[Bug middle-end/18041] OR of two single-bit bitfields is inefficient

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=18041

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Nov  6 08:09:03 2018
New Revision: 265829

URL: https://gcc.gnu.org/viewcvs?rev=265829&root=gcc&view=rev
Log:
2018-11-06  Richard Biener  <rguent...@suse.de>

        PR middle-end/18041
        * simplify-rtx.c (simplify_binary_operation_1): Add pattern
        matching bitfield insertion.

        * gcc.target/i386/pr18041-1.c: New testcase.
        * gcc.target/i386/pr18041-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr18041-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr18041-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog