[Bug rtl-optimization/70484] [4.9/5/6 Regression] Wrong optimization with aliasing and access via char

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70484

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr  4 09:30:16 2016
New Revision: 234709

URL: https://gcc.gnu.org/viewcvs?rev=234709&root=gcc&view=rev
Log:
2016-04-04  Richard Biener  <rguenther@suse.de>

        PR rtl-optimization/70484
        * rtl.h (canon_output_dependence): Declare.
        * alias.c (canon_output_dependence): New function.
        * dse.c (record_store): Use canon_output_dependence rather
        than canon_true_dependence.

        * gcc.dg/torture/pr70484.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr70484.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/alias.c
    trunk/gcc/dse.c
    trunk/gcc/rtl.h
    trunk/gcc/testsuite/ChangeLog