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Subject: [Bug tree-optimization/88713] Vectorized code slow vs. flang
Date: Thu, 09 Jul 2020 13:40:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88713

--- Comment #59 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:fab263ab0fc10ea08409b80afa7e8569438b8d28

commit r11-1970-gfab263ab0fc10ea08409b80afa7e8569438b8d28
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jan 23 06:33:58 2019 -0800

    x86: Enable FMA in rsqrt<mode>2 expander

    Enable FMA in rsqrt<mode>2 expander and fold rsqrtv16sf2 expander into
    rsqrt<mode>2 expander which expands to UNSPEC_RSQRT28 for TARGET_AVX512=
ER.
    Although it doesn't show performance change in our workloads, FMA can
    improve other workloads.

    gcc/

            PR target/88713
            * config/i386/i386-expand.c (ix86_emit_swsqrtsf): Enable FMA.
            * config/i386/sse.md (VF_AVX512VL_VF1_128_256): New.
            (rsqrt<mode>2): Replace VF1_128_256 with VF_AVX512VL_VF1_128_25=
6.
            (rsqrtv16sf2): Removed.

    gcc/testsuite/

            PR target/88713
            * gcc.target/i386/pr88713-1.c: New test.
            * gcc.target/i386/pr88713-2.c: Likewise.=