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Subject: [Bug target/100711] Miss optimization for pandn
Date: Tue, 30 Nov 2021 08:37:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100711

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:

https://gcc.gnu.org/g:c39d77f252e895306ef88c1efb3eff04e4232554

commit r12-5595-gc39d77f252e895306ef88c1efb3eff04e4232554
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Tue Nov 30 08:35:39 2021 +0000

    x86_64: PR target/100711: Splitters for pandn

    This patch addresses PR target/100711 by introducing define_split
    patterns so that not/broadcast/pand may be simplified (by combine)
    to broadcast/pandn.  This introduces two splitters one for optimizing
    pandn on TARGET_SSE for V4SI and V2DI, and another for vpandn on
    TARGET_AVX2 for V16QI, V8HI, V32QI, V16HI and V8SI.  Each splitter
    has its own new testcase.

    I've also confirmed that not/broadcast/pandn is already getting
    simplified to broadcast/pand by the middle-end optimizers.

    2021-11-30  Roger Sayle  <roger@nextmovesoftware.com>
                Uro=C3=85=C2=A1 Bizjak  <ubizjak@gmail.com>

    gcc/ChangeLog
            PR target/100711
            * config/i386/sse.md (define_split): New splitters to simplify
            not;vec_duplicate;and as vec_duplicate;andn.

    gcc/testsuite/ChangeLog
            PR target/100711
            * gcc.target/i386/pr100711-1.c: New test case.
            * gcc.target/i386/pr100711-2.c: New test case.=