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Subject: [Bug tree-optimization/96938] Failure to optimize bit-setting
 pattern when not using temporary
Date: Wed, 13 Jan 2021 09:16:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96938

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:5d057bfeff70e5b8d00e521844c476f62d51e22c

commit r11-6631-g5d057bfeff70e5b8d00e521844c476f62d51e22c
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Jan 13 10:15:13 2021 +0100

    i386: Add define_insn_and_split patterns for btrl [PR96938]

    In the following testcase we only optimize f2 and f7 to btrl, although =
we
    should optimize that way all of the functions.  The problem is the type
    demotion/narrowing (which is performed solely during the generic folding
and
    not later), without it we see the AND performed in SImode and match it =
as
    btrl, but with it while the shifts are still performed in SImode, the
    AND is already done in QImode or HImode low part of the shift.

    2021-01-13  Jakub Jelinek  <jakub@redhat.com>

            PR target/96938
            * config/i386/i386.md (*btr<mode>_1, *btr<mode>_2): New
            define_insn_and_split patterns.
            (splitter after *btr<mode>_2): New splitter.

            * gcc.target/i386/pr96938.c: New test.=