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re PR tree-optimization/56962 (SLSR caused miscompilation of fftw) 

PR tree-optimization/56962
	* gimple-ssa-strength-reduction.c (record_increment): Only set
	initializer if gimple_assign_rhs_code is {,POINTER_}PLUS_EXPR and
	either rhs1 or rhs2 is equal to c->base_expr.

	* gcc.c-torture/execute/pr56962.c: New test.

From-SVN: r197978
This commit is contained in:
Jakub Jelinek 2013-04-15 16:56:36 +02:00 committed by Jakub Jelinek
parent 5185d248d5
commit 7b8265ba38
4 changed files with 50 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2013-04-15 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/56962
* gimple-ssa-strength-reduction.c (record_increment): Only set
initializer if gimple_assign_rhs_code is {,POINTER_}PLUS_EXPR and
either rhs1 or rhs2 is equal to c->base_expr.
2013-04-15 Richard Biener <rguenther@suse.de>
PR tree-optimization/56933

12
gcc/gimple-ssa-strength-reduction.c
View File

@ -1829,16 +1829,20 @@ record_increment (slsr_cand_t c, double_int increment)
if (c->kind == CAND_ADD
&& c->index == increment
&& (increment.sgt (double_int_one)
|| increment.slt (double_int_minus_one)))
|| increment.slt (double_int_minus_one))
&& (gimple_assign_rhs_code (c->cand_stmt) == PLUS_EXPR
|| gimple_assign_rhs_code (c->cand_stmt) == POINTER_PLUS_EXPR))
{
tree t0;
tree t0 = NULL_TREE;
tree rhs1 = gimple_assign_rhs1 (c->cand_stmt);
tree rhs2 = gimple_assign_rhs2 (c->cand_stmt);
if (operand_equal_p (rhs1, c->base_expr, 0))
t0 = rhs2;
else
else if (operand_equal_p (rhs2, c->base_expr, 0))
t0 = rhs1;
if (SSA_NAME_DEF_STMT (t0) && gimple_bb (SSA_NAME_DEF_STMT (t0)))
if (t0
&& SSA_NAME_DEF_STMT (t0)
&& gimple_bb (SSA_NAME_DEF_STMT (t0)))
{
incr_vec[incr_vec_len].initializer = t0;
incr_vec[incr_vec_len++].init_bb

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-04-15 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/56962
* gcc.c-torture/execute/pr56962.c: New test.
2013-04-15 Richard Biener <rguenther@suse.de>
PR tree-optimization/56933

30
gcc/testsuite/gcc.c-torture/execute/pr56962.c Normal file
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@ -0,0 +1,30 @@
/* PR tree-optimization/56962 */
extern void abort (void);
long long v[144];
__attribute__((noinline, noclone)) void
bar (long long *x)
{
if (x != &v[29])
abort ();
}
__attribute__((noinline, noclone)) void
foo (long long *x, long y, long z)
{
long long a, b, c;
a = x[z * 4 + y * 3];
b = x[z * 5 + y * 3];
c = x[z * 5 + y * 4];
x[y * 4] = a;
bar (&x[z * 5 + y]);
x[z * 5 + y * 5] = b + c;
}
int
main ()
{
foo (v, 24, 1);
return 0;
}