[Bug rtl-optimization/69941] bogus zero_extend transformation in postreload on aarch64

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69941

--- Comment #7 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Author: bernds
Date: Tue Mar 15 03:14:38 2016
New Revision: 234210

URL: https://gcc.gnu.org/viewcvs?rev=234210&root=gcc&view=rev
Log:
Backport PR69941 patch from mainline.

        PR rtl-optimization/69941
        * postreload.c (reload_combine_recognize_pattern): Ensure all uses of
        the reg share its mode.

        PR rtl-optimization/69941
        * gcc.dg/torture/pr69941.c: New test.

Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr69941.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/postreload.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog