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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94865] Failure to combine unpckhpd+unpcklpd into blendps
Date: Thu, 30 Apr 2020 07:09:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94865

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2020-04-30
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Similar as PR94864.  I'll note that x86 might fare better if on GIMPLE inst=
ead
of

  _1 =3D BIT_FIELD_REF <b_3(D), 64, 64>;
  result_4 =3D BIT_INSERT_EXPR <a_2(D), _1, 64>;
  return result_4;

we had a VEC_PERM but IIRC for two-element vectors this regressed some case=
s.
Note for this case the IL looks like above from the start so pattern-matchi=
ng
a insert of an element from another vector to a permute might be a possibil=
ity
as well.=