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Subject: [Bug tree-optimization/54498] [4.6/4.7/4.8 Regression] incorrect code generation from g++ -O
Date: Thu, 06 Sep 2012 14:48:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54498

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-06 14:47:50 UTC ---
Author: rguenth
Date: Thu Sep  6 14:47:42 2012
New Revision: 191030

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191030
Log:
2012-09-06  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/54498
    * tree-ssa-alias.h (get_continuation_for_phi): Add flag to
    abort when reaching an already visited region.
    * tree-ssa-alias.c (maybe_skip_until): Likewise.  And do it.
    (get_continuation_for_phi_1): Likewise.
    (walk_non_aliased_vuses): When we translated the reference,
    abort when we re-visit a region.
    * tree-ssa-pre.c (translate_vuse_through_block): Adjust.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-alias.h
    trunk/gcc/tree-ssa-pre.c