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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/54346] combine permutations
Date: Tue, 11 Oct 2022 06:12:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D54346

--- Comment #5 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:b88adba751da635c6f0c353c5bc51bbe2ecf4c89

commit r13-3212-gb88adba751da635c6f0c353c5bc51bbe2ecf4c89
Author: Liwei Xu <liwei.xu@intel.com>
Date:   Fri Sep 23 13:46:02 2022 +0800

    Optimize nested permutation to single VEC_PERM_EXPR [PR54346]

            This patch implemented the optimization in PR 54346, which Merg=
es

            c =3D VEC_PERM_EXPR <a, b, VCST0>;
            d =3D VEC_PERM_EXPR <c, c, VCST1>;
                    to
            d =3D VEC_PERM_EXPR <a, b, NEW_VCST>;

            Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}
            tree-ssa/forwprop-19.c fail to pass but I'm not sure whether it
            is ok to removed it.

    gcc/ChangeLog:

            PR tree-optimization/54346
            * match.pd: Merge the index of VCST then generates the new
vec_perm.

    gcc/testsuite/ChangeLog:

            * gcc.dg/pr54346.c: New test.

    Co-authored-by: liuhongt <hongtao.liu@intel.com>=