[Bug middle-end/69547] [6 regression] no-op array initializer emits an empty loop

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69547

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jan 29 11:21:19 2016
New Revision: 232976

URL: https://gcc.gnu.org/viewcvs?rev=232976&root=gcc&view=rev
Log:
2016-01-29  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/69547
        * tree-ssa-dce.c (mark_aliased_reaching_defs_necessary_1):
        Do not mark clobbers necessary.
        (mark_all_reaching_defs_necessary_1): Likewise.

        * g++.dg/tree-ssa/pr69547.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr69547.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dce.c