https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78437

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Thu Nov 24 15:01:32 2016
New Revision: 242839

URL: https://gcc.gnu.org/viewcvs?rev=242839&root=gcc&view=rev
Log:
        PR rtl-optimization/78437
        * ree.c (get_uses): New function.
        (combine_reaching_defs): When a copy is needed, return false if any
        reaching use of the source register reads it in a mode larger than
        the mode it is set in and WORD_REGISTER_OPERATIONS is true.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ree.c

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