[Bug c/106892] [11/12/13 Regression] Wrong code at -O3 on x86_64-linux-gnu since r11-963-g80d6f89e78fc3b77

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106892

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the inline just has the return undefined in the unreachable path.  We can
make the inlined functions static (cleans up post-IPA dumps) and disable IPA
for j:

int a, b, c, d, e;
int f[8];
static int g() {
  while (a)
    a >>= 4;
  return 0;
}
static int h(int i) {
  if (i >= '0')
    return i - '0';
  //__builtin_unreachable ();
}
void __attribute__((noipa)) j(int i) {
  for (b = 2; g() <= 7; b++)
    if (i) {
      for (; e <= 7; e++)
        for (c = 1; c <= 7; c++) {
          d = h(b + '0');
          f[-d + 4] ^= 3;
        }
      return;
    }
}
int main() {
  j(1);
  if (f[2] != 0)
    __builtin_abort ();
}