}

func sh16(n int16) int16 {
	if n < 0 {
		return n
	}
	return n >> 15 // ERROR "Proved Rsh16x64 shifts to zero"
}

func sh64noopt(n int64) int64 {
	return n >> 63 // not optimized; n could be negative
}

// These cases are division of a positive signed integer by a power of 2.