[Bug tree-optimization/82291] [8 Regression] wrong code at -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82291

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Sep 22 12:00:55 2017
New Revision: 253093

URL: https://gcc.gnu.org/viewcvs?rev=253093&root=gcc&view=rev
Log:
2017-09-22  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/82291
        * tree-if-conv.c (predicate_mem_writes): Make sure to
        remove writes in blocks predicated with false.

        * gcc.dg/torture/pr82291.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr82291.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-if-conv.c