[Bug tree-optimization/31090] Revision 121302 causes 30% performance regression

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #2 from rguenth at gcc dot gnu dot org  2007-03-09 10:32 -------
It looks like a no-op change.  For reference:

--- ChangeLog   (revision 121301)
+++ ChangeLog   (revision 121302)
@@ -1,3 +1,41 @@
+2007-01-28  Daniel Berlin  <dberlin@dberlin.org>
+
+       * tree.h (struct tree_memory_tag): Add aliases member.
+       (MTAG_ALIASES): New macro.
+       * tree-ssa-alias.c (alias_bitmap_obstack): New variable.
+       (add_may_alias): Remove pointer-set. Update for may_aliases being
+       a bitmap. 
+       (mark_aliases_call_clobbered): Update for may_aliases being a
+       bitmap.
+       (compute_tag_properties): Ditto.
+       (create_partition_for): Ditto.
+       (compute_memory_partitions): Ditto.
+       (dump_may_aliases_for): Ditto.
+       (is_aliased_with): Ditto.
+       (add_may_alias_for_new_tag): Ditto.
+       (rewrite_alias_set_for): Rewrite for may_aliases being a bitmap.
+       (compute_is_aliased): New function.
+       (compute_may_aliases): Call compute_is_aliased).
+       (init_alias_info): Initialize alias_bitmap_obstack.
+       (union_alias_set_into): New function.
+       (compute_flow_sensitive_aliasing): Use union_aliases_into.
+       (have_common_aliases_p): Rewrite to take two bitmaps and use
+       intersection.
+       (compute_flow_insensitive_aliasing): Stop using pointer-sets.
+       Update for bitmaps.
+       (finalize_ref_all_pointers): Update for add_may_alias changes.
+       (new_type_alias): Ditto.
+       * tree-flow-inline.h (may_aliases): Return a bitmap.
+       * tree-dfa.c (dump_variable): Check for MTAG_P'ness.
+       * tree-ssa.c (verify_flow_insensitive_alias_info): Update for
+       may_aliases being a bitmap.
+       * tree-flow.h (struct var_ann_d): Remove may_aliases member.
+       may_aliases now returns a bitmap.
+       * tree-ssa-structalias.c (merge_smts_into): Update for may_aliases
+       being a bitmap.
+       * tree-ssa-operands.c (add_virtual_operand): Update for
+       may_aliases being a bitmap.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31090