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Subject: [Bug middle-end/100267] gcc -O2 for avx512 instrincts generates
 extra warnings and less optimizations
Date: Tue, 22 Jun 2021 01:35:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100267

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:f51618f301664d02cc41205f1386c0c9b9a29a54

commit r12-1706-gf51618f301664d02cc41205f1386c0c9b9a29a54
Author: liuhongt <hongtao.liu@intel.com>
Date:   Thu Apr 29 18:27:09 2021 +0800

    Optimize vpexpand* to mask mov when mask have all ones in it's lower pa=
rt
(including 0 and -1).

    gcc/ChangeLog:

            PR target/100267
            * config/i386/i386-builtin.def (BDESC): Adjust builtin name.
            * config/i386/sse.md (<avx512>_expand<mode>_mask): Rename to ..
            (expand<mode>_mask): this ..
            (*expand<mode>_mask): New pre_reload splitter to transform
            v{,p}expand* to vmov* when mask is zero, all ones, or has all
            ones in it's lower part, otherwise still generate
            v{,p}expand*.

    gcc/testsuite/ChangeLog:

            PR target/100267
            * gcc.target/i386/avx512bw-pr100267-1.c: New test.
            * gcc.target/i386/avx512bw-pr100267-b-2.c: New test.
            * gcc.target/i386/avx512bw-pr100267-d-2.c: New test.
            * gcc.target/i386/avx512bw-pr100267-q-2.c: New test.
            * gcc.target/i386/avx512bw-pr100267-w-2.c: New test.
            * gcc.target/i386/avx512f-pr100267-1.c: New test.
            * gcc.target/i386/avx512f-pr100267-pd-2.c: New test.
            * gcc.target/i386/avx512f-pr100267-ps-2.c: New test.
            * gcc.target/i386/avx512vl-pr100267-1.c: New test.
            * gcc.target/i386/avx512vl-pr100267-pd-2.c: New test.
            * gcc.target/i386/avx512vl-pr100267-ps-2.c: New test.
            * gcc.target/i386/avx512vlbw-pr100267-1.c: New test.
            * gcc.target/i386/avx512vlbw-pr100267-b-2.c: New test.
            * gcc.target/i386/avx512vlbw-pr100267-d-2.c: New test.
            * gcc.target/i386/avx512vlbw-pr100267-q-2.c: New test.
            * gcc.target/i386/avx512vlbw-pr100267-w-2.c: New test.=