[Bug tree-optimization/60656] [4.8 regression] x86 vectorization produces wrong code

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60656

--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Jun 10 12:53:09 2015
New Revision: 224327

URL: https://gcc.gnu.org/viewcvs?rev=224327&root=gcc&view=rev
Log:
2015-06-10  Richard Biener  <rguenther@suse.de>

        Backport from mainline
        2014-04-04  Cong Hou  <congh@google.com>

        PR tree-optimization/60656
        * tree-vect-stmts.c (supportable_widening_operation):
        Fix a bug that elements in a vector with vect_used_by_reduction
        property are incorrectly reordered when the operation on it is not
        consistant with the one in reduction operation.

        * gcc.dg/vect/pr60656.c: New test.

        2014-01-31  Richard Biener  <rguenther@suse.de>

        PR middle-end/59990
        * builtins.c (fold_builtin_memory_op): Make sure to not
        use a floating-point mode or a boolean or enumeral type for
        the copy operation.

        * gcc.dg/torture/pr59990.c: New testcase.
        * gcc.target/i386/pr49168-1.c: Adjust.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr59990.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/vect/pr60656.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/builtins.c
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/gcc.target/i386/pr49168-1.c
    branches/gcc-4_8-branch/gcc/tree-vect-stmts.c