237 lines
6.6 KiB
C
237 lines
6.6 KiB
C
/* This file contains routines to construct and validate Cilk Plus
|
|
constructs within the C and C++ front ends.
|
|
|
|
Copyright (C) 2013-2015 Free Software Foundation, Inc.
|
|
Contributed by Aldy Hernandez <aldyh@redhat.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 "hash-set.h"
|
|
#include "machmode.h"
|
|
#include "vec.h"
|
|
#include "double-int.h"
|
|
#include "input.h"
|
|
#include "alias.h"
|
|
#include "symtab.h"
|
|
#include "options.h"
|
|
#include "wide-int.h"
|
|
#include "inchash.h"
|
|
#include "tree.h"
|
|
#include "c-common.h"
|
|
|
|
/* Validate the body of a _Cilk_for construct or a <#pragma simd> for
|
|
loop.
|
|
|
|
Returns true if there were no errors, false otherwise. */
|
|
|
|
bool
|
|
c_check_cilk_loop (location_t loc, tree decl)
|
|
{
|
|
if (TREE_THIS_VOLATILE (decl))
|
|
{
|
|
error_at (loc, "iteration variable cannot be volatile");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Validate and emit code for <#pragma simd> clauses. */
|
|
|
|
tree
|
|
c_finish_cilk_clauses (tree clauses)
|
|
{
|
|
for (tree c = clauses; c; c = OMP_CLAUSE_CHAIN (c))
|
|
{
|
|
tree prev = clauses;
|
|
|
|
/* If a variable appears in a linear clause it cannot appear in
|
|
any other OMP clause. */
|
|
if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_LINEAR)
|
|
for (tree c2 = clauses; c2; c2 = OMP_CLAUSE_CHAIN (c2))
|
|
{
|
|
if (c == c2)
|
|
continue;
|
|
enum omp_clause_code code = OMP_CLAUSE_CODE (c2);
|
|
|
|
switch (code)
|
|
{
|
|
case OMP_CLAUSE_LINEAR:
|
|
case OMP_CLAUSE_PRIVATE:
|
|
case OMP_CLAUSE_FIRSTPRIVATE:
|
|
case OMP_CLAUSE_LASTPRIVATE:
|
|
case OMP_CLAUSE_REDUCTION:
|
|
break;
|
|
|
|
case OMP_CLAUSE_SAFELEN:
|
|
goto next;
|
|
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
|
|
if (OMP_CLAUSE_DECL (c) == OMP_CLAUSE_DECL (c2))
|
|
{
|
|
error_at (OMP_CLAUSE_LOCATION (c2),
|
|
"variable appears in more than one clause");
|
|
inform (OMP_CLAUSE_LOCATION (c),
|
|
"other clause defined here");
|
|
// Remove problematic clauses.
|
|
OMP_CLAUSE_CHAIN (prev) = OMP_CLAUSE_CHAIN (c2);
|
|
}
|
|
next:
|
|
prev = c2;
|
|
}
|
|
}
|
|
return clauses;
|
|
}
|
|
|
|
/* Calculate number of iterations of CILK_FOR. */
|
|
|
|
tree
|
|
cilk_for_number_of_iterations (tree cilk_for)
|
|
{
|
|
tree t, v, n1, n2, step, type, init, cond, incr, itype;
|
|
enum tree_code cond_code;
|
|
location_t loc = EXPR_LOCATION (cilk_for);
|
|
|
|
init = TREE_VEC_ELT (OMP_FOR_INIT (cilk_for), 0);
|
|
v = TREE_OPERAND (init, 0);
|
|
cond = TREE_VEC_ELT (OMP_FOR_COND (cilk_for), 0);
|
|
incr = TREE_VEC_ELT (OMP_FOR_INCR (cilk_for), 0);
|
|
type = TREE_TYPE (v);
|
|
|
|
gcc_assert (TREE_CODE (TREE_TYPE (v)) == INTEGER_TYPE
|
|
|| TREE_CODE (TREE_TYPE (v)) == POINTER_TYPE);
|
|
n1 = TREE_OPERAND (init, 1);
|
|
cond_code = TREE_CODE (cond);
|
|
n2 = TREE_OPERAND (cond, 1);
|
|
switch (cond_code)
|
|
{
|
|
case LT_EXPR:
|
|
case GT_EXPR:
|
|
case NE_EXPR:
|
|
break;
|
|
case LE_EXPR:
|
|
if (POINTER_TYPE_P (TREE_TYPE (n2)))
