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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/54346] combine permutations
Date: Wed, 25 Aug 2021 09:02:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D54346

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is example code which should produce the same code:
typedef int v4si __attribute__((vector_size (16)));

v4si
foo (v4si a, v4si b)
{
    v4si c =3D __builtin_shuffle (a, b, __extension__ (v4si) {1, 4, 2, 7});
    v4si d =3D __builtin_shuffle (c, __extension__ (v4si) { 3, 2, 0, 1 });
    return d;
}

typedef int v4si __attribute__((vector_size (16)));

v4si
foo1 (v4si a, v4si b)
{
    v4si c =3D __builtin_shuffle (a, b, __extension__ (v4si){ 7, 2, 1, 4 });
    return c;
}=