[Bug rtl-optimization/80501] [6/7/8 Regression] Wrong code w/ a signed char, a shift, and a conversion to int

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80501

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Adjusted testcase for the testsuite:

signed char v = 0;

static signed char
foo (int x, int y)
{
  return x << y;
}

__attribute__((noinline, noclone)) int
bar (void)
{
  return foo (v >= 0, __CHAR_BIT__ - 1) >= 1;
}

int
main ()
{
  if (sizeof (int) > sizeof (char) && bar () != 0)
    __builtin_abort ();
  return 0;
}