[Bug middle-end/40815] redundant neg instruction caused by loop-invariant

[mkuvyrkov at gcc dot gnu dot org]

------- Comment #10 from mkuvyrkov at gcc dot gnu dot org  2010-04-08 08:20 -------
Subject: Bug 40815

Author: mkuvyrkov
Date: Thu Apr  8 08:20:36 2010
New Revision: 158105

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158105
Log:
        PR middle-end/40815
        * tree-ssa-reassoc.c (broken_up_substracts): Rename to plus_negates.
        (negate_value): Move code to push elements to broken_up_substracts ...
        (eliminate_plus_minus_pair): ... here.  Push operands that have no
        negative pair to plus_negates.
        (repropagate_negates, init_reassoc, fini_reassoc): Update.

        PR middle-end/40815
        * gcc.dg/tree-ssa/reassoc-19.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/reassoc-19.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40815