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re PR tree-optimization/36038 (miscompiled loop in perlbmk for -Os)

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PR tree-optimization/36038
	* tree-ssa-loop-ivopts.c (add_old_iv_candidates): For pointer bases
	add sizetype IV with initial value zero instead of pointer type.

	* gcc.c-torture/compile/pr36038.c: New test.

From-SVN: r141343
This commit is contained in:
Jakub Jelinek 2008-10-24 15:57:43 +02:00 committed by Jakub Jelinek
parent 918bf5c10e
commit 1a00e5f7fb
4 changed files with 59 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2008-10-24 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/36038
* tree-ssa-loop-ivopts.c (add_old_iv_candidates): For pointer bases
add sizetype IV with initial value zero instead of pointer type.
2008-10-24 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR c/7543

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2008-10-24 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/36038
* gcc.c-torture/compile/pr36038.c: New test.
2008-10-24 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR c/7543

43
gcc/testsuite/gcc.c-torture/compile/pr36038.c Normal file
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@ -0,0 +1,43 @@
/* PR tree-optimization/36038 */
long long list[10];
long long expect[10] = { 0, 1, 2, 3, 4, 4, 5, 6, 7, 9 };
long long *stack_base;
int indices[10];
int *markstack_ptr;
void
doit (void)
{
long long *src;
long long *dst;
long long *sp = stack_base + 5;
int diff = 2;
int shift;
int count;
shift = diff - (markstack_ptr[-1] - markstack_ptr[-2]);
count = (sp - stack_base) - markstack_ptr[-1] + 2;
src = sp;
dst = (sp += shift);
while (--count)
*dst-- = *src--;
}
int
main ()
{
int i;
for (i = 0; i < 10; i++)
list[i] = i;
markstack_ptr = indices + 9;
markstack_ptr[-1] = 2;
markstack_ptr[-2] = 1;
stack_base = list + 2;
doit ();
if (__builtin_memcmp (expect, list, sizeof (list)))
__builtin_abort ();
return 0;
}

8
gcc/tree-ssa-loop-ivopts.c
View File

@ -2228,9 +2228,11 @@ add_old_iv_candidates (struct ivopts_data *data, struct iv *iv)
add_candidate (data, iv->base, iv->step, true, NULL);
/* The same, but with initial value zero. */
add_candidate (data,
build_int_cst (TREE_TYPE (iv->base), 0),
iv->step, true, NULL);
if (POINTER_TYPE_P (TREE_TYPE (iv->base)))
add_candidate (data, size_int (0), iv->step, true, NULL);
else
add_candidate (data, build_int_cst (TREE_TYPE (iv->base), 0),
iv->step, true, NULL);
phi = SSA_NAME_DEF_STMT (iv->ssa_name);
if (gimple_code (phi) == GIMPLE_PHI)