[Bug tree-optimization/63841] [4.8/4.9/5 Regression] Incorrect strlen optimization after complete unroll

[tejohnson at gcc dot gnu.org]

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

--- Comment #5 from tejohnson at gcc dot gnu.org ---
Author: tejohnson
Date: Thu Nov 13 15:36:48 2014
New Revision: 217505

URL: https://gcc.gnu.org/viewcvs?rev=217505&root=gcc&view=rev
Log:
2014-11-13  Teresa Johnson  <tejohn...@google.com>

gcc:
    PR tree-optimization/63841
    * tree.c (initializer_zerop): A clobber does not zero initialize.

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

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr63841.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree.c