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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109764] New: V2SI multiply high is not
 vectorized on x86_64
Date: Sun, 07 May 2023 16:21:37 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109764

            Bug ID: 109764
           Summary: V2SI multiply high is not vectorized on x86_64
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
  Target Milestone: ---

The folowing testcase:

--cut here--
#define N 2

unsigned int ur[N], ua[N], ub[N];

void mulh (void)
{
  int i;

  for (i =3D 0; i < N; i++)
    ur[i] =3D ((unsigned long) ua[i] * ub[i]) >> 32;
}

void mulh_slp (void)
{
  ur[0] =3D ((unsigned long) ua[0] * ub[0]) >> 32;
  ur[1] =3D ((unsigned long) ua[1] * ub[1]) >> 32;
}
--cut here--

should vectorize on x86_64 with the patch I'm going to attach, and with
-fno-vect-cost-model. The compiler however does not even consider
"<s>mulv2si3_highpart" pattern.=