[Bug rtl-optimization/71984] [7 Regression] wrong code with -O -mavx512cd

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71984

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jul 26 14:11:21 2016
New Revision: 238757

URL: https://gcc.gnu.org/viewcvs?rev=238757&root=gcc&view=rev
Log:
2016-07-26  Richard Biener  <rguent...@suse.de>

        PR rtl-optimization/71984
        * simplify-rtx.c (simplify_subreg): Use GET_MODE_SIZE and prepare
        for VOIDmode.

        * gcc.dg/torture/pr71984.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr71984.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog