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From: "kristerw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110495] New: fre introduces signed wrap for
 vector
Date: Fri, 30 Jun 2023 09:06:41 +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=3D110495

            Bug ID: 110495
           Summary: fre introduces signed wrap for vector
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kristerw at gcc dot gnu.org
  Target Milestone: ---

The following function (from gcc.dg/tree-ssa/addadd-2.c)

typedef int S __attribute__((vector_size(64)));
void j(S*x){
  *x +=3D __INT_MAX__;
  *x +=3D __INT_MAX__;
}

is optimized by fre1 to=20

void j (S * x)
{
  vector(16) int _1;
  vector(16) int _2;
  vector(16) int _4;

  <bb 2> :
  _1 =3D *x_6(D);
  _2 =3D _1 + { 2147483647, 2147483647, 2147483647, 2147483647, 2147483647,
2147483647, 2147483647, 2147483647, 2147483647, 2147483647, 2147483647,
2147483647, 2147483647, 2147483647, 2147483647, 2147483647 };
  *x_6(D) =3D _2;
  _4 =3D _1 + { -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OV=
F),
-2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(OVF), -2(=
OVF)
};
  *x_6(D) =3D _4;
  return;
}

which has signed wrap for the cases where the original did not wrap.=