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From: "stefansf at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101260] New: Backport 27381e78925 to GCC 11
Date: Tue, 29 Jun 2021 15:35:32 +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=3D101260

            Bug ID: 101260
           Summary: Backport 27381e78925 to GCC 11
           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: s390*-*-*

struct a {
  unsigned b : 7;
  int c;
  int d;
  short e;
} p, *q =3D &p;
int f, g, h, i, r, s;
static short j[8][1][6] =3D {};
char k[7];
short l, m;
int *n;
int **o =3D &n;
void t() {
  for (; f;)
    ;
}
static struct a u(int x) {
  struct a a =3D {4, 8, 5, 4};
  for (; i <=3D 6; i++) {
    struct a v =3D {};
    for (; l; l++)
      h =3D 0;
    for (; h >=3D 0; h--) {
      j[i];
      struct a *w =3D &p;
      s =3D 0;
      for (; s < 3; s++) {
        r ^=3D x;
        m =3D j[i][g][h] =3D=3D (k[g] =3D g);
        *w =3D v;
      }
      r =3D 2;
      for (; r; r--)
        *o =3D &r;
    }
  }
  t();
  return a;
}
int main() {
  *q =3D u(636);
  if (p.b !=3D 4)
    __builtin_abort ();
}

The reduced example runs fine if compiled with mainline (currently 53fd7544=
aff)
whereas it fails if compiled with GCC 11 (currently f6306457ee3). The examp=
le
runs fine with GCC 11, too, if commit d1d01a66012a93cc8cb7dafbe1b5ec453ec96=
b59
is cherry picked. Can we backport this one?=