[Bug target/95524] Subtimal codegen for shift by constant for v16qi/v32qi under -march=skylake

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95524

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>:

https://gcc.gnu.org/g:c7199fb6e694d1a0964351200648c24c3ee97973

commit r11-1411-gc7199fb6e694d1a0964351200648c24c3ee97973
Author: liuhongt <hongtao....@intel.com>
Date:   Mon Jun 15 13:48:45 2020 +0800

    Optimize V16QI/V32QI/V64QI shift by constant.

    gcc/ChangeLog:
            PR target/95524
            * config/i386/i386-expand.c
            (ix86_expand_vec_shift_qihi_constant): New function.
            * config/i386/i386-protos.h
            (ix86_expand_vec_shift_qihi_constant): Declare.
            * config/i386/sse.md (<shift_insn><mode>3): Optimize shift
            V*QImode by constant.

    gcc/testsuite/ChangeLog:
            * gcc.target/i386/avx2-shiftqihi-constant-1.c: New test.
            * gcc.target/i386/avx2-shiftqihi-constant-2.c: Ditto.
            * gcc.target/i386/avx512bw-shiftqihi-constant-1.c: Ditto.
            * gcc.target/i386/avx512bw-shiftqihi-constant-2.c: Ditto.
            * gcc.target/i386/sse2-shiftqihi-constant-1.c: Ditto.
            * gcc.target/i386/sse2-shiftqihi-constant-2.c: Ditto.