[Bug target/85628] Make better use of BFI (BFXIL)

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85628

--- Comment #2 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Thu Sep 13 09:46:55 2018
New Revision: 264264

URL: https://gcc.gnu.org/viewcvs?rev=264264&root=gcc&view=rev
Log:
[Aarch64] Exploiting BFXIL when OR-ing two AND-operations with appropriate
bitmasks

2018-09-13  Sam Tebbs  <sam.te...@arm.com>

        PR target/85628
        * config/aarch64/aarch64.md (*aarch64_bfxil):
        Define.
        * config/aarch64/constraints.md (Ulc): Define.
        * config/aarch64/aarch64-protos.h (aarch64_high_bits_all_ones_p):
        Define.
        * config/aarch64/aarch64.c (aarch64_high_bits_all_ones_p):
        New function.

        * gcc.target/aarch64/combine_bfxil.c: New file.
        * gcc.target/aarch64/combine_bfxil_2.c: New file.

Added:
    trunk/gcc/testsuite/gcc.target/aarch64/combine_bfxil.c
    trunk/gcc/testsuite/gcc.target/aarch64/combine_bfxil_2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/aarch64-protos.h
    trunk/gcc/config/aarch64/aarch64.c
    trunk/gcc/config/aarch64/aarch64.md
    trunk/gcc/config/aarch64/constraints.md
    trunk/gcc/testsuite/ChangeLog