gcc/gcc/testsuite/gcc.dg/pr78241.c

/* { dg-do run } */
/* { dg-options "-Og -funroll-loops" } */

static __attribute__((noinline, noclone)) unsigned
foo (unsigned x)
{
  do
    x++;
  while (x <= 15);
  return x;
}

int main ()
{
  unsigned x = foo (-2);
  if (x != (unsigned)-1)
    __builtin_abort();
  return 0;
}