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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/104124] Poor optimization for vector splat DW with small
 consts
Date: Wed, 28 Jun 2023 08:39:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104124

--- Comment #4 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:f3d87219dd502d5c11608ffb83fbe66c79baf784

commit r14-2153-gf3d87219dd502d5c11608ffb83fbe66c79baf784
Author: Haochen Gui <guihaoc@gcc.gnu.org>
Date:   Wed Jun 28 16:30:44 2023 +0800

    rs6000: Splat vector small V2DI constants with vspltisw and vupkhsw

    This patch adds a new insn for vector splat with small V2DI constants on
P8.
    If the value of constant is in RANGE (-16, 15) but not 0 or -1, it can =
be
    loaded with vspltisw and vupkhsw on P8.

    gcc/
            PR target/104124
            * config/rs6000/altivec.md (*altivec_vupkhs<VU_char>_direct):
Rename
            to...
            (altivec_vupkhs<VU_char>_direct): ...this.
            * config/rs6000/predicates.md (vspltisw_vupkhsw_constant_split):
New
            predicate to test if a constant can be loaded with vspltisw and
            vupkhsw.
            (easy_vector_constant): Call vspltisw_vupkhsw_constant_p to Che=
ck
if
            a vector constant can be synthesized with a vspltisw and a vupk=
hsw.
            * config/rs6000/rs6000-protos.h (vspltisw_vupkhsw_constant_p):
            Declare.
            * config/rs6000/rs6000.cc (vspltisw_vupkhsw_constant_p): New
            function to return true if OP mode is V2DI and can be synthesiz=
ed
            with vupkhsw and vspltisw.
            * config/rs6000/vsx.md (*vspltisw_v2di_split): New insn to load=
 up
            constants with vspltisw and vupkhsw.

    gcc/testsuite/
            PR target/104124
            * gcc.target/powerpc/pr104124.c: New.=