diff options
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index a9ae29f..eb57010 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2390,9 +2390,7 @@ have_common_aliases_p (bitmap tag1aliases, bitmap tag2aliases) /* This is the old behavior of have_common_aliases_p, which is to return false if both sets are empty, or one set is and the other isn't. */ - if ((tag1aliases == NULL && tag2aliases != NULL) - || (tag2aliases == NULL && tag1aliases != NULL) - || (tag1aliases == NULL && tag2aliases == NULL)) + if (tag1aliases == NULL || tag2aliases == NULL) return false; return bitmap_intersect_p (tag1aliases, tag2aliases); @@ -2490,12 +2488,16 @@ compute_flow_insensitive_aliasing (struct alias_info *ai) if (PTR_IS_REF_ALL (p_map1->var)) continue; - for (j = i + 1; j < ai->num_pointers; j++) + for (j = 0; j < ai->num_pointers; j++) { struct alias_map_d *p_map2 = ai->pointers[j]; tree tag2 = symbol_mem_tag (p_map2->var); bitmap may_aliases2 = may_aliases (tag2); + /* By convention tags don't alias themselves. */ + if (tag1 == tag2) + continue; + if (PTR_IS_REF_ALL (p_map2->var)) continue; @@ -2508,18 +2510,8 @@ compute_flow_insensitive_aliasing (struct alias_info *ai) if (have_common_aliases_p (may_aliases1, may_aliases2)) continue; - if (may_aliases2 && !bitmap_empty_p (may_aliases2)) - { - union_alias_set_into (tag1, may_aliases2); - } - else - { - /* Since TAG2 does not have any aliases of its own, add - TAG2 itself to the alias set of TAG1. */ - add_may_alias (tag1, tag2); - } + add_may_alias (tag1, tag2); } - } timevar_pop (TV_FLOW_INSENSITIVE); } |