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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94680] Missed optimization with __builtin_shuffle and
 zero vector
Date: Tue, 21 Apr 2020 08:38:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94680

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |uros at gcc dot gnu.org
             Target|                            |x86_64-linux

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
typedef float V __attribute__((vector_size(32)));
typedef int VI __attribute__((vector_size(32)));

V
foo (V x)
{
  return __builtin_shuffle (x, (V) { 0, 0, 0, 0, 0, 0, 0, 0 }, (VI) { 0, 1,=
 2,
3, 8, 9, 10, 11 });
}

with -mavx similarly could be done just using vmovps.
Or
typedef float V __attribute__((vector_size(64)));
typedef int VI __attribute__((vector_size(64)));

V
foo (V x)
{
  return __builtin_shuffle (x, (V) { 0 }, (VI) { 0, 1, 2, 3, 4, 5, 6, 7, 16,
17, 18, 19, 20, 21, 22, 23 });
}
using -mavx512f.=