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[PATCH][2/n] Alias housekeeping
- From: Richard Guenther <rguenther at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Wed, 27 Apr 2011 11:08:19 +0200 (CEST)
- Subject: [PATCH][2/n] Alias housekeeping
This fixes TARGET_MEM_REF handling in indirect_refs_may_alias_p,
unifying handling of it and MEM_REFs where possible.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.
Richard.
2011-04-27 Richard Guenther <rguenther@suse.de>
* tree-ssa-alias.c (indirect_refs_may_alias_p): Fix
TARGET_MEM_REF handling.
Index: gcc/tree-ssa-alias.c
===================================================================
--- gcc/tree-ssa-alias.c (revision 172965)
+++ gcc/tree-ssa-alias.c (working copy)
@@ -925,12 +935,12 @@ indirect_refs_may_alias_p (tree ref1 ATT
/* If both references are through the same type, they do not alias
if the accesses do not overlap. This does extra disambiguation
for mixed/pointer accesses but requires strict aliasing. */
- if ((TREE_CODE (base1) != TARGET_MEM_REF || !TMR_INDEX (base1))
- && (TREE_CODE (base2) != TARGET_MEM_REF || !TMR_INDEX (base2))
- && (TREE_CODE (base1) != MEM_REF
- || same_type_for_tbaa (TREE_TYPE (base1), TREE_TYPE (ptrtype1)) == 1)
- && (TREE_CODE (base2) != MEM_REF
- || same_type_for_tbaa (TREE_TYPE (base2), TREE_TYPE (ptrtype2)) == 1)
+ if ((TREE_CODE (base1) != TARGET_MEM_REF
+ || (!TMR_INDEX (base1) && !TMR_INDEX2 (base1)))
+ && (TREE_CODE (base2) != TARGET_MEM_REF
+ || (!TMR_INDEX (base2) && !TMR_INDEX2 (base2)))
+ && same_type_for_tbaa (TREE_TYPE (base1), TREE_TYPE (ptrtype1)) == 1
+ && same_type_for_tbaa (TREE_TYPE (base2), TREE_TYPE (ptrtype2)) == 1
&& same_type_for_tbaa (TREE_TYPE (ptrtype1),
TREE_TYPE (ptrtype2)) == 1)
return ranges_overlap_p (offset1, max_size1, offset2, max_size2);
@@ -942,14 +952,9 @@ indirect_refs_may_alias_p (tree ref1 ATT
/* Do access-path based disambiguation. */
if (ref1 && ref2
- && handled_component_p (ref1)
- && handled_component_p (ref2)
- && TREE_CODE (base1) != TARGET_MEM_REF
- && TREE_CODE (base2) != TARGET_MEM_REF
- && (TREE_CODE (base1) != MEM_REF
- || same_type_for_tbaa (TREE_TYPE (base1), TREE_TYPE (ptrtype1)) == 1)
- && (TREE_CODE (base2) != MEM_REF
- || same_type_for_tbaa (TREE_TYPE (base2), TREE_TYPE (ptrtype2)) == 1))
+ && (handled_component_p (ref1) || handled_component_p (ref2))
+ && same_type_for_tbaa (TREE_TYPE (base1), TREE_TYPE (ptrtype1)) == 1
+ && same_type_for_tbaa (TREE_TYPE (base2), TREE_TYPE (ptrtype2)) == 1)
return aliasing_component_refs_p (ref1,
ref1_alias_set, base1_alias_set,
offset1, max_size1,