2099 lines
54 KiB
C
2099 lines
54 KiB
C
/* Conversion of SESE regions to Polyhedra.
|
|
Copyright (C) 2009 Free Software Foundation, Inc.
|
|
Contributed by Sebastian Pop <sebastian.pop@amd.com>.
|
|
|
|
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 "ggc.h"
|
|
#include "tree.h"
|
|
#include "rtl.h"
|
|
#include "basic-block.h"
|
|
#include "diagnostic.h"
|
|
#include "tree-flow.h"
|
|
#include "toplev.h"
|
|
#include "tree-dump.h"
|
|
#include "timevar.h"
|
|
#include "cfgloop.h"
|
|
#include "tree-chrec.h"
|
|
#include "tree-data-ref.h"
|
|
#include "tree-scalar-evolution.h"
|
|
#include "tree-pass.h"
|
|
#include "domwalk.h"
|
|
#include "value-prof.h"
|
|
#include "pointer-set.h"
|
|
#include "gimple.h"
|
|
#include "sese.h"
|
|
|
|
#ifdef HAVE_cloog
|
|
#include "cloog/cloog.h"
|
|
#include "ppl_c.h"
|
|
#include "graphite-ppl.h"
|
|
#include "graphite.h"
|
|
#include "graphite-poly.h"
|
|
#include "graphite-scop-detection.h"
|
|
#include "graphite-clast-to-gimple.h"
|
|
#include "graphite-sese-to-poly.h"
|
|
|
|
/* Check if VAR is used in a phi node, that is no loop header. */
|
|
|
|
static bool
|
|
var_used_in_not_loop_header_phi_node (tree var)
|
|
{
|
|
|
|
imm_use_iterator imm_iter;
|
|
gimple stmt;
|
|
bool result = false;
|
|
|
|
FOR_EACH_IMM_USE_STMT (stmt, imm_iter, var)
|
|
{
|
|
basic_block bb = gimple_bb (stmt);
|
|
|
|
if (gimple_code (stmt) == GIMPLE_PHI
|
|
&& bb->loop_father->header != bb)
|
|
result = true;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Returns the index of the phi argument corresponding to the initial
|
|
value in the loop. */
|
|
|
|
static size_t
|
|
loop_entry_phi_arg (gimple phi)
|
|
{
|
|
loop_p loop = gimple_bb (phi)->loop_father;
|
|
size_t i;
|
|
|
|
for (i = 0; i < gimple_phi_num_args (phi); i++)
|
|
if (!flow_bb_inside_loop_p (loop, gimple_phi_arg_edge (phi, i)->src))
|
|
return i;
|
|
|
|
gcc_unreachable ();
|
|
return 0;
|
|
}
|
|
|
|
/* Removes a simple copy phi node "RES = phi (INIT, RES)" at position
|
|
PSI by inserting on the loop ENTRY edge assignment "RES = INIT". */
|
|
|
|
static void
|
|
remove_simple_copy_phi (gimple_stmt_iterator *psi)
|
|
{
|
|
gimple phi = gsi_stmt (*psi);
|
|
tree res = gimple_phi_result (phi);
|
|
size_t entry = loop_entry_phi_arg (phi);
|
|
tree init = gimple_phi_arg_def (phi, entry);
|
|
gimple stmt = gimple_build_assign (res, init);
|
|
edge e = gimple_phi_arg_edge (phi, entry);
|
|
|
|
remove_phi_node (psi, false);
|
|
gsi_insert_on_edge_immediate (e, stmt);
|
|
SSA_NAME_DEF_STMT (res) = stmt;
|
|
}
|
|
|
|
/* Removes an invariant phi node at position PSI by inserting on the
|
|
loop ENTRY edge the assignment RES = INIT. */
|
|
|
|
static void
|
|
remove_invariant_phi (sese region, gimple_stmt_iterator *psi)
|
|
{
|
|
gimple phi = gsi_stmt (*psi);
|
|
loop_p loop = loop_containing_stmt (phi);
|
|
tree res = gimple_phi_result (phi);
|
|
tree scev = scalar_evolution_in_region (region, loop, res);
|
|
size_t entry = loop_entry_phi_arg (phi);
|
|
edge e = gimple_phi_arg_edge (phi, entry);
|
|
tree var;
|
|
gimple stmt;
|
|
gimple_seq stmts;
|
|
gimple_stmt_iterator gsi;
|
|
|
|
if (tree_contains_chrecs (scev, NULL))
|
|
scev = gimple_phi_arg_def (phi, entry);
|
|
|
|
var = force_gimple_operand (scev, &stmts, true, NULL_TREE);
|
|
stmt = gimple_build_assign (res, var);
|
|
remove_phi_node (psi, false);
|
|
|
|
if (!stmts)
|
|
stmts = gimple_seq_alloc ();
|
|
|
|
gsi = gsi_last (stmts);
|
|
gsi_insert_after (&gsi, stmt, GSI_NEW_STMT);
|
|
gsi_insert_seq_on_edge (e, stmts);
|
|
gsi_commit_edge_inserts ();
|
|
SSA_NAME_DEF_STMT (res) = stmt;
|
|
}
|
|
|
|
/* Returns true when the phi node at PSI is of the form "a = phi (a, x)". */
|
|
|
|
static inline bool
|
|
simple_copy_phi_p (gimple phi)
|
|
{
|
|
tree res;
|
|
|
|
if (gimple_phi_num_args (phi) != 2)
|
|
return false;
|
|
|
|
res = gimple_phi_result (phi);
|
|
return (res == gimple_phi_arg_def (phi, 0)
|
|
|| res == gimple_phi_arg_def (phi, 1));
|
|
}
|
|
|
|
/* Returns true when the phi node at position PSI is a reduction phi
|
|
node in REGION. Otherwise moves the pointer PSI to the next phi to
|
|
be considered. */
|
|
|
|
static bool
|
|
reduction_phi_p (sese region, gimple_stmt_iterator *psi)
|
|
{
|
|
loop_p loop;
|
|
tree scev;
|
|
affine_iv iv;
|
|
gimple phi = gsi_stmt (*psi);
|
|
tree res = gimple_phi_result (phi);
|
|
|
|
if (!is_gimple_reg (res))
|
|
{
|
|
gsi_next (psi);
|
|
return false;
|
|
}
|
|
|
|
loop = loop_containing_stmt (phi);
|
|
|
|
if (simple_copy_phi_p (phi))
|
|
{
|
|
/* FIXME: PRE introduces phi nodes like these, for an example,
|
|
see id-5.f in the fortran graphite testsuite:
|
|
|
|
# prephitmp.85_265 = PHI <prephitmp.85_258(33), prephitmp.85_265(18)>
|
|
*/
|
|
remove_simple_copy_phi (psi);
|
|
return false;
|
|
}
|
|
|
|
/* Main induction variables with constant strides in LOOP are not
|
|
reductions. */
|
|
if (simple_iv (loop, loop, res, &iv, true))
|
|
{
|
|
gsi_next (psi);
|
|
return false;
|
|
}
|
|
|
|
scev = scalar_evolution_in_region (region, loop, res);
|
|
if (chrec_contains_undetermined (scev))
|
|
return true;
|
|
|
|
if (evolution_function_is_invariant_p (scev, loop->num))
|
|
{
|
|
remove_invariant_phi (region, psi);
|
|
return false;
|
|
}
|
|
|
|
/* All the other cases are considered reductions. */
|
|
return true;
|
|
}
|
|
|
|
/* Returns true when BB will be represented in graphite. Return false
|
|
for the basic blocks that contain code eliminated in the code
|
|
generation pass: i.e. induction variables and exit conditions. */
|
|
|
|
static bool
|
|
graphite_stmt_p (sese region, basic_block bb,
|
|
VEC (data_reference_p, heap) *drs)
|
|
{
|
|
gimple_stmt_iterator gsi;
|
|
loop_p loop = bb->loop_father;
|
|
|
|
if (VEC_length (data_reference_p, drs) > 0)
|
|
return true;
|
|
|
|
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
|
|
{
|
|
gimple stmt = gsi_stmt (gsi);
|
|
|
|
switch (gimple_code (stmt))
|
|
{
|
|
/* Control flow expressions can be ignored, as they are
|
|
represented in the iteration domains and will be
|
|
regenerated by graphite. */
|
|
case GIMPLE_COND:
|
|
case GIMPLE_GOTO:
|
|
case GIMPLE_SWITCH:
|
|
break;
|
|
|
|
case GIMPLE_ASSIGN:
|
|
{
|
|
tree var = gimple_assign_lhs (stmt);
|
|
|
|
/* We need these bbs to be able to construct the phi nodes. */
|
|
if (var_used_in_not_loop_header_phi_node (var))
|
|
return true;
|
|
|
|
var = scalar_evolution_in_region (region, loop, var);
|
|
if (chrec_contains_undetermined (var))
|
|
return true;
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Store the GRAPHITE representation of BB. */
|
|
|
|
static gimple_bb_p
|
|
new_gimple_bb (basic_block bb, VEC (data_reference_p, heap) *drs)
|
|
{
|
|
struct gimple_bb *gbb;
|
|
|
|
gbb = XNEW (struct gimple_bb);
|
|
bb->aux = gbb;
|
|
GBB_BB (gbb) = bb;
|
|
GBB_DATA_REFS (gbb) = drs;
|
|
GBB_CONDITIONS (gbb) = NULL;
|
|
GBB_CONDITION_CASES (gbb) = NULL;
|
|
GBB_CLOOG_IV_TYPES (gbb) = NULL;
|
|
|
|
return gbb;
|
|
}
|
|
|
|
/* Frees GBB. */
|
|
|
|
static void
|
|
free_gimple_bb (struct gimple_bb *gbb)
|
|
{
|
|
