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re PR tree-optimization/53550 (ICE with -O{1,2,3} -fprefetch-loop-arrays in build2_stat, at tree.c:3803) 

PR tree-optimization/53550
	* tree-ssa-loop-niter.c (number_of_iterations_cond): If type
	is POINTER_TYPE_P, use sizetype as step type instead of type.

	* gcc.dg/pr53550.c: New test.

From-SVN: r188169
This commit is contained in:
Jakub Jelinek 2012-06-04 11:23:27 +02:00 committed by Jakub Jelinek
parent c014f6f54b
commit 5ece98479f
4 changed files with 26 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-06-04 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/53550
* tree-ssa-loop-niter.c (number_of_iterations_cond): If type
is POINTER_TYPE_P, use sizetype as step type instead of type.
2012-06-04 Richard Guenther <rguenther@suse.de>
* tree-data-ref.c (have_similar_memory_accesses_1): Remove.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-06-04 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/53550
* gcc.dg/pr53550.c: New test.
2012-06-04 Richard Guenther <rguenther@suse.de>
* gcc.dg/tree-ssa/ldist-11.c: Enable -ftree-loop-distribute-patterns.

12
gcc/testsuite/gcc.dg/pr53550.c Normal file
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@ -0,0 +1,12 @@
/* PR tree-optimization/53550 */
/* { dg-do compile } */
/* { dg-options "-O2 -fprefetch-loop-arrays -w" } */
int *
foo (int *x)
{
int *a = x + 10, *b = x, *c = a;
while (b != c)
*--c = *b++;
return x;
}

5
gcc/tree-ssa-loop-niter.c
View File

@ -1275,13 +1275,14 @@ number_of_iterations_cond (struct loop *loop,
practice, but it is simple enough to manage. */
if (!integer_zerop (iv0->step) && !integer_zerop (iv1->step))
{
tree step_type = POINTER_TYPE_P (type) ? sizetype : type;
if (code != NE_EXPR)
return false;
iv0->step = fold_binary_to_constant (MINUS_EXPR, type,
iv0->step = fold_binary_to_constant (MINUS_EXPR, step_type,
iv0->step, iv1->step);
iv0->no_overflow = false;
iv1->step = build_int_cst (type, 0);
iv1->step = build_int_cst (step_type, 0);
iv1->no_overflow = true;
}