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Subject: [Bug target/101846] Improve __builtin_shufflevector emitted code
Date: Mon, 16 Aug 2021 07:30:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101846

--- Comment #6 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:faf2b6bc527dff31725dde5538ffff1c92688047

commit r12-2919-gfaf2b6bc527dff31725dde5538ffff1c92688047
Author: liuhongt <hongtao.liu@intel.com>
Date:   Mon Aug 16 11:16:52 2021 +0800

    Optimize __builtin_shuffle_vector.

    1. Support vpermw/vpermb in ix86_expand_vec_one_operand_perm_avx512.
    2. Support 256/128-bits vpermi2b ix86_expand_vec_perm_vpermt2.
    3. Add define_insn_and_split to optimize specific vector permutation to
opmov{dw,wb,qd}.

    gcc/ChangeLog:

            PR target/101846
            * config/i386/i386-expand.c (ix86_expand_vec_perm_vpermt2):
            Support vpermi2b for V32QI/V16QImode.
            (ix86_extract_perm_from_pool_constant): New function.
            (ix86_expand_vec_one_operand_perm_avx512): Support
            vpermw/vpermb under TARGET_AVX512BW/TARGET_AVX512VBMI.
            (expand_vec_perm_1): Adjust comments for upper.
            * config/i386/i386-protos.h (ix86_extract_perm_from_pool_consta=
nt):
            New declare.
            * config/i386/predicates.md (permvar_truncate_operand): New
predicate.
            (pshufb_truncv4siv4hi_operand): Ditto.
            (pshufb_truncv8hiv8qi_operand): Ditto.
            * config/i386/sse.md (*avx512bw_permvar_truncv16siv16hi_1):
            New pre_reload define_insn_and_split.
            (*avx512f_permvar_truncv8siv8hi_1): Ditto.
            (*avx512f_vpermvar_truncv8div8si_1): Ditto.
            (*avx512f_permvar_truncv32hiv32qi_1): Ditto.
            (*avx512f_permvar_truncv16hiv16qi_1): Ditto.
            (*avx512f_permvar_truncv4div4si_1): Ditto.
            (*avx512f_pshufb_truncv8hiv8qi_1): Ditto.
            (*avx512f_pshufb_truncv4siv4hi_1): Ditto.
            (*avx512f_pshufd_truncv2div2si_1): Ditto.

    gcc/testsuite/ChangeLog:

            PR target/101846
            * gcc.target/i386/pr101846-2.c: New test.
            * gcc.target/i386/pr101846-3.c: New test.
            * gcc.target/i386/pr101846-4.c: New test.=