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From: "stefansf at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/99253] New: tree-vect-loop wrong code
Date: Wed, 24 Feb 2021 17:02:01 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99253

            Bug ID: 99253
           Summary: tree-vect-loop wrong code
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stefansf at linux dot ibm.com
  Target Milestone: ---
            Target: s390x, x86_64-*-*

int a =3D 0;
static int b =3D 0;
long c =3D 0;

int
main() {
  for (int d =3D 0; d < 8; d++) {
    a ^=3D c;
    b =3D a;
    a ^=3D 1;
  }
  if (b !=3D 1)
    __builtin_abort();
  return 0;
}

Aborts when built with:
gcc -O3 t.c

Bisection stops at commit 04bff1bbfc11a974342c0eb0c0d65d902e36e82e on IBM Z=
 and
at commit b7ff7cef5005721e78d6936bed3ae1c059b4e8d2 on x86 =C2=AF\_(=E3=83=
=84)_/=C2=AF=