[Bug regression/40886] [4.3/4.4/4.5 Regression] No loop counter reversal for simple loops anymore

[spop at gcc dot gnu dot org]

------- Comment #13 from spop at gcc dot gnu dot org  2010-02-11 15:45 -------
Subject: Bug 40886

Author: spop
Date: Thu Feb 11 15:45:27 2010
New Revision: 156701

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156701
Log:
Fix PR40886.

2010-02-11  Sebastian Pop  <sebastian.pop@amd.com>
            Changpeng Fang  <changpeng.fang@amd.com>

        PR middle-end/40886
        * tree-ssa-loop-ivopts.c (determine_use_iv_cost_condition): Decrement
        the cost of an IV candidate when the IV is used in a test against zero.

        * gcc.dg/tree-ssa/ivopts-3.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopts-3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-loop-ivopts.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40886