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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102511] [12 Regression] GCC produces
 incorrect code for -O3: first element of the array is skipped
Date: Tue, 28 Sep 2021 04:37:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102511

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is one which aborts and shows the issue:
char arr_15 [8];
__attribute__((noipa))
void test(signed char a, unsigned short b, unsigned long long c,
          unsigned short f) {
  for (int d =3D b - 8; d < b; d +=3D 2)
    for (short e =3D 0; e < (unsigned short)((f ? 122 : 0) ^ (a ? c : 0)) -
64055;
         e +=3D 3)
      arr_15[d] =3D 42;
}
int main() {
    test(37, 8, 12325048486467861044ULL, 45936);
    for (int i =3D 0; i < 8; ++i)
      {
        if (arr_15[i] !=3D ((i&1) ? 0 : 42))
          __builtin_abort();
      }
  return 0;
}=