[Bug tree-optimization/58223] [4.8 Regression] wrong code at -O3 on x86_64-linux-gnu

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58223

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Sep  9 09:47:24 2013
New Revision: 202385

URL: http://gcc.gnu.org/viewcvs?rev=202385&root=gcc&view=rev
Log:
2013-09-09  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2013-08-30  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/58223
    * tree-loop-distribution.c (has_anti_dependence): Rename to ...
    (has_anti_or_output_dependence): ... this and adjust to also
    look for output dependences.
    (mark_nodes_having_upstream_mem_writes): Adjust.
    (rdg_flag_uses): Likewise.

    * gcc.dg/torture/pr58223.c: New testcase.
    * gcc.dg/tree-ssa/ldist-16.c: Flip expected behavior.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr58223.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/tree-ssa/ldist-16.c
    branches/gcc-4_8-branch/gcc/tree-loop-distribution.c