[Bug tree-optimization/72824] [5/6 Regression] Signed floating point zero semantics broken at optimization level -O3 (tree-loop-distribute-patterns)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72824

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Aug 10 12:16:39 2016
New Revision: 239319

URL: https://gcc.gnu.org/viewcvs?rev=239319&root=gcc&view=rev
Log:
        Backported from mainline
        2016-08-09  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/72824
        * tree-loop-distribution.c (const_with_all_bytes_same): Verify
        real_zerop is not negative.

        * gcc.c-torture/execute/ieee/pr72824.c: New test.

Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.c-torture/execute/ieee/pr72824.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/testsuite/ChangeLog
    branches/gcc-6-branch/gcc/tree-loop-distribution.c