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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/111449] memcmp (p,q,16) == 0 can be optimized better on
 ppc64 with vector comparison instructions
Date: Mon, 30 Oct 2023 03:03:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111449

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by HaoChen Gui <guihaoc@gcc.gnu.org>:

https://gcc.gnu.org/g:8111b5c23bd14f80607bd35af58ec31e38a0378e

commit r14-5001-g8111b5c23bd14f80607bd35af58ec31e38a0378e
Author: Haochen Gui <guihaoc@gcc.gnu.org>
Date:   Mon Oct 30 10:59:51 2023 +0800

    Expand: Checking available optabs for scalar modes in by pieces operati=
ons

    The former patch (f08ca5903c7) examines the scalar modes by target
    hook scalar_mode_supported_p.  It causes some i386 regression cases
    as XImode and OImode are not enabled in i386 target function.  This
    patch examines the scalar mode by checking if the corresponding optabs
    are available for the mode.

    gcc/
            PR target/111449
            * expr.cc (qi_vector_mode_supported_p): Rename to...
            (by_pieces_mode_supported_p): ...this, and extends it to do
            the checking for both scalar and vector mode.
            (widest_fixed_size_mode_for_size): Call
            by_pieces_mode_supported_p to examine the mode.
            (op_by_pieces_d::smallest_fixed_size_mode_for_size): Likewise.=