if (GBB_CLOOG_IV_TYPES (gbb))
|
|
htab_delete (GBB_CLOOG_IV_TYPES (gbb));
|
|
|
|
free_data_refs (GBB_DATA_REFS (gbb));
|
|
|
|
VEC_free (gimple, heap, GBB_CONDITIONS (gbb));
|
|
VEC_free (gimple, heap, GBB_CONDITION_CASES (gbb));
|
|
GBB_BB (gbb)->aux = 0;
|
|
XDELETE (gbb);
|
|
}
|
|
|
|
/* Deletes all gimple bbs in SCOP. */
|
|
|
|
static void
|
|
remove_gbbs_in_scop (scop_p scop)
|
|
{
|
|
int i;
|
|
poly_bb_p pbb;
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
free_gimple_bb (PBB_BLACK_BOX (pbb));
|
|
}
|
|
|
|
/* Deletes all scops in SCOPS. */
|
|
|
|
void
|
|
free_scops (VEC (scop_p, heap) *scops)
|
|
{
|
|
int i;
|
|
scop_p scop;
|
|
|
|
for (i = 0; VEC_iterate (scop_p, scops, i, scop); i++)
|
|
{
|
|
remove_gbbs_in_scop (scop);
|
|
free_sese (SCOP_REGION (scop));
|
|
free_scop (scop);
|
|
}
|
|
|
|
VEC_free (scop_p, heap, scops);
|
|
}
|
|
|
|
/* Generates a polyhedral black box only if the bb contains interesting
|
|
information. */
|
|
|
|
static void
|
|
try_generate_gimple_bb (scop_p scop, basic_block bb)
|
|
{
|
|
VEC (data_reference_p, heap) *drs = VEC_alloc (data_reference_p, heap, 5);
|
|
loop_p nest = outermost_loop_in_sese (SCOP_REGION (scop), bb);
|
|
gimple_stmt_iterator gsi;
|
|
|
|
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
|
|
graphite_find_data_references_in_stmt (nest, gsi_stmt (gsi), &drs);
|
|
|
|
if (!graphite_stmt_p (SCOP_REGION (scop), bb, drs))
|
|
free_data_refs (drs);
|
|
else
|
|
new_poly_bb (scop, new_gimple_bb (bb, drs));
|
|
}
|
|
|
|
/* Returns true if all predecessors of BB, that are not dominated by BB, are
|
|
marked in MAP. The predecessors dominated by BB are loop latches and will
|
|
be handled after BB. */
|
|
|
|
static bool
|
|
all_non_dominated_preds_marked_p (basic_block bb, sbitmap map)
|
|
{
|
|
edge e;
|
|
edge_iterator ei;
|
|
|
|
FOR_EACH_EDGE (e, ei, bb->preds)
|
|
if (!TEST_BIT (map, e->src->index)
|
|
&& !dominated_by_p (CDI_DOMINATORS, e->src, bb))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Compare the depth of two basic_block's P1 and P2. */
|
|
|
|
static int
|
|
compare_bb_depths (const void *p1, const void *p2)
|
|
{
|
|
const_basic_block const bb1 = *(const_basic_block const*)p1;
|
|
const_basic_block const bb2 = *(const_basic_block const*)p2;
|
|
int d1 = loop_depth (bb1->loop_father);
|
|
int d2 = loop_depth (bb2->loop_father);
|
|
|
|
if (d1 < d2)
|
|
return 1;
|
|
|
|
if (d1 > d2)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Sort the basic blocks from DOM such that the first are the ones at
|
|
a deepest loop level. */
|
|
|
|
static void
|
|
graphite_sort_dominated_info (VEC (basic_block, heap) *dom)
|
|
{
|
|
size_t len = VEC_length (basic_block, dom);
|
|
|
|
qsort (VEC_address (basic_block, dom), len, sizeof (basic_block),
|
|
compare_bb_depths);
|
|
}
|
|
|
|
/* Recursive helper function for build_scops_bbs. */
|
|
|
|
static void
|
|
build_scop_bbs_1 (scop_p scop, sbitmap visited, basic_block bb)
|
|
{
|
|
sese region = SCOP_REGION (scop);
|
|
VEC (basic_block, heap) *dom;
|
|
|
|
if (TEST_BIT (visited, bb->index)
|
|
|| !bb_in_sese_p (bb, region))
|
|
return;
|
|
|
|
try_generate_gimple_bb (scop, bb);
|
|
SET_BIT (visited, bb->index);
|
|
|
|
dom = get_dominated_by (CDI_DOMINATORS, bb);
|
|
|
|
if (dom == NULL)
|
|
return;
|
|
|
|
graphite_sort_dominated_info (dom);
|
|
|
|
while (!VEC_empty (basic_block, dom))
|
|
{
|
|
int i;
|
|
basic_block dom_bb;
|
|
|
|
for (i = 0; VEC_iterate (basic_block, dom, i, dom_bb); i++)
|
|
if (all_non_dominated_preds_marked_p (dom_bb, visited))
|
|
{
|
|
build_scop_bbs_1 (scop, visited, dom_bb);
|
|
VEC_unordered_remove (basic_block, dom, i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
VEC_free (basic_block, heap, dom);
|
|
}
|
|
|
|
/* Gather the basic blocks belonging to the SCOP. */
|
|
|
|
void
|
|
build_scop_bbs (scop_p scop)
|
|
{
|
|
sbitmap visited = sbitmap_alloc (last_basic_block);
|
|
sese region = SCOP_REGION (scop);
|
|
|
|
sbitmap_zero (visited);
|
|
build_scop_bbs_1 (scop, visited, SESE_ENTRY_BB (region));
|
|
|
|
sbitmap_free (visited);
|
|
}
|
|
|
|
/* Converts the STATIC_SCHEDULE of PBB into a scattering polyhedron.
|
|
We generate SCATTERING_DIMENSIONS scattering dimensions.
|
|
|
|
CLooG 0.15.0 and previous versions require, that all
|
|
scattering functions of one CloogProgram have the same number of
|
|
scattering dimensions, therefore we allow to specify it. This
|
|
should be removed in future versions of CLooG.
|
|
|
|
The scattering polyhedron consists of these dimensions: scattering,
|
|
loop_iterators, parameters.
|
|
|
|
Example:
|
|
|
|
| scattering_dimensions = 5
|
|
| used_scattering_dimensions = 3
|
|
| nb_iterators = 1
|
|
| scop_nb_params = 2
|
|
|
|
|
| Schedule:
|
|
| i
|
|
| 4 5
|
|
|
|
|
| Scattering polyhedron:
|
|
|
|
|
| scattering: {s1, s2, s3, s4, s5}
|
|
| loop_iterators: {i}
|
|
| parameters: {p1, p2}
|
|
|
|
|
| s1 s2 s3 s4 s5 i p1 p2 1
|
|
| 1 0 0 0 0 0 0 0 -4 = 0
|
|
| 0 1 0 0 0 -1 0 0 0 = 0
|
|
| 0 0 1 0 0 0 0 0 -5 = 0 */
|
|
|
|
static void
|
|
build_pbb_scattering_polyhedrons (ppl_Linear_Expression_t static_schedule,
|
|
poly_bb_p pbb, int scattering_dimensions)
|
|
{
|
|
int i;
|
|
scop_p scop = PBB_SCOP (pbb);
|
|
int nb_iterators = pbb_dim_iter_domain (pbb);
|
|
int used_scattering_dimensions = nb_iterators * 2 + 1;
|
|
int nb_params = scop_nb_params (scop);
|
|
ppl_Coefficient_t c;
|
|
ppl_dimension_type dim = scattering_dimensions + nb_iterators + nb_params;
|
|
Value v;
|
|
|
|
gcc_assert (scattering_dimensions >= used_scattering_dimensions);
|
|
|
|
value_init (v);
|
|
ppl_new_Coefficient (&c);
|
|
PBB_TRANSFORMED (pbb) = poly_scattering_new ();
|
|
ppl_new_C_Polyhedron_from_space_dimension
|
|
(&PBB_TRANSFORMED_SCATTERING (pbb), dim, 0);
|
|
|
|
PBB_NB_SCATTERING_TRANSFORM (pbb) = scattering_dimensions;
|
|
|
|
for (i = 0; i < scattering_dimensions; i++)
|
|
{
|
|
ppl_Constraint_t cstr;
|
|
ppl_Linear_Expression_t expr;
|
|
|
|
ppl_new_Linear_Expression_with_dimension (&expr, dim);
|
|
value_set_si (v, 1);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_coefficient (expr, i, c);
|
|
|
|
/* Textual order inside this loop. */
|
|
if ((i % 2) == 0)
|
|
{
|
|
ppl_Linear_Expression_coefficient (static_schedule, i / 2, c);
|
|
ppl_Coefficient_to_mpz_t (c, v);
|
|
value_oppose (v, v);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_inhomogeneous (expr, c);
|
|
}
|
|
|
|
/* Iterations of this loop. */
|
|
else /* if ((i % 2) == 1) */
|
|
{
|
|
int loop = (i - 1) / 2;
|
|
|
|
value_set_si (v, -1);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_coefficient
|
|
(expr, scattering_dimensions + loop, c);
|
|
}
|
|
|
|
ppl_new_Constraint (&cstr, expr, PPL_CONSTRAINT_TYPE_EQUAL);
|
|
ppl_Polyhedron_add_constraint (PBB_TRANSFORMED_SCATTERING (pbb), cstr);
|
|
ppl_delete_Linear_Expression (expr);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
|
|
value_clear (v);
|
|
ppl_delete_Coefficient (c);
|
|
|
|
PBB_ORIGINAL (pbb) = poly_scattering_copy (PBB_TRANSFORMED (pbb));
|
|
}
|
|
|
|
/* Build for BB the static schedule.
