[Bug target/15184] [4.8/4.9/5 Regression] Direct access to byte inside word not working with -march=pentiumpro

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15184

--- Comment #32 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Jan 29 14:30:45 2015
New Revision: 220249

URL: https://gcc.gnu.org/viewcvs?rev=220249&root=gcc&view=rev
Log:
    PR target/15184
    * combine.c (try_combine): If I0 is a memory load and I3 a store
    to a related address, increase the "goodness" of doing a 4-insn
    combination with I0-I3.
    (make_field_assignment): Handle SUBREGs in the ior+and case.

    PR target/15184
    * gcc.target/i386/pr15184-1.c: New test.
    * gcc.target/i386/pr15184-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr15184-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr15184-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog