The following example fails when it is compiled with

-m68hc12 -O -fomit-frame-pointer -mshort

The generated code is wrong because the shift count
loaded by 'shl' is loaded at an invalid stack offset.
This example works with gcc 3.0.4 but fails with gcc 3.3.

typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned long uint32_t;

uint32_t test;

void shl(uint8_t Nr)
{
    test |= (1L<<Nr);
}

int main(void)
{
  test = 1;
  shl(2);
  if (test != 5L)
     return 1;
  shl(17);
  if (test != (5L | (1L << 17)))
     return 1;
  return 0;
}