|
|
n2 = fold_build_pointer_plus_hwi_loc (loc, n2, 1);
|
|
else
|
|
n2 = fold_build2_loc (loc, PLUS_EXPR, TREE_TYPE (n2), n2,
|
|
build_int_cst (TREE_TYPE (n2), 1));
|
|
cond_code = LT_EXPR;
|
|
break;
|
|
case GE_EXPR:
|
|
if (POINTER_TYPE_P (TREE_TYPE (n2)))
|
|
n2 = fold_build_pointer_plus_hwi_loc (loc, n2, -1);
|
|
else
|
|
n2 = fold_build2_loc (loc, MINUS_EXPR, TREE_TYPE (n2), n2,
|
|
build_int_cst (TREE_TYPE (n2), 1));
|
|
cond_code = GT_EXPR;
|
|
break;
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
|
|
step = NULL_TREE;
|
|
switch (TREE_CODE (incr))
|
|
{
|
|
case PREINCREMENT_EXPR:
|
|
case POSTINCREMENT_EXPR:
|
|
step = build_int_cst (TREE_TYPE (v), 1);
|
|
break;
|
|
case PREDECREMENT_EXPR:
|
|
case POSTDECREMENT_EXPR:
|
|
step = build_int_cst (TREE_TYPE (v), -1);
|
|
break;
|
|
case MODIFY_EXPR:
|
|
t = TREE_OPERAND (incr, 1);
|
|
gcc_assert (TREE_OPERAND (t, 0) == v);
|
|
switch (TREE_CODE (t))
|
|
{
|
|
case PLUS_EXPR:
|
|
step = TREE_OPERAND (t, 1);
|
|
break;
|
|
case POINTER_PLUS_EXPR:
|
|
step = fold_convert (ssizetype, TREE_OPERAND (t, 1));
|
|
break;
|
|
case MINUS_EXPR:
|
|
step = TREE_OPERAND (t, 1);
|
|
step = fold_build1_loc (loc, NEGATE_EXPR, TREE_TYPE (step), step);
|
|
break;
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
break;
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
|
|
itype = type;
|
|
if (POINTER_TYPE_P (itype))
|
|
itype = signed_type_for (itype);
|
|
if (cond_code == NE_EXPR)
|
|
{
|
|
/* For NE_EXPR, we need to find out if the iterator increases
|
|
or decreases from whether step is positive or negative. */
|
|
tree stype = itype;
|
|
if (TYPE_UNSIGNED (stype))
|
|
stype = signed_type_for (stype);
|
|
cond = fold_build2_loc (loc, GE_EXPR, boolean_type_node,
|
|
fold_convert_loc (loc, stype, step),
|
|
build_int_cst (stype, 0));
|
|
t = fold_build3_loc (loc, COND_EXPR, itype, cond,
|
|
build_int_cst (itype, -1),
|
|
build_int_cst (itype, 1));
|
|
}
|
|
else
|
|
t = build_int_cst (itype, (cond_code == LT_EXPR ? -1 : 1));
|
|
t = fold_build2_loc (loc, PLUS_EXPR, itype,
|
|
fold_convert_loc (loc, itype, step), t);
|
|
t = fold_build2_loc (loc, PLUS_EXPR, itype, t,
|
|
fold_convert_loc (loc, itype, n2));
|
|
t = fold_build2_loc (loc, MINUS_EXPR, itype, t,
|
|
fold_convert_loc (loc, itype, n1));
|
|
if (TYPE_UNSIGNED (itype) && 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,
|
|
step)));
|
|
else if (TYPE_UNSIGNED (itype) && cond_code == NE_EXPR)
|
|
{
|
|
tree t1
|
|
= fold_build2_loc (loc, TRUNC_DIV_EXPR, itype, t,
|
|
fold_convert_loc (loc, itype, step));
|
|
tree t2
|
|
= 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,
|
|
step)));
|
|
t = fold_build3_loc (loc, COND_EXPR, itype, cond, t1, t2);
|
|
}
|
|
else
|
|
t = fold_build2_loc (loc, TRUNC_DIV_EXPR, itype, t,
|
|
fold_convert_loc (loc, itype, step));
|
|
cond = fold_build2_loc (loc, cond_code, boolean_type_node, n1, n2);
|
|
t = fold_build3_loc (loc, COND_EXPR, itype, cond, t,
|
|
build_int_cst (itype, 0));
|
|
return t;
|
|
}
|