|
|
|
|
The static schedule is a Dewey numbering of the abstract syntax
|
|
tree: http://en.wikipedia.org/wiki/Dewey_Decimal_Classification
|
|
|
|
The following example informally defines the static schedule:
|
|
|
|
A
|
|
for (i: ...)
|
|
{
|
|
for (j: ...)
|
|
{
|
|
B
|
|
C
|
|
}
|
|
|
|
for (k: ...)
|
|
{
|
|
D
|
|
E
|
|
}
|
|
}
|
|
F
|
|
|
|
Static schedules for A to F:
|
|
|
|
DEPTH
|
|
0 1 2
|
|
A 0
|
|
B 1 0 0
|
|
C 1 0 1
|
|
D 1 1 0
|
|
E 1 1 1
|
|
F 2
|
|
*/
|
|
|
|
static void
|
|
build_scop_scattering (scop_p scop)
|
|
{
|
|
int i;
|
|
poly_bb_p pbb;
|
|
gimple_bb_p previous_gbb = NULL;
|
|
ppl_Linear_Expression_t static_schedule;
|
|
ppl_Coefficient_t c;
|
|
Value v;
|
|
|
|
value_init (v);
|
|
ppl_new_Coefficient (&c);
|
|
ppl_new_Linear_Expression (&static_schedule);
|
|
|
|
/* We have to start schedules at 0 on the first component and
|
|
because we cannot compare_prefix_loops against a previous loop,
|
|
prefix will be equal to zero, and that index will be
|
|
incremented before copying. */
|
|
value_set_si (v, -1);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_coefficient (static_schedule, 0, c);
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
{
|
|
gimple_bb_p gbb = PBB_BLACK_BOX (pbb);
|
|
ppl_Linear_Expression_t common;
|
|
int prefix;
|
|
int nb_scat_dims = pbb_dim_iter_domain (pbb) * 2 + 1;
|
|
|
|
if (previous_gbb)
|
|
prefix = nb_common_loops (SCOP_REGION (scop), previous_gbb, gbb);
|
|
else
|
|
prefix = 0;
|
|
|
|
previous_gbb = gbb;
|
|
ppl_new_Linear_Expression_with_dimension (&common, prefix + 1);
|
|
ppl_assign_Linear_Expression_from_Linear_Expression (common,
|
|
static_schedule);
|
|
|
|
value_set_si (v, 1);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_coefficient (common, prefix, c);
|
|
ppl_assign_Linear_Expression_from_Linear_Expression (static_schedule,
|
|
common);
|
|
|
|
build_pbb_scattering_polyhedrons (common, pbb, nb_scat_dims);
|
|
|
|
ppl_delete_Linear_Expression (common);
|
|
}
|
|
|
|
value_clear (v);
|
|
ppl_delete_Coefficient (c);
|
|
ppl_delete_Linear_Expression (static_schedule);
|
|
}
|
|
|
|
/* Add the value K to the dimension D of the linear expression EXPR. */
|
|
|
|
static void
|
|
add_value_to_dim (ppl_dimension_type d, ppl_Linear_Expression_t expr,
|
|
Value k)
|
|
{
|
|
Value val;
|
|
ppl_Coefficient_t coef;
|
|
|
|
ppl_new_Coefficient (&coef);
|
|
ppl_Linear_Expression_coefficient (expr, d, coef);
|
|
value_init (val);
|
|
ppl_Coefficient_to_mpz_t (coef, val);
|
|
|
|
value_addto (val, val, k);
|
|
|
|
ppl_assign_Coefficient_from_mpz_t (coef, val);
|
|
ppl_Linear_Expression_add_to_coefficient (expr, d, coef);
|
|
value_clear (val);
|
|
ppl_delete_Coefficient (coef);
|
|
}
|
|
|
|
/* In the context of scop S, scan E, the right hand side of a scalar
|
|
evolution function in loop VAR, and translate it to a linear
|
|
expression EXPR. */
|
|
|
|
static void
|
|
scan_tree_for_params_right_scev (sese s, tree e, int var,
|
|
ppl_Linear_Expression_t expr)
|
|
{
|
|
if (expr)
|
|
{
|
|
loop_p loop = get_loop (var);
|
|
ppl_dimension_type l = sese_loop_depth (s, loop) - 1;
|
|
Value val;
|
|
|
|
/* Scalar evolutions should happen in the sese region. */
|
|
gcc_assert (sese_loop_depth (s, loop) > 0);
|
|
|
|
/* We can not deal with parametric strides like:
|
|
|
|
| p = parameter;
|
|
|
|
|
| for i:
|
|
| a [i * p] = ... */
|
|
gcc_assert (TREE_CODE (e) == INTEGER_CST);
|
|
|
|
value_init (val);
|
|
value_set_si (val, int_cst_value (e));
|
|
add_value_to_dim (l, expr, val);
|
|
value_clear (val);
|
|
}
|
|
}
|
|
|
|
/* Scan the integer constant CST, and add it to the inhomogeneous part of the
|
|
linear expression EXPR. K is the multiplier of the constant. */
|
|
|
|
static void
|
|
scan_tree_for_params_int (tree cst, ppl_Linear_Expression_t expr, Value k)
|
|
{
|
|
Value val;
|
|
ppl_Coefficient_t coef;
|
|
int v = int_cst_value (cst);
|
|
|
|
value_init (val);
|
|
value_set_si (val, 0);
|
|
|
|
/* Necessary to not get "-1 = 2^n - 1". */
|
|
if (v < 0)
|
|
value_sub_int (val, val, -v);
|
|
else
|
|
value_add_int (val, val, v);
|
|
|
|
value_multiply (val, val, k);
|
|
ppl_new_Coefficient (&coef);
|
|
ppl_assign_Coefficient_from_mpz_t (coef, val);
|
|
ppl_Linear_Expression_add_to_inhomogeneous (expr, coef);
|
|
value_clear (val);
|
|
ppl_delete_Coefficient (coef);
|
|
}
|
|
|
|
/* Saves in NV at index I a new name for variable P. */
|
|
|
|
static void
|
|
save_var_name (char **nv, int i, tree p)
|
|
{
|
|
const char *name = get_name (SSA_NAME_VAR (p));
|
|
|
|
if (name)
|
|
{
|
|
int len = strlen (name) + 16;
|
|
nv[i] = XNEWVEC (char, len);
|
|
snprintf (nv[i], len, "%s_%d", name, SSA_NAME_VERSION (p));
|
|
}
|
|
else
|
|
{
|
|
nv[i] = XNEWVEC (char, 16);
|
|
snprintf (nv[i], 2 + 16, "T_%d", SSA_NAME_VERSION (p));
|
|
}
|
|
}
|
|
|
|
/* When parameter NAME is in REGION, returns its index in SESE_PARAMS.
|
|
Otherwise returns -1. */
|
|
|
|
static inline int
|
|
parameter_index_in_region_1 (tree name, sese region)
|
|
{
|
|
int i;
|
|
tree p;
|
|
|
|
gcc_assert (TREE_CODE (name) == SSA_NAME);
|
|
|
|
for (i = 0; VEC_iterate (tree, SESE_PARAMS (region), i, p); i++)
|
|
if (p == name)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* When the parameter NAME is in REGION, returns its index in
|
|
SESE_PARAMS. Otherwise this function inserts NAME in SESE_PARAMS
|
|
and returns the index of NAME. */
|
|
|
|
static int
|
|
parameter_index_in_region (tree name, sese region)
|
|
{
|
|
int i;
|
|
|
|
gcc_assert (TREE_CODE (name) == SSA_NAME);
|
|
|
|
i = parameter_index_in_region_1 (name, region);
|
|
if (i != -1)
|
|
return i;
|
|
|
|
gcc_assert (SESE_ADD_PARAMS (region));
|
|
|
|
i = VEC_length (tree, SESE_PARAMS (region));
|
|
save_var_name (SESE_PARAMS_NAMES (region), i, name);
|
|
save_clast_name_index (SESE_PARAMS_INDEX (region),
|
|
SESE_PARAMS_NAMES (region)[i], i);
|
|
VEC_safe_push (tree, heap, SESE_PARAMS (region), name);
|
|
return i;
|
|
}
|
|
|
|
/* In the context of sese S, scan the expression E and translate it to
|
|
a linear expression C. When parsing a symbolic multiplication, K
|
|
represents the constant multiplier of an expression containing
|
|
parameters. */
|
|
|
|
static void
|
|
scan_tree_for_params (sese s, tree e, ppl_Linear_Expression_t c,
|
|
Value k)
|
|
{
|
|
if (e == chrec_dont_know)
|
|
return;
|
|
|
|
switch (TREE_CODE (e))
|
|
{
|
|
case POLYNOMIAL_CHREC:
|
|
scan_tree_for_params_right_scev (s, CHREC_RIGHT (e),
|
|
CHREC_VARIABLE (e), c);
|
|
scan_tree_for_params (s, CHREC_LEFT (e), c, k);
|
|
break;
|
|
|
|
case MULT_EXPR:
|
|
if (chrec_contains_symbols (TREE_OPERAND (e, 0)))
|
|
{
|
|
if (c)
|
|
{
|
|
Value val;
|
|
gcc_assert (host_integerp (TREE_OPERAND (e, 1), 0));
|
|
value_init (val);
|
|
value_set_si (val, int_cst_value (TREE_OPERAND (e, 1)));
|
|
value_multiply (val, val, k);
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), c, val);
|
|
value_clear (val);
|
|
}
|
|
else
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), c, k);
|
|
}
|
|
else
|
|
{
|
|
if (c)
|
|
{
|
|
Value val;
|
|
gcc_assert (host_integerp (TREE_OPERAND (e, 0), 0));
|
|
value_init (val);
|
|
value_set_si (val, int_cst_value (TREE_OPERAND (e, 0)));
|
|
value_multiply (val, val, k);
