[Bug tree-optimization/63841] [4.8 Regression] Incorrect strlen optimization after complete unroll

[tejohnson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63841

--- Comment #12 from tejohnson at gcc dot gnu.org ---
Author: tejohnson
Date: Thu Nov 20 14:29:41 2014
New Revision: 217858

URL: https://gcc.gnu.org/viewcvs?rev=217858&root=gcc&view=rev
Log:
2014-11-20  Teresa Johnson  <tejohnson@google.com>

    Backport r217522 from gcc-4_9 for Google ref b/18344370 and b/18455179.

    2014-11-13  Teresa Johnson  <tejohnson@google.com>

    PR tree-optimization/63841
    * tree-ssa-strlen.c (strlen_optimize_stmt): Ignore clobbers.

    2014-11-13  Teresa Johnson  <tejohnson@google.com>

    PR tree-optimization/63841
    * testsuite/g++.dg/tree-ssa/pr63841.C: New test.

Added:
    branches/google/gcc-4_9/gcc/testsuite/g++.dg/tree-ssa/pr63841.C
Modified:
    branches/google/gcc-4_9/gcc/tree-ssa-strlen.c