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From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109885] New: gcc does not generate movmskps
 and testps instructions  (clang does)
Date: Wed, 17 May 2023 07:40:19 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: vincenzo.innocente at cern dot ch
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109885

            Bug ID: 109885
           Summary: gcc does not generate movmskps and testps instructions
                     (clang does)
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincenzo.innocente at cern dot ch
  Target Milestone: ---

in this simple code (on avx2)

int sum(float const * x) {
   int ret =3D 0;
   for (int i=3D0; i<8; ++i) ret +=3D(0=3D=3Dx[i]);
   return ret;
}

int one(float const * x) {
   int ret =3D 0;
   for (int i=3D0; i<8; ++i) ret |=3D(0=3D=3Dx[i]);
   return ret;
}

int all(float const * x) {
   int ret =3D 1;
   for (int i=3D0; i<8; ++i) ret &=3D(0=3D=3Dx[i]);
   return ret;
}

clang uses movmskps and testps instructions, gcc does not

see for instance

https://godbolt.org/z/r11r8xoYz=