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 1), c, val);
|
|
value_clear (val);
|
|
}
|
|
else
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 1), c, k);
|
|
}
|
|
break;
|
|
|
|
case PLUS_EXPR:
|
|
case POINTER_PLUS_EXPR:
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), c, k);
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 1), c, k);
|
|
break;
|
|
|
|
case MINUS_EXPR:
|
|
{
|
|
ppl_Linear_Expression_t tmp_expr = NULL;
|
|
|
|
if (c)
|
|
{
|
|
ppl_dimension_type dim;
|
|
ppl_Linear_Expression_space_dimension (c, &dim);
|
|
ppl_new_Linear_Expression_with_dimension (&tmp_expr, dim);
|
|
}
|
|
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), c, k);
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 1), tmp_expr, k);
|
|
|
|
if (c)
|
|
{
|
|
ppl_subtract_Linear_Expression_from_Linear_Expression (c,
|
|
tmp_expr);
|
|
ppl_delete_Linear_Expression (tmp_expr);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case NEGATE_EXPR:
|
|
{
|
|
ppl_Linear_Expression_t tmp_expr = NULL;
|
|
|
|
if (c)
|
|
{
|
|
ppl_dimension_type dim;
|
|
ppl_Linear_Expression_space_dimension (c, &dim);
|
|
ppl_new_Linear_Expression_with_dimension (&tmp_expr, dim);
|
|
}
|
|
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), tmp_expr, k);
|
|
|
|
if (c)
|
|
{
|
|
ppl_subtract_Linear_Expression_from_Linear_Expression (c,
|
|
tmp_expr);
|
|
ppl_delete_Linear_Expression (tmp_expr);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case BIT_NOT_EXPR:
|
|
{
|
|
ppl_Linear_Expression_t tmp_expr = NULL;
|
|
|
|
if (c)
|
|
{
|
|
ppl_dimension_type dim;
|
|
ppl_Linear_Expression_space_dimension (c, &dim);
|
|
ppl_new_Linear_Expression_with_dimension (&tmp_expr, dim);
|
|
}
|
|
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), tmp_expr, k);
|
|
|
|
if (c)
|
|
{
|
|
ppl_Coefficient_t coef;
|
|
Value minus_one;
|
|
|
|
ppl_subtract_Linear_Expression_from_Linear_Expression (c,
|
|
tmp_expr);
|
|
ppl_delete_Linear_Expression (tmp_expr);
|
|
value_init (minus_one);
|
|
value_set_si (minus_one, -1);
|
|
ppl_new_Coefficient_from_mpz_t (&coef, minus_one);
|
|
ppl_Linear_Expression_add_to_inhomogeneous (c, coef);
|
|
value_clear (minus_one);
|
|
ppl_delete_Coefficient (coef);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case SSA_NAME:
|
|
{
|
|
ppl_dimension_type p = parameter_index_in_region (e, s);
|
|
|
|
if (c)
|
|
{
|
|
ppl_dimension_type dim;
|
|
ppl_Linear_Expression_space_dimension (c, &dim);
|
|
p += dim - sese_nb_params (s);
|
|
add_value_to_dim (p, c, k);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case INTEGER_CST:
|
|
if (c)
|
|
scan_tree_for_params_int (e, c, k);
|
|
break;
|
|
|
|
CASE_CONVERT:
|
|
case NON_LVALUE_EXPR:
|
|
scan_tree_for_params (s, TREE_OPERAND (e, 0), c, k);
|
|
break;
|
|
|
|
default:
|
|
gcc_unreachable ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Data structure for idx_record_params. */
|
|
|
|
struct irp_data
|
|
{
|
|
struct loop *loop;
|
|
sese region;
|
|
};
|
|
|
|
/* For a data reference with an ARRAY_REF as its BASE, record the
|
|
parameters occurring in IDX. DTA is passed in as complementary
|
|
information, and is used by the automatic walker function. This
|
|
function is a callback for for_each_index. */
|
|
|
|
static bool
|
|
idx_record_params (tree base, tree *idx, void *dta)
|
|
{
|
|
struct irp_data *data = (struct irp_data *) dta;
|
|
|
|
if (TREE_CODE (base) != ARRAY_REF)
|
|
return true;
|
|
|
|
if (TREE_CODE (*idx) == SSA_NAME)
|
|
{
|
|
tree scev;
|
|
sese region = data->region;
|
|
struct loop *loop = data->loop;
|
|
Value one;
|
|
|
|
scev = scalar_evolution_in_region (region, loop, *idx);
|
|
|
|
value_init (one);
|
|
value_set_si (one, 1);
|
|
scan_tree_for_params (region, scev, NULL, one);
|
|
value_clear (one);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Find parameters with respect to REGION in BB. We are looking in memory
|
|
access functions, conditions and loop bounds. */
|
|
|
|
static void
|
|
find_params_in_bb (sese region, gimple_bb_p gbb)
|
|
{
|
|
int i;
|
|
data_reference_p dr;
|
|
gimple stmt;
|
|
loop_p loop = GBB_BB (gbb)->loop_father;
|
|
|
|
for (i = 0; VEC_iterate (data_reference_p, GBB_DATA_REFS (gbb), i, dr); i++)
|
|
{
|
|
struct irp_data irp;
|
|
|
|
irp.loop = loop;
|
|
irp.region = region;
|
|
for_each_index (&dr->ref, idx_record_params, &irp);
|
|
}
|
|
|
|
/* Find parameters in conditional statements. */
|
|
for (i = 0; VEC_iterate (gimple, GBB_CONDITIONS (gbb), i, stmt); i++)
|
|
{
|
|
Value one;
|
|
tree lhs = scalar_evolution_in_region (region, loop,
|
|
gimple_cond_lhs (stmt));
|
|
tree rhs = scalar_evolution_in_region (region, loop,
|
|
gimple_cond_rhs (stmt));
|
|
|
|
value_init (one);
|
|
value_set_si (one, 1);
|
|
scan_tree_for_params (region, lhs, NULL, one);
|
|
scan_tree_for_params (region, rhs, NULL, one);
|
|
value_clear (one);
|
|
}
|
|
}
|
|
|
|
/* Record the parameters used in the SCOP. A variable is a parameter
|
|
in a scop if it does not vary during the execution of that scop. */
|
|
|
|
static void
|
|
find_scop_parameters (scop_p scop)
|
|
{
|
|
poly_bb_p pbb;
|
|
unsigned i;
|
|
sese region = SCOP_REGION (scop);
|
|
struct loop *loop;
|
|
Value one;
|
|
|
|
value_init (one);
|
|
value_set_si (one, 1);
|
|
|
|
/* Find the parameters used in the loop bounds. */
|
|
for (i = 0; VEC_iterate (loop_p, SESE_LOOP_NEST (region), i, loop); i++)
|
|
{
|
|
tree nb_iters = number_of_latch_executions (loop);
|
|
|
|
if (!chrec_contains_symbols (nb_iters))
|
|
continue;
|
|
|
|
nb_iters = scalar_evolution_in_region (region, loop, nb_iters);
|
|
scan_tree_for_params (region, nb_iters, NULL, one);
|
|
}
|
|
|
|
value_clear (one);
|
|
|
|
/* Find the parameters used in data accesses. */
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
find_params_in_bb (region, PBB_BLACK_BOX (pbb));
|
|
|
|
scop_set_nb_params (scop, sese_nb_params (region));
|
|
SESE_ADD_PARAMS (region) = false;
|
|
}
|
|
|
|
/* Returns a gimple_bb from BB. */
|
|
|
|
static inline gimple_bb_p
|
|
gbb_from_bb (basic_block bb)
|
|
{
|
|
return (gimple_bb_p) bb->aux;
|
|
}
|
|
|
|
/* Builds the constraint polyhedra for LOOP in SCOP. OUTER_PH gives
|
|
the constraints for the surrounding loops. */
|
|
|
|
static void
|
|
build_loop_iteration_domains (scop_p scop, struct loop *loop,
|
|
ppl_Polyhedron_t outer_ph, int nb)
|
|
|
|
{
|
|
int i;
|
|
ppl_Polyhedron_t ph;
|
|
tree nb_iters = number_of_latch_executions (loop);
|
|
ppl_dimension_type dim = nb + 1 + scop_nb_params (scop);
|
|
sese region = SCOP_REGION (scop);
|
|
|
|
{
|
|
ppl_const_Constraint_System_t pcs;
|
|
ppl_dimension_type *map
|
|
= (ppl_dimension_type *) XNEWVEC (ppl_dimension_type, dim);
|
|
|
|
ppl_new_C_Polyhedron_from_space_dimension (&ph, dim, 0);
|
|
ppl_Polyhedron_get_constraints (outer_ph, &pcs);
|
|
ppl_Polyhedron_add_constraints (ph, pcs);
|
|
|
|
for (i = 0; i < (int) nb; i++)
|
|
map[i] = i;
|
|
for (i = (int) nb; i < (int) dim - 1; i++)
|
|
map[i] = i + 1;
|
|
map[dim - 1] = nb;
|
|
|
|
ppl_Polyhedron_map_space_dimensions (ph, map, dim);
|
|
free (map);
|
|
}
|
|
|
|
/* 0 <= loop_i */
|
|
{
|
|
ppl_Constraint_t lb;
|
|
ppl_Linear_Expression_t lb_expr;
|
|
|
|
ppl_new_Linear_Expression_with_dimension (&lb_expr, dim);
|
|
ppl_set_coef (lb_expr, nb, 1);
