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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102627] wrong code with "-O1"
Date: Wed, 06 Oct 2021 10:13:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102627

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Even with plain -O1 I see the wrong 0 result, -O0 and -O2 are fine.  Testca=
se
that aborts:

int a, f, l, m, q, c, d, g;
long b, e;
struct g {
  signed h;
  signed i;
  unsigned j;
  unsigned k;
};
unsigned n;
char o;
int *p =3D &m;
long r(int s) { return s && b ?: b; }
long __attribute__((noipa)) v() {
  l =3D 0 || r(n & o);
  return q;
}
void w(int, unsigned, struct g x) {
  c ?: a;
  for (; d < 2; d++)
    *p =3D x.k;
}
struct g __attribute__((noipa)) y() {
  struct g h =3D {3, 908, 1, 20};
  for (; g; g++)
    ;
  return h;
}
int main() {
  long t;
  struct g u =3D y();
  t =3D e << f;
  w(0, t, u);
  v(0, 4, 4, 4);
  if (m !=3D 20)
    __builtin_abort ();
  return 0;
}=