[Bug middle-end/71310] Bitfields cause load hit store with smaller store and larger load

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71310

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jun 14 07:26:52 2016
New Revision: 237426

URL: https://gcc.gnu.org/viewcvs?rev=237426&root=gcc&view=rev
Log:
2016-06-14  Richard Biener  <rguenther@suse.de>

        PR middle-end/71310
        PR bootstrap/71510
        * expr.h (get_bit_range): Declare.
        * expr.c (get_bit_range): Export.
        * fold-const.c (optimize_bit_field_compare): Use get_bit_range and
        word_mode again to constrain the bitfield access.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/expr.h
    trunk/gcc/fold-const.c