|
|
ppl_new_Constraint (&lb, lb_expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_delete_Linear_Expression (lb_expr);
|
|
ppl_Polyhedron_add_constraint (ph, lb);
|
|
ppl_delete_Constraint (lb);
|
|
}
|
|
|
|
if (TREE_CODE (nb_iters) == INTEGER_CST)
|
|
{
|
|
ppl_Constraint_t ub;
|
|
ppl_Linear_Expression_t ub_expr;
|
|
|
|
ppl_new_Linear_Expression_with_dimension (&ub_expr, dim);
|
|
|
|
/* loop_i <= cst_nb_iters */
|
|
ppl_set_coef (ub_expr, nb, -1);
|
|
ppl_set_inhomogeneous_tree (ub_expr, nb_iters);
|
|
ppl_new_Constraint (&ub, ub_expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (ph, ub);
|
|
ppl_delete_Linear_Expression (ub_expr);
|
|
ppl_delete_Constraint (ub);
|
|
}
|
|
else if (!chrec_contains_undetermined (nb_iters))
|
|
{
|
|
Value one;
|
|
ppl_Constraint_t ub;
|
|
ppl_Linear_Expression_t ub_expr;
|
|
|
|
value_init (one);
|
|
value_set_si (one, 1);
|
|
ppl_new_Linear_Expression_with_dimension (&ub_expr, dim);
|
|
nb_iters = scalar_evolution_in_region (region, loop, nb_iters);
|
|
scan_tree_for_params (SCOP_REGION (scop), nb_iters, ub_expr, one);
|
|
value_clear (one);
|
|
|
|
/* loop_i <= expr_nb_iters */
|
|
ppl_set_coef (ub_expr, nb, -1);
|
|
ppl_new_Constraint (&ub, ub_expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (ph, ub);
|
|
ppl_delete_Linear_Expression (ub_expr);
|
|
ppl_delete_Constraint (ub);
|
|
}
|
|
else
|
|
gcc_unreachable ();
|
|
|
|
if (loop->inner && loop_in_sese_p (loop->inner, region))
|
|
build_loop_iteration_domains (scop, loop->inner, ph, nb + 1);
|
|
|
|
if (nb != 0
|
|
&& loop->next
|
|
&& loop_in_sese_p (loop->next, region))
|
|
build_loop_iteration_domains (scop, loop->next, outer_ph, nb);
|
|
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
|
|
((ppl_Pointset_Powerset_C_Polyhedron_t *) &loop->aux, ph);
|
|
|
|
ppl_delete_Polyhedron (ph);
|
|
}
|
|
|
|
/* Returns a linear expression for tree T evaluated in PBB. */
|
|
|
|
static ppl_Linear_Expression_t
|
|
create_linear_expr_from_tree (poly_bb_p pbb, tree t)
|
|
{
|
|
Value one;
|
|
ppl_Linear_Expression_t res;
|
|
ppl_dimension_type dim;
|
|
sese region = SCOP_REGION (PBB_SCOP (pbb));
|
|
loop_p loop = GBB_BB (PBB_BLACK_BOX (pbb))->loop_father;
|
|
|
|
dim = pbb_dim_iter_domain (pbb) + pbb_nb_params (pbb);
|
|
ppl_new_Linear_Expression_with_dimension (&res, dim);
|
|
|
|
t = scalar_evolution_in_region (region, loop, t);
|
|
gcc_assert (!automatically_generated_chrec_p (t));
|
|
|
|
value_init (one);
|
|
value_set_si (one, 1);
|
|
scan_tree_for_params (region, t, res, one);
|
|
value_clear (one);
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Returns the ppl constraint type from the gimple tree code CODE. */
|
|
|
|
static enum ppl_enum_Constraint_Type
|
|
ppl_constraint_type_from_tree_code (enum tree_code code)
|
|
{
|
|
switch (code)
|
|
{
|
|
/* We do not support LT and GT to be able to work with C_Polyhedron.
|
|
As we work on integer polyhedron "a < b" can be expressed by
|
|
"a + 1 <= b". */
|
|
case LT_EXPR:
|
|
case GT_EXPR:
|
|
gcc_unreachable ();
|
|
|
|
case LE_EXPR:
|
|
return PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL;
|
|
|
|
case GE_EXPR:
|
|
return PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL;
|
|
|
|
case EQ_EXPR:
|
|
return PPL_CONSTRAINT_TYPE_EQUAL;
|
|
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
}
|
|
|
|
/* Add conditional statement STMT to PS. It is evaluated in PBB and
|
|
CODE is used as the comparison operator. This allows us to invert the
|
|
condition or to handle inequalities. */
|
|
|
|
static void
|
|
add_condition_to_domain (ppl_Pointset_Powerset_C_Polyhedron_t ps, gimple stmt,
|
|
poly_bb_p pbb, enum tree_code code)
|
|
{
|
|
Value v;
|
|
ppl_Coefficient_t c;
|
|
ppl_Linear_Expression_t left, right;
|
|
ppl_Constraint_t cstr;
|
|
enum ppl_enum_Constraint_Type type;
|
|
|
|
left = create_linear_expr_from_tree (pbb, gimple_cond_lhs (stmt));
|
|
right = create_linear_expr_from_tree (pbb, gimple_cond_rhs (stmt));
|
|
|
|
/* If we have < or > expressions convert them to <= or >= by adding 1 to
|
|
the left or the right side of the expression. */
|
|
if (code == LT_EXPR)
|
|
{
|
|
value_init (v);
|
|
value_set_si (v, 1);
|
|
ppl_new_Coefficient (&c);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_inhomogeneous (left, c);
|
|
ppl_delete_Coefficient (c);
|
|
value_clear (v);
|
|
|
|
code = LE_EXPR;
|
|
}
|
|
else if (code == GT_EXPR)
|
|
{
|
|
value_init (v);
|
|
value_set_si (v, 1);
|
|
ppl_new_Coefficient (&c);
|
|
ppl_assign_Coefficient_from_mpz_t (c, v);
|
|
ppl_Linear_Expression_add_to_inhomogeneous (right, c);
|
|
ppl_delete_Coefficient (c);
|
|
value_clear (v);
|
|
|
|
code = GE_EXPR;
|
|
}
|
|
|
|
type = ppl_constraint_type_from_tree_code (code);
|
|
|
|
ppl_subtract_Linear_Expression_from_Linear_Expression (left, right);
|
|
|
|
ppl_new_Constraint (&cstr, left, type);
|
|
ppl_Pointset_Powerset_C_Polyhedron_add_constraint (ps, cstr);
|
|
|
|
ppl_delete_Constraint (cstr);
|
|
ppl_delete_Linear_Expression (left);
|
|
ppl_delete_Linear_Expression (right);
|
|
}
|
|
|
|
/* Add conditional statement STMT to pbb. CODE is used as the comparision
|
|
operator. This allows us to invert the condition or to handle
|
|
inequalities. */
|
|
|
|
static void
|
|
add_condition_to_pbb (poly_bb_p pbb, gimple stmt, enum tree_code code)
|
|
{
|
|
if (code == NE_EXPR)
|
|
{
|
|
ppl_Pointset_Powerset_C_Polyhedron_t left = PBB_DOMAIN (pbb);
|
|
ppl_Pointset_Powerset_C_Polyhedron_t right;
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
|
|
(&right, left);
|
|
add_condition_to_domain (left, stmt, pbb, LT_EXPR);
|
|
add_condition_to_domain (right, stmt, pbb, GT_EXPR);
|
|
ppl_Pointset_Powerset_C_Polyhedron_upper_bound_assign (left,
|
|
right);
|
|
ppl_delete_Pointset_Powerset_C_Polyhedron (right);
|
|
}
|
|
else
|
|
add_condition_to_domain (PBB_DOMAIN (pbb), stmt, pbb, code);
|
|
}
|
|
|
|
/* Add conditions to the domain of PBB. */
|
|
|
|
static void
|
|
add_conditions_to_domain (poly_bb_p pbb)
|
|
{
|
|
unsigned int i;
|
|
gimple stmt;
|
|
gimple_bb_p gbb = PBB_BLACK_BOX (pbb);
|
|
VEC (gimple, heap) *conditions = GBB_CONDITIONS (gbb);
|
|
|
|
if (VEC_empty (gimple, conditions))
|
|
return;
|
|
|
|
for (i = 0; VEC_iterate (gimple, conditions, i, stmt); i++)
|
|
switch (gimple_code (stmt))
|
|
{
|
|
case GIMPLE_COND:
|
|
{
|
|
enum tree_code code = gimple_cond_code (stmt);
|
|
|
|
/* The conditions for ELSE-branches are inverted. */
|
|
if (VEC_index (gimple, gbb->condition_cases, i) == NULL)
|
|
code = invert_tree_comparison (code, false);
|
|
|
|
add_condition_to_pbb (pbb, stmt, code);
|
|
break;
|
|
}
|
|
|
|
case GIMPLE_SWITCH:
|
|
/* Switch statements are not supported right now - fall throught. */
|
|
|
|
default:
|
|
gcc_unreachable ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Structure used to pass data to dom_walk. */
|
|
|
|
struct bsc
|
|
{
|
|
VEC (gimple, heap) **conditions, **cases;
|
|
sese region;
|
|
};
|
|
|
|
/* Returns non NULL when BB has a single predecessor and the last
|
|
statement of that predecessor is a COND_EXPR. */
|
|
|
|
static gimple
|
|
single_pred_cond (basic_block bb)
|
|
{
|
|
if (single_pred_p (bb))
|
|
{
|
|
edge e = single_pred_edge (bb);
|
|
basic_block pred = e->src;
|
|
gimple stmt = last_stmt (pred);
|
|
|
|
if (stmt && gimple_code (stmt) == GIMPLE_COND)
|
|
return stmt;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Call-back for dom_walk executed before visiting the dominated
|
|
blocks. */
|
|
|
|
static void
|
|
build_sese_conditions_before (struct dom_walk_data *dw_data,
|
|
basic_block bb)
|
|
{
|
|
struct bsc *data = (struct bsc *) dw_data->global_data;
|
|
VEC (gimple, heap) **conditions = data->conditions;
|
|
VEC (gimple, heap) **cases = data->cases;
|
|
gimple_bb_p gbb = gbb_from_bb (bb);
|
|
gimple stmt = single_pred_cond (bb);
|
|
|
|
if (!bb_in_sese_p (bb, data->region))
|
|
return;
|
|
|
|
if (stmt)
|
|
{
|
|
edge e = single_pred_edge (bb);
|
|
|
|
VEC_safe_push (gimple, heap, *conditions, stmt);
|
|
|
|
if (e->flags & EDGE_TRUE_VALUE)
|
|
VEC_safe_push (gimple, heap, *cases, stmt);
|
|
else
|
|
VEC_safe_push (gimple, heap, *cases, NULL);
|
|
}
|
|
|
|
if (gbb)
|
|
{
|
|
GBB_CONDITIONS (gbb) = VEC_copy (gimple, heap, *conditions);
|
|
GBB_CONDITION_CASES (gbb) = VEC_copy (gimple, heap, *cases);
|
|
}
|
|
}
|
|
|
|
/* Call-back for dom_walk executed after visiting the dominated
|
|
blocks. */
|
|
|
|
static void
|
|
build_sese_conditions_after (struct dom_walk_data *dw_data,
|
|
basic_block bb)
|
|
{
|
|
struct bsc *data = (struct bsc *) dw_data->global_data;
|
|
VEC (gimple, heap) **conditions = data->conditions;
|
|
VEC (gimple, heap) **cases = data->cases;
|
|
|
|
if (!bb_in_sese_p (bb, data->region))
|
|
return;
|
|
|
|
if (single_pred_cond (bb))
|
|
{
|
|
VEC_pop (gimple, *conditions);
|
|
VEC_pop (gimple, *cases);
|
|
}
|
|
}
|
|
|
|
/* Record all conditions in REGION. */
|
|
|
|
static void
|
|
build_sese_conditions (sese region)
|
|
{
|
|
struct dom_walk_data walk_data;
|
|
VEC (gimple, heap) *conditions = VEC_alloc (gimple, heap, 3);
|
|
VEC (gimple, heap) *cases = VEC_alloc (gimple, heap, 3);
|
|
struct bsc data;
|
|
|
|
data.conditions = &conditions;
|
|
data.cases = &cases;
|
|
data.region = region;
|
|
|
|
walk_data.dom_direction = CDI_DOMINATORS;
|
|
walk_data.initialize_block_local_data = NULL;
|
|
walk_data.before_dom_children = build_sese_conditions_before;
|
|
walk_data.after_dom_children = build_sese_conditions_after;
|
|
walk_data.global_data = &data;
|
|
walk_data.block_local_data_size = 0;
|
|
|
|
init_walk_dominator_tree (&walk_data);
|
|
walk_dominator_tree (&walk_data, SESE_ENTRY_BB (region));
|
|
fini_walk_dominator_tree (&walk_data);
|
|
|
|
VEC_free (gimple, heap, conditions);
|
|
VEC_free (gimple, heap, cases);
|
|
}
|
|
|
|
/* Traverses all the GBBs of the SCOP and add their constraints to the
|
|
iteration domains. */
|
|
|
|
static void
|
|
add_conditions_to_constraints (scop_p scop)
|
|
{
|
|
int i;
|
|
poly_bb_p pbb;
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
add_conditions_to_domain (pbb);
|
|
}
|
|
|
|
/* Add constraints on the possible values of parameter P from the type
|
|
of P. */
|
|
|
|
static void
|
|
add_param_constraints (scop_p scop, ppl_Polyhedron_t context, graphite_dim_t p)
|
|
{
|
|
ppl_Constraint_t cstr;
|
|
ppl_Linear_Expression_t le;
|
|
tree parameter = VEC_index (tree, SESE_PARAMS (SCOP_REGION (scop)), p);
|
|
tree type = TREE_TYPE (parameter);
|
|
tree lb, ub;
|
|
|
|
/* Disabled until we fix CPU2006. */
|
|
return;
|
|
|
|
if (!INTEGRAL_TYPE_P (type))
|
|
return;
|
|
|
|
lb = TYPE_MIN_VALUE (type);
|
|
ub = TYPE_MAX_VALUE (type);
|
|
|
|
if (lb)
|
|
{
|
|
ppl_new_Linear_Expression_with_dimension (&le, scop_nb_params (scop));
|
|
ppl_set_coef (le, p, -1);
|
|
ppl_set_inhomogeneous_tree (le, lb);
|
|
ppl_new_Constraint (&cstr, le, PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (context, cstr);
|
|
ppl_delete_Linear_Expression (le);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
|
|
if (ub)
|
|
{
|
|
ppl_new_Linear_Expression_with_dimension (&le, scop_nb_params (scop));
|
|
ppl_set_coef (le, p, -1);
|
|
ppl_set_inhomogeneous_tree (le, ub);
|
|
ppl_new_Constraint (&cstr, le, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (context, cstr);
|
|
ppl_delete_Linear_Expression (le);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
}
|
|
|
|
/* Build the context of the SCOP. The context usually contains extra
|
|
constraints that are added to the iteration domains that constrain
|
|
some parameters. */
|
|
|
|
static void
|
|
build_scop_context (scop_p scop)
|
|
{
|
|
ppl_Polyhedron_t context;
|
|
graphite_dim_t p, n = scop_nb_params (scop);
|
|
|
|
ppl_new_C_Polyhedron_from_space_dimension (&context, n, 0);
|
|
|
|
for (p = 0; p < n; p++)
|
|
add_param_constraints (scop, context, p);
|
|
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
|
|
(&SCOP_CONTEXT (scop), context);
|
|
|
|
ppl_delete_Polyhedron (context);
|
|
}
|
|
|
|
/* Build the iteration domains: the loops belonging to the current
|
|
SCOP, and that vary for the execution of the current basic block.
|
|
Returns false if there is no loop in SCOP. */
|
|
|
|
static void
|
|
build_scop_iteration_domain (scop_p scop)
|
|
{
|
|
struct loop *loop;
|
|
sese region = SCOP_REGION (scop);
|
|
int i;
|
|
ppl_Polyhedron_t ph;
|
|
poly_bb_p pbb;
|
|
|
|
ppl_new_C_Polyhedron_from_space_dimension (&ph, scop_nb_params (scop), 0);
|
|
|
|
for (i = 0; VEC_iterate (loop_p, SESE_LOOP_NEST (region), i, loop); i++)
|
|
if (!loop_in_sese_p (loop_outer (loop), region))
|
|
build_loop_iteration_domains (scop, loop, ph, 0);
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
if (gbb_loop (PBB_BLACK_BOX (pbb))->aux)
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
|
|
(&PBB_DOMAIN (pbb), (ppl_const_Pointset_Powerset_C_Polyhedron_t)
|
|
gbb_loop (PBB_BLACK_BOX (pbb))->aux);
|
|
else
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
|
|
(&PBB_DOMAIN (pbb), ph);
|
|
|
|
for (i = 0; VEC_iterate (loop_p, SESE_LOOP_NEST (region), i, loop); i++)
|
|
if (loop->aux)
|
|
{
|
|
ppl_delete_Pointset_Powerset_C_Polyhedron
|
|
((ppl_Pointset_Powerset_C_Polyhedron_t) loop->aux);
|
|
loop->aux = NULL;
|
|
}
|
|
|
|
ppl_delete_Polyhedron (ph);
|
|
}
|
|
|
|
/* Add a constrain to the ACCESSES polyhedron for the alias set of
|
|
data reference DR. ACCESSP_NB_DIMS is the dimension of the
|
|
ACCESSES polyhedron, DOM_NB_DIMS is the dimension of the iteration
|
|
domain. */
|
|
|
|
static void
|
|
pdr_add_alias_set (ppl_Polyhedron_t accesses, data_reference_p dr,
|
|
ppl_dimension_type accessp_nb_dims,
|
|
ppl_dimension_type dom_nb_dims)
|
|
{
|
|
ppl_Linear_Expression_t alias;
|
|
ppl_Constraint_t cstr;
|
|
int alias_set_num = 0;
|
|
|
|
if (dr->aux != NULL)
|
|
{
|
|
alias_set_num = *((int *)(dr->aux));
|
|
free (dr->aux);
|
|
dr->aux = NULL;
|
|
}
|
|
|
|
ppl_new_Linear_Expression_with_dimension (&alias, accessp_nb_dims);
|
|
|
|
ppl_set_coef (alias, dom_nb_dims, 1);
|
|
ppl_set_inhomogeneous (alias, -alias_set_num);
|
|
ppl_new_Constraint (&cstr, alias, PPL_CONSTRAINT_TYPE_EQUAL);
|
|
ppl_Polyhedron_add_constraint (accesses, cstr);
|
|
|
|
ppl_delete_Linear_Expression (alias);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
|
|
/* Add to ACCESSES polyhedron equalities defining the access functions
|
|
to the memory. ACCESSP_NB_DIMS is the dimension of the ACCESSES
|
|
polyhedron, DOM_NB_DIMS is the dimension of the iteration domain.
|
|
PBB is the poly_bb_p that contains the data reference DR. */
|
|
|
|
static void
|
|
pdr_add_memory_accesses (ppl_Polyhedron_t accesses, data_reference_p dr,
|
|
ppl_dimension_type accessp_nb_dims,
|
|
ppl_dimension_type dom_nb_dims,
|
|
poly_bb_p pbb)
|
|
{
|
|
int i, nb_subscripts = DR_NUM_DIMENSIONS (dr);
|
|
Value v;
|
|
scop_p scop = PBB_SCOP (pbb);
|
|
sese region = SCOP_REGION (scop);
|
|
|
|
value_init (v);
|
|
|
|
for (i = 0; i < nb_subscripts; i++)
|
|
{
|
|
ppl_Linear_Expression_t fn, access;
|
|
ppl_Constraint_t cstr;
|
|
ppl_dimension_type subscript = dom_nb_dims + 1 + i;
|
|
tree afn = DR_ACCESS_FN (dr, nb_subscripts - 1 - i);
|
|
|
|
ppl_new_Linear_Expression_with_dimension (&fn, dom_nb_dims);
|
|
ppl_new_Linear_Expression_with_dimension (&access, accessp_nb_dims);
|
|
|
|
value_set_si (v, 1);
|
|
scan_tree_for_params (region, afn, fn, v);
|
|
ppl_assign_Linear_Expression_from_Linear_Expression (access, fn);
|
|
|
|
ppl_set_coef (access, subscript, -1);
|
|
ppl_new_Constraint (&cstr, access, PPL_CONSTRAINT_TYPE_EQUAL);
|
|
ppl_Polyhedron_add_constraint (accesses, cstr);
|
|
|
|
ppl_delete_Linear_Expression (fn);
|
|
ppl_delete_Linear_Expression (access);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
|
|
value_clear (v);
|
|
}
|
|
|
|
/* Add constrains representing the size of the accessed data to the
|
|
ACCESSES polyhedron. ACCESSP_NB_DIMS is the dimension of the
|
|
ACCESSES polyhedron, DOM_NB_DIMS is the dimension of the iteration
|
|
domain. */
|
|
|
|
static void
|
|
pdr_add_data_dimensions (ppl_Polyhedron_t accesses, data_reference_p dr,
|
|
ppl_dimension_type accessp_nb_dims,
|
|
ppl_dimension_type dom_nb_dims)
|
|
{
|
|
tree ref = DR_REF (dr);
|
|
int i, nb_subscripts = DR_NUM_DIMENSIONS (dr);
|
|
tree array_size;
|
|
HOST_WIDE_INT elt_size;
|
|
|
|
array_size = TYPE_SIZE (TREE_TYPE (ref));
|
|
if (array_size == NULL_TREE
|
|
|| TREE_CODE (array_size) != INTEGER_CST)
|
|
return;
|
|
|
|
elt_size = int_cst_value (array_size);
|
|
|
|
for (i = nb_subscripts - 1; i >= 0; i--)
|
|
{
|
|
ppl_Linear_Expression_t expr;
|
|
ppl_Constraint_t cstr;
|
|
ppl_dimension_type subscript = dom_nb_dims + 1 + i;
|
|
int size;
|
|
|
|
/* 0 <= subscript */
|
|
ppl_new_Linear_Expression_with_dimension (&expr, accessp_nb_dims);
|
|
ppl_set_coef (expr, subscript, 1);
|
|
ppl_new_Constraint (&cstr, expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (accesses, cstr);
|
|
ppl_delete_Linear_Expression (expr);
|
|
ppl_delete_Constraint (cstr);
|
|
|
|
ref = TREE_OPERAND (ref, 0);
|
|
array_size = TYPE_SIZE (TREE_TYPE (ref));
|
|
if (array_size == NULL_TREE
|
|
|| TREE_CODE (array_size) != INTEGER_CST)
|
|
break;
|
|
|
|
/* subscript <= array_size */
|
|
size = elt_size ? int_cst_value (array_size) / elt_size : 0;
|
|
if (size)
|
|
{
|
|
ppl_new_Linear_Expression_with_dimension (&expr, accessp_nb_dims);
|
|
ppl_set_coef (expr, subscript, -1);
|
|
|
|
ppl_set_inhomogeneous (expr, size);
|
|
|
|
ppl_new_Constraint (&cstr, expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
|
|
ppl_Polyhedron_add_constraint (accesses, cstr);
|
|
ppl_delete_Linear_Expression (expr);
|
|
ppl_delete_Constraint (cstr);
|
|
}
|
|
|
|
elt_size = int_cst_value (array_size);
|
|
}
|
|
}
|
|
|
|
/* Build data accesses for DR in PBB. */
|
|
|
|
static void
|
|
build_poly_dr (data_reference_p dr, poly_bb_p pbb)
|
|
{
|
|
ppl_Polyhedron_t accesses;
|
|
ppl_Pointset_Powerset_C_Polyhedron_t accesses_ps;
|
|
ppl_dimension_type dom_nb_dims;
|
|
ppl_dimension_type accessp_nb_dims;
|
|
|
|
ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb),
|
|
&dom_nb_dims);
|
|
accessp_nb_dims = dom_nb_dims + 1 + DR_NUM_DIMENSIONS (dr);
|
|
|
|
ppl_new_C_Polyhedron_from_space_dimension (&accesses, accessp_nb_dims, 0);
|
|
|
|
pdr_add_alias_set (accesses, dr, accessp_nb_dims, dom_nb_dims);
|
|
pdr_add_memory_accesses (accesses, dr, accessp_nb_dims, dom_nb_dims, pbb);
|
|
pdr_add_data_dimensions (accesses, dr, accessp_nb_dims, dom_nb_dims);
|
|
|
|
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&accesses_ps,
|
|
accesses);
|
|
ppl_delete_Polyhedron (accesses);
|
|
new_poly_dr (pbb, accesses_ps, DR_IS_READ (dr) ? PDR_READ : PDR_WRITE, dr,
|
|
DR_NUM_DIMENSIONS (dr));
|
|
}
|
|
|
|
/* Group each data reference in DRS with it's alias set num. */
|
|
|
|
static void
|
|
build_alias_set_for_drs (VEC (data_reference_p, heap) **drs)
|
|
{
|
|
int num_vertex = VEC_length (data_reference_p, *drs);
|
|
struct graph *g = new_graph (num_vertex);
|
|
data_reference_p dr1, dr2;
|
|
int i, j;
|
|
int num_component;
|
|
int *queue;
|
|
|
|
for (i = 0; VEC_iterate (data_reference_p, *drs, i, dr1); i++)
|
|
for (j = i+1; VEC_iterate (data_reference_p, *drs, j, dr2); j++)
|
|
if (dr_may_alias_p (dr1, dr2))
|
|
{
|
|
add_edge (g, i, j);
|
|
add_edge (g, j, i);
|
|
}
|
|
|
|
queue = XNEWVEC (int, num_vertex);
|
|
for (i = 0; i < num_vertex; i++)
|
|
queue[i] = i;
|
|
|
|
num_component = graphds_dfs (g, queue, num_vertex, NULL, true, NULL);
|
|
|
|
for (i = 0; i < g->n_vertices; i++)
|
|
{
|
|
data_reference_p dr = VEC_index (data_reference_p, *drs, i);
|
|
dr->aux = XNEW (int);
|
|
*((int *)(dr->aux)) = g->vertices[i].component + 1;
|
|
}
|
|
|
|
free (queue);
|
|
free_graph (g);
|
|
}
|
|
|
|
/* Build the data references for PBB. */
|
|
|
|
static void
|
|
build_pbb_drs (poly_bb_p pbb)
|
|
{
|
|
int j;
|
|
data_reference_p dr;
|
|
VEC (data_reference_p, heap) *gbb_drs = GBB_DATA_REFS (PBB_BLACK_BOX (pbb));
|
|
|
|
for (j = 0; VEC_iterate (data_reference_p, gbb_drs, j, dr); j++)
|
|
build_poly_dr (dr, pbb);
|
|
}
|
|
|
|
/* Build data references in SCOP. */
|
|
|
|
static void
|
|
build_scop_drs (scop_p scop)
|
|
{
|
|
int i, j;
|
|
poly_bb_p pbb;
|
|
data_reference_p dr;
|
|
VEC (data_reference_p, heap) *drs = VEC_alloc (data_reference_p, heap, 3);
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
{
|
|
VEC (data_reference_p, heap) *gbb_drs = GBB_DATA_REFS (PBB_BLACK_BOX (pbb));
|
|
for (j = 0; VEC_iterate (data_reference_p, gbb_drs, j, dr); j++)
|
|
VEC_safe_push (data_reference_p, heap, drs, dr);
|
|
}
|
|
|
|
build_alias_set_for_drs (&drs);
|
|
VEC_free (data_reference_p, heap, drs);
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
build_pbb_drs (pbb);
|
|
}
|
|
|
|
/* Return a gsi at the position of the VAR definition. */
|
|
|
|
static gimple_stmt_iterator
|
|
gsi_for_ssa_name_def (tree var)
|
|
{
|
|
gimple stmt;
|
|
basic_block bb;
|
|
gimple_stmt_iterator gsi;
|
|
gimple_stmt_iterator psi;
|
|
|
|
gcc_assert (TREE_CODE (var) == SSA_NAME);
|
|
|
|
stmt = SSA_NAME_DEF_STMT (var);
|
|
bb = gimple_bb (stmt);
|
|
|
|
for (psi = gsi_start_phis (bb); !gsi_end_p (psi); gsi_next (&psi))
|
|
if (stmt == gsi_stmt (psi))
|
|
return gsi_after_labels (bb);
|
|
|
|
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
|
|
if (stmt == gsi_stmt (gsi))
|
|
{
|
|
gsi_next (&gsi);
|
|
return gsi;
|
|
}
|
|
|
|
gcc_unreachable ();
|
|
return gsi;
|
|
}
|
|
|
|
/* Insert the assignment "RES := VAR" just after the definition of VAR. */
|
|
|
|
static void
|
|
insert_out_of_ssa_copy (tree res, tree var)
|
|
{
|
|
gimple_stmt_iterator gsi = gsi_for_ssa_name_def (var);
|
|
gimple stmt;
|
|
gimple_seq stmts;
|
|
gimple_stmt_iterator si;
|
|
|
|
var = force_gimple_operand (var, &stmts, true, NULL_TREE);
|
|
stmt = gimple_build_assign (res, var);
|
|
if (!stmts)
|
|
stmts = gimple_seq_alloc ();
|
|
si = gsi_last (stmts);
|
|
gsi_insert_after (&si, stmt, GSI_NEW_STMT);
|
|
gsi_insert_seq_before (&gsi, stmts, GSI_NEW_STMT);
|
|
}
|
|
|
|
/* Insert on edge E the assignment "RES := EXPR". */
|
|
|
|
static void
|
|
insert_out_of_ssa_copy_on_edge (edge e, tree res, tree expr)
|
|
{
|
|
gimple_stmt_iterator gsi;
|
|
gimple_seq stmts;
|
|
tree var = force_gimple_operand (expr, &stmts, true, NULL_TREE);
|
|
gimple stmt = gimple_build_assign (res, var);
|
|
|
|
if (!stmts)
|
|
stmts = gimple_seq_alloc ();
|
|
|
|
gsi = gsi_last (stmts);
|
|
gsi_insert_after (&gsi, stmt, GSI_NEW_STMT);
|
|
gsi_insert_seq_on_edge (e, stmts);
|
|
gsi_commit_edge_inserts ();
|
|
}
|
|
|
|
/* Creates a zero dimension array of the same type as VAR. */
|
|
|
|
static tree
|
|
create_zero_dim_array (tree var)
|
|
{
|
|
tree index_type = build_index_type (integer_zero_node);
|
|
tree elt_type = TREE_TYPE (var);
|
|
tree array_type = build_array_type (elt_type, index_type);
|
|
tree base = create_tmp_var (array_type, "Red");
|
|
|
|
add_referenced_var (base);
|
|
|
|
return build4 (ARRAY_REF, elt_type, base, integer_zero_node, NULL_TREE,
|
|
NULL_TREE);
|
|
}
|
|
|
|
/* Returns true when PHI is a loop close phi node. */
|
|
|
|
static bool
|
|
scalar_close_phi_node_p (gimple phi)
|
|
{
|
|
gcc_assert (gimple_code (phi) == GIMPLE_PHI);
|
|
|
|
if (!is_gimple_reg (gimple_phi_result (phi)))
|
|
return false;
|
|
|
|
return (gimple_phi_num_args (phi) == 1);
|
|
}
|
|
|
|
/* Rewrite out of SSA the reduction phi node at PSI by creating a zero
|
|
dimension array for it. */
|
|
|
|
static void
|
|
rewrite_close_phi_out_of_ssa (gimple_stmt_iterator *psi)
|
|
{
|
|
gimple phi = gsi_stmt (*psi);
|
|
tree res = gimple_phi_result (phi);
|
|
tree var = SSA_NAME_VAR (res);
|
|
tree zero_dim_array = create_zero_dim_array (var);
|
|
gimple_stmt_iterator gsi = gsi_after_labels (gimple_bb (phi));
|
|
gimple stmt = gimple_build_assign (res, zero_dim_array);
|
|
tree arg = gimple_phi_arg_def (phi, 0);
|
|
|
|
insert_out_of_ssa_copy (zero_dim_array, arg);
|
|
|
|
remove_phi_node (psi, false);
|
|
gsi_insert_before (&gsi, stmt, GSI_NEW_STMT);
|
|
SSA_NAME_DEF_STMT (res) = stmt;
|
|
}
|
|
|
|
/* Rewrite out of SSA the reduction phi node at PSI by creating a zero
|
|
dimension array for it. */
|
|
|
|
static void
|
|
rewrite_phi_out_of_ssa (gimple_stmt_iterator *psi)
|
|
{
|
|
size_t i;
|
|
gimple phi = gsi_stmt (*psi);
|
|
basic_block bb = gimple_bb (phi);
|
|
tree res = gimple_phi_result (phi);
|
|
tree var = SSA_NAME_VAR (res);
|
|
tree zero_dim_array = create_zero_dim_array (var);
|
|
gimple_stmt_iterator gsi;
|
|
gimple stmt;
|
|
gimple_seq stmts;
|
|
|
|
for (i = 0; i < gimple_phi_num_args (phi); i++)
|
|
{
|
|
tree arg = gimple_phi_arg_def (phi, i);
|
|
|
|
/* Try to avoid the insertion on edges as much as possible: this
|
|
would avoid the insertion of code on loop latch edges, making
|
|
the pattern matching of the vectorizer happy, or it would
|
|
avoid the insertion of useless basic blocks. Note that it is
|
|
incorrect to insert out of SSA copies close by their
|
|
definition when they are more than two loop levels apart:
|
|
for example, starting from a double nested loop
|
|
|
|
| a = ...
|
|
| loop_1
|
|
| loop_2
|
|
| b = phi (a, c)
|
|
| c = ...
|
|
| end_2
|
|
| end_1
|
|
|
|
the following transform is incorrect
|
|
|
|
| a = ...
|
|
| Red[0] = a
|
|
| loop_1
|
|
| loop_2
|
|
| b = Red[0]
|
|
| c = ...
|
|
| Red[0] = c
|
|
| end_2
|
|
| end_1
|
|
|
|
whereas inserting the copy on the incomming edge is correct
|
|
|
|
| a = ...
|
|
| loop_1
|
|
| Red[0] = a
|
|
| loop_2
|
|
| b = Red[0]
|
|
| c = ...
|
|
| Red[0] = c
|
|
| end_2
|
|
| end_1
|
|
*/
|
|
if (TREE_CODE (arg) == SSA_NAME
|
|
&& is_gimple_reg (arg)
|
|
&& gimple_bb (SSA_NAME_DEF_STMT (arg))
|
|
&& (flow_bb_inside_loop_p (bb->loop_father,
|
|
gimple_bb (SSA_NAME_DEF_STMT (arg)))
|
|
|| flow_bb_inside_loop_p (loop_outer (bb->loop_father),
|
|
gimple_bb (SSA_NAME_DEF_STMT (arg)))))
|
|
insert_out_of_ssa_copy (zero_dim_array, arg);
|
|
else
|
|
insert_out_of_ssa_copy_on_edge (gimple_phi_arg_edge (phi, i),
|
|
zero_dim_array, arg);
|
|
}
|
|
|
|
var = force_gimple_operand (zero_dim_array, &stmts, true, NULL_TREE);
|
|
|
|
if (!stmts)
|
|
stmts = gimple_seq_alloc ();
|
|
|
|
stmt = gimple_build_assign (res, var);
|
|
remove_phi_node (psi, false);
|
|
SSA_NAME_DEF_STMT (res) = stmt;
|
|
|
|
gsi = gsi_last (stmts);
|
|
gsi_insert_after (&gsi, stmt, GSI_NEW_STMT);
|
|
|
|
gsi = gsi_after_labels (bb);
|
|
gsi_insert_seq_before (&gsi, stmts, GSI_NEW_STMT);
|
|
}
|
|
|
|
/* Rewrite out of SSA all the reduction phi nodes of SCOP. */
|
|
|
|
static void
|
|
rewrite_reductions_out_of_ssa (scop_p scop)
|
|
{
|
|
basic_block bb;
|
|
gimple_stmt_iterator psi;
|
|
sese region = SCOP_REGION (scop);
|
|
|
|
FOR_EACH_BB (bb)
|
|
if (bb_in_region (bb, SESE_ENTRY_BB (region), SESE_EXIT_BB (region)))
|
|
for (psi = gsi_start_phis (bb); !gsi_end_p (psi);)
|
|
{
|
|
if (scalar_close_phi_node_p (gsi_stmt (psi)))
|
|
rewrite_close_phi_out_of_ssa (&psi);
|
|
else if (reduction_phi_p (region, &psi))
|
|
rewrite_phi_out_of_ssa (&psi);
|
|
}
|
|
|
|
update_ssa (TODO_update_ssa);
|
|
#ifdef ENABLE_CHECKING
|
|
verify_ssa (false);
|
|
verify_loop_closed_ssa ();
|
|
#endif
|
|
}
|
|
|
|
/* Returns the number of pbbs that are in loops contained in SCOP. */
|
|
|
|
static int
|
|
nb_pbbs_in_loops (scop_p scop)
|
|
{
|
|
int i;
|
|
poly_bb_p pbb;
|
|
int res = 0;
|
|
|
|
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
|
|
if (loop_in_sese_p (gbb_loop (PBB_BLACK_BOX (pbb)), SCOP_REGION (scop)))
|
|
res++;
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Builds the polyhedral representation for a SESE region. */
|
|
|
|
bool
|
|
build_poly_scop (scop_p scop)
|
|
{
|
|
sese region = SCOP_REGION (scop);
|
|
rewrite_reductions_out_of_ssa (scop);
|
|
build_scop_bbs (scop);
|
|
|
|
/* FIXME: This restriction is needed to avoid a problem in CLooG.
|
|
Once CLooG is fixed, remove this guard. Anyways, it makes no
|
|
sense to optimize a scop containing only PBBs that do not belong
|
|
to any loops. */
|
|
if (nb_pbbs_in_loops (scop) == 0)
|
|
return false;
|
|
|
|
build_sese_loop_nests (region);
|
|
build_sese_conditions (region);
|
|
find_scop_parameters (scop);
|
|
|
|
build_scop_iteration_domain (scop);
|
|
build_scop_context (scop);
|
|
|
|
add_conditions_to_constraints (scop);
|
|
build_scop_scattering (scop);
|
|
build_scop_drs (scop);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Always return false. Exercise the scop_to_clast function. */
|
|
|
|
void
|
|
check_poly_representation (scop_p scop)
|
|
{
|
|
#ifdef ENABLE_CHECKING
|
|
cloog_prog_clast pc = scop_to_clast (scop);
|
|
cloog_clast_free (pc.stmt);
|
|
cloog_program_free (pc.prog);
|
|
#endif
|
|
}
|
|
#endif
|