[Bug rtl-optimization/42691] [4.4/4.5 regression] problematic REG_EQUAL note added to SUBREG

[jingyu at gcc dot gnu dot org]

------- Comment #22 from jingyu at gcc dot gnu dot org  2010-01-15 22:11 -------
Subject: Bug 42691

Author: jingyu
Date: Fri Jan 15 22:11:43 2010
New Revision: 155949

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155949
Log:
Backport from mainline(4.5) to fix a regression bug.

2010-01-15  Jing Yu  <jingyu@google.com>

        PR rtl-optimization/42691
        * combine.c (try_combine): Set changed_i3_dest to 1 when I2 and I3 set
        a pseudo to a constant and are merged, and adjust comments.

        2010-01-15  Jing Yu  <jingyu@google.com>

        PR rtl-optimization/42691
        * gcc.c-torture/execute/pr42691.c: New.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/execute/pr42691.c
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/combine.c
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42691