[Bug rtl-optimization/68376] [4.9 Regression] wrong code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68376

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Feb 11 09:11:58 2016
New Revision: 233323

URL: https://gcc.gnu.org/viewcvs?rev=233323&root=gcc&view=rev
Log:
        Backported from mainline
        2015-12-10  Jakub Jelinek  <jakub@redhat.com>

        PR rtl-optimization/68376
        PR rtl-optimization/68670
        * ifcvt.c (noce_try_abs): For one_cmpl allow < 0, >= 0
        or > -1 conditions regardless of negate, and disallow
        all other conditions.

        * gcc.c-torture/execute/pr68376-2.c (f5, f6, f7, f8): New
        tests.
        (main): Call them.
        * gcc.dg/pr68670-1.c: New test.
        * gcc.dg/pr68670-2.c: New test.

        2015-11-19  Jakub Jelinek  <jakub@redhat.com>

        PR rtl-optimization/68376
        * ifcvt.c (noce_try_abs): Disable one_cmpl optimization if
        encountering x <= 0 ? ~x : x or x > 0 ? ~x : x.

        * gcc.c-torture/execute/pr68376-1.c: New test.
        * gcc.c-torture/execute/pr68376-2.c: New test.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.c-torture/execute/pr68376-1.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.c-torture/execute/pr68376-2.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/pr68670-1.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/pr68670-2.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/ifcvt.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog