[Bug rtl-optimization/69891] wrong code with -mstringop-strategy=libcall @ i686

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69891

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jul  7 21:47:40 2016
New Revision: 238137

URL: https://gcc.gnu.org/viewcvs?rev=238137&root=gcc&view=rev
Log:
        Backported from mainline
        2016-02-26  Jakub Jelinek  <ja...@redhat.com>
                    Eric Botcazou  <ebotca...@adacore.com>

        PR rtl-optimization/69891
        * dse.c (scan_insn): If we can't figure out memset arguments
        or they are non-constant, call clear_rhs_from_active_local_stores.

        * gcc.target/i386/pr69891.c: New test.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.target/i386/pr69891.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/dse.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog