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re PR tree-optimization/17528 (tree optimization incorrectly optimizes away entire function (incorrect aliasing detection?))

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PR tree-optimization/17528
	* tree-ssa-alias.c (compute_flow_insensitive_aliasing): Do not
	erase the may-alias set for a tag when merging it with
	another.

From-SVN: r87624
This commit is contained in:
Diego Novillo 2004-09-17 01:10:28 +00:00 • committed by Diego Novillo
parent 02382b9149
commit 7a1162112b
2 changed files with 7 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-09-16 Diego Novillo <dnovillo@redhat.com>
PR tree-optimization/17528
* tree-ssa-alias.c (compute_flow_insensitive_aliasing): Do not
erase the may-alias set for a tag when merging it with
another.
2004-09-16 Kaz Kojima <kkojima@gcc.gnu.org>
* config/sh/sh.md (call): Extend 32-bit addresses to DImode

3
gcc/tree-ssa-alias.c
View file

@ -977,7 +977,6 @@ compute_flow_insensitive_aliasing (struct alias_info *ai)
{
struct alias_map_d *p_map2 = ai->pointers[j];
tree tag2 = var_ann (p_map2->var)->type_mem_tag;
var_ann_t tag2_ann = var_ann (tag2);
sbitmap may_aliases2 = p_map2->may_aliases;
/* If the pointers may not point to each other, do nothing. */
@ -999,8 +998,6 @@ compute_flow_insensitive_aliasing (struct alias_info *ai)
EXECUTE_IF_SET_IN_SBITMAP (may_aliases2, 0, k,
add_may_alias (tag1, referenced_var (k)));
sbitmap_a_or_b (may_aliases1, may_aliases1, may_aliases2);
sbitmap_zero (may_aliases2);
tag2_ann->may_aliases = NULL;
}
else
{