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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/101021] PSHUFB is emitted instead of PSHUFD, PSHUFLW and
 PSHUFHW with -msse4
Date: Fri, 11 Jun 2021 07:35:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101021

Uro=C5=A1 Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-06-11
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail do=
t com
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Created attachment 50982
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50982&action=3Dedit
Proposed patch

Effectively one liner patch with:

+  /* Try to avoid variable permutation instruction.  */
+  if (canonicalize_vector_int_perm (d, &nd) && expand_vec_perm_1 (&nd))
+    return false;

in a strategic place.

Survives:

GCC_TEST_RUN_EXPENSIVE=3D1 make check-gcc RUNTESTFLAGS=3D'--target_board=3D=
unix/-mavx
dg-torture.exp=3Dvshuf*.c'=