[Bug rtl-optimization/67828] [6 Regression] wrong code at -O3 on x86_64-linux-gnu

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67828

--- Comment #7 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Fri Oct  9 12:18:24 2015
New Revision: 228650

URL: https://gcc.gnu.org/viewcvs?rev=228650&root=gcc&view=rev
Log:
[PR67828] don't unswitch on default defs of non-parms

for  gcc/ChangeLog

        PR rtl-optimizatoin/67828
        * tree-ssa-loop-unswitch.c: Include tree-ssa.h.
        (tree_may_unswitch_on): Don't unswitch on expressions
        involving undefined values.

for  gcc/testsuite/ChangeLog

        PR rtl-optimization/67828
        * gcc.dg/torture/pr67828.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr67828.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-unswitch.c