[Bug rtl-optimization/64286] [4.9 Regression] Redundant extend removal ignores vector element type

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64286

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 14 20:24:05 2015
New Revision: 219614

URL: https://gcc.gnu.org/viewcvs?rev=219614&root=gcc&view=rev
Log:
    Backported from mainline
    2015-01-13  Jakub Jelinek  <jakub@redhat.com>

    PR rtl-optimization/64286
    * ree.c (combine_reaching_defs): Move part of comment earlier,
    remove !SCALAR_INT_MODE_P check.
    (add_removable_extension): Don't add vector mode
    extensions if all uses of the source register aren't the same
    vector extensions.

    * gcc.target/i386/avx2-pr64286.c: New test.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.target/i386/avx2-pr64286.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/ree.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog