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tree-optimization/105786 - avoid strlen replacement for pointers 

This avoids matching strlen to a pointer result, avoiding ICEing
because of an integer adjustment using PLUS_EXPR on pointers.

2022-06-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105786
	* tree-loop-distribution.cc
	(loop_distribution::transform_reduction_loop): Only do strlen
	replacement for integer type reductions.

	* gcc.dg/torture/pr105786.c: New testcase.

(cherry picked from commit 57a8fb92ac)
This commit is contained in:
Richard Biener 2022-06-01 14:13:01 +02:00
parent 9bc27ee76d
commit 9f1e32c69d
2 changed files with 14 additions and 0 deletions
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13
gcc/testsuite/gcc.dg/torture/pr105786.c Normal file
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@ -0,0 +1,13 @@
/* { dg-do compile } */
void sink(const char*);
static const char *a;
int main()
{
const char *b = a;
for (int i = 0; i < 2; ++i)
while (*b++)
;
sink(b);
return 0;
}

1
gcc/tree-loop-distribution.cc
View File

@ -3658,6 +3658,7 @@ loop_distribution::transform_reduction_loop (loop_p loop)
/* Handle strlen like loops. */
if (store_dr == NULL
&& integer_zerop (pattern)
&& INTEGRAL_TYPE_P (TREE_TYPE (reduction_var))
&& TREE_CODE (reduction_iv.base) == INTEGER_CST
&& TREE_CODE (reduction_iv.step) == INTEGER_CST
&& integer_onep (reduction_iv.step))