[Bug tree-optimization/57230] [4.7/4.8/4.9 Regression] tree-ssa-strlen incorrectly optimizes a strlen to 0

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57230

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Jun  4 11:59:45 2014
New Revision: 211225

URL: http://gcc.gnu.org/viewcvs?rev=211225&root=gcc&view=rev
Log:
2014-06-04  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2013-05-13  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/57230
    * tree-ssa-strlen.c (handle_char_store): Add missing integer_zerop
    check.

    * gcc.dg/strlenopt-23.c: New test.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/strlenopt-23.c
Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_7-branch/gcc/tree-ssa-strlen.c