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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102622] [12 Regression] Wrong code with -O3
 for skylake-avx512 and icelake-server
Date: Tue, 05 Oct 2021 22:21:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102622

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Summary|Wrong code with -O3 for     |[12 Regression] Wrong code
                   |skylake-avx512 and          |with -O3 for skylake-avx512
                   |icelake-server              |and icelake-server
   Last reconfirmed|                            |2021-10-05
   Target Milestone|---                         |12.0
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
reduced to one file:
static inline const unsigned &max1(const unsigned &t, const unsigned &t1)
{
    return t > t1 ? t : t1;
}
long long int c =3D 42;
int var_20 =3D 0;
int var_22 =3D 0;
short arr_32 [13];
char arr_45 [69];

void test(int a, unsigned b, long long *c) __attribute__((noipa));
void test(int a, unsigned b, long long *c) {
  for (short d =3D 0; d < 13; d++) {
    for (int e =3D 0; e < a; e +=3D 3)
      var_20 =3D 0;
    if (max1(b, unsigned((short)b))) {
      arr_32[d] =3D 0;
      var_22 =3D *c;
    }
    for (unsigned f =3D 0; f < 69; f +=3D 4)
      arr_45[f] =3D 0;
  }
}
int main() {
    test(-545750584, 1144022456U, &c);
    if (var_22 !=3D 42)
      __builtin_abort();
    return 0;
}

Confirmed.=