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re PR tree-optimization/58958 (Wrong aliasing info for variable index) 

2013-11-05  Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/58958
gcc/
	* tree-ssa-alias.c (ao_ref_init_from_ptr_and_size): Use
	get_addr_base_and_unit_offset instead of get_ref_base_and_extent.

gcc/testsuite/
	* gcc.dg/tree-ssa/pr58958.c: New file.

From-SVN: r204389
This commit is contained in:
Marc Glisse 2013-11-05 14:01:06 +01:00 committed by Marc Glisse
parent 75081240d0
commit 4de9c53f02
4 changed files with 35 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/58958
* tree-ssa-alias.c (ao_ref_init_from_ptr_and_size): Use
get_addr_base_and_unit_offset instead of get_ref_base_and_extent.
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
* tree-ssa-alias.h (ranges_overlap_p): Handle negative offsets.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/58958
* gcc.dg/tree-ssa/pr58958.c: New file.
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/alias-26.c: New file.

12
gcc/testsuite/gcc.dg/tree-ssa/pr58958.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
double a[10];
int f(int n){
a[3]=9;
__builtin_memset(&a[n],3,sizeof(double));
return a[3]==9;
}
/* { dg-final { scan-tree-dump " == 9" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

15
gcc/tree-ssa-alias.c
View File

@ -566,7 +566,7 @@ ao_ref_alias_set (ao_ref *ref)
void
ao_ref_init_from_ptr_and_size (ao_ref *ref, tree ptr, tree size)
{
HOST_WIDE_INT t1, t2, extra_offset = 0;
HOST_WIDE_INT t, extra_offset = 0;
ref->ref = NULL_TREE;
if (TREE_CODE (ptr) == SSA_NAME)
{
@ -585,8 +585,17 @@ ao_ref_init_from_ptr_and_size (ao_ref *ref, tree ptr, tree size)
}
if (TREE_CODE (ptr) == ADDR_EXPR)
ref->base = get_ref_base_and_extent (TREE_OPERAND (ptr, 0),
&ref->offset, &t1, &t2);
{
ref->base = get_addr_base_and_unit_offset (TREE_OPERAND (ptr, 0), &t);
if (ref->base)
ref->offset = BITS_PER_UNIT * t;
else
{
size = NULL_TREE;
ref->offset = 0;
ref->base = get_base_address (TREE_OPERAND (ptr, 0));
}
}
else
{
ref->base = build2 (MEM_REF, char_type_node,