple_omp_for_pre_body_ptr (stmt),
diagnose_sb_2, NULL, wi);
walk_gimple_seq_mod (gimple_omp_body_ptr (stmt), diagnose_sb_2, NULL, wi);
wi->info = context;
break;
case GIMPLE_COND:
{
tree lab = gimple_cond_true_label (stmt);
if (lab)
{
n = splay_tree_lookup (all_labels,
(splay_tree_key) lab);
diagnose_sb_0 (gsi_p, context,
n ? (gimple) n->value : NULL);
}
lab = gimple_cond_false_label (stmt);
if (lab)
{
n = splay_tree_lookup (all_labels,
(splay_tree_key) lab);
diagnose_sb_0 (gsi_p, context,
n ? (gimple) n->value : NULL);
}
}
break;
case GIMPLE_GOTO:
{
tree lab = gimple_goto_dest (stmt);
if (TREE_CODE (lab) != LABEL_DECL)
break;
n = splay_tree_lookup (all_labels, (splay_tree_key) lab);
diagnose_sb_0 (gsi_p, context, n ? (gimple) n->value : NULL);
}
break;
case GIMPLE_SWITCH:
{
unsigned int i;
for (i = 0; i < gimple_switch_num_labels (stmt); ++i)
{
tree lab = CASE_LABEL (gimple_switch_label (stmt, i));
n = splay_tree_lookup (all_labels, (splay_tree_key) lab);
if (n && diagnose_sb_0 (gsi_p, context, (gimple) n->value))
break;
}
}
break;
case GIMPLE_RETURN:
diagnose_sb_0 (gsi_p, context, NULL);
break;
default:
break;
}
return NULL_TREE;
}
static unsigned int
diagnose_omp_structured_block_errors (void)
{
struct walk_stmt_info wi;
gimple_seq body = gimple_body (current_function_decl);
all_labels = splay_tree_new (splay_tree_compare_pointers, 0, 0);
memset (&wi, 0, sizeof (wi));
walk_gimple_seq (body, diagnose_sb_1, NULL, &wi);
memset (&wi, 0, sizeof (wi));
wi.want_locations = true;
walk_gimple_seq_mod (&body, diagnose_sb_2, NULL, &wi);
gimple_set_body (current_function_decl, body);
splay_tree_delete (all_labels);
all_labels = NULL;
return 0;
}
static bool
gate_diagnose_omp_blocks (void)
{
return flag_openmp != 0;
}
struct gimple_opt_pass pass_diagnose_omp_blocks =
{
{
GIMPLE_PASS,
"*diagnose_omp_blocks", /* name */
gate_diagnose_omp_blocks, /* gate */
diagnose_omp_structured_block_errors, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_NONE, /* tv_id */
PROP_gimple_any, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0, /* todo_flags_finish */
}
};
#include "gt-omp-low.h"
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