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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102583] [x86] Failure to optimize 32-byte
 integer vector conversion to 16-byte float vector properly when converting
 upper part with -mavx2
Date: Tue, 25 Jan 2022 06:32:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102583

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
Simplify
  _4 =3D VEC_PERM_EXPR <_1, _1, { 4, 5, 6, 7, 4, 5, 6, 7 }>;
  _5 =3D BIT_FIELD_REF <_4, 128, 0>;

to

_5 =3D BIT_FIELD_REF <_1, 128, 128>;

in match.pd?=