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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94864] New: Failure to combine
 vunpckhpd+movsd into single vunpckhpd
Date: Wed, 29 Apr 2020 21:59:54 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 10.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94864

            Bug ID: 94864
           Summary: Failure to combine vunpckhpd+movsd into single
                    vunpckhpd
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

typedef double v2df __attribute__((vector_size(16)));

v2df move_sd(v2df a, v2df b)
{
    v2df result =3D a;
    result[0] =3D b[1];
    return result;
}

LLVM outputs this :

move_sd(double __vector(2), double __vector(2)): # @move_sd(double __vector=
(2),
double __vector(2))
  vunpckhpd xmm0, xmm1, xmm0 # xmm0 =3D xmm1[1],xmm0[1]
  ret

GCC outputs this :=20

move_sd(double __vector(2), double __vector(2)):
  vunpckhpd xmm1, xmm1, xmm1
  vmovsd xmm0, xmm0, xmm1
  ret=