gcc/testsuite/gcc.dg/switch-4.c

/* PR middle-end/17657 */
/* { dg-do compile } */
/* { dg-options "-O2" } */

extern signed char foo(int);

void bar (void)
{
  signed char tmp = foo (0);
  int t1 = tmp;
  switch (t1)
    {
    case 1: foo (1); break;
    case 2: foo (2); break;
    case 3: foo (3); break;
    case 4: foo (4); break;
    case 5: foo (5); break;
    case 6: foo (6); break;
    case 7: foo (7); break;
    case 255: foo (8); break;
    default: break;
    }
}