return false
	}
	// Doesn't work for 0.
	// Don't use it for powers of 2.
	return c&(c-1) != 0
}

func sdivisibleOK8(c int8) bool   { return sdivisibleOK(8, int64(c)) }
func sdivisibleOK16(c int16) bool { return sdivisibleOK(16, int64(c)) }
func sdivisibleOK32(c int32) bool { return sdivisibleOK(32, int64(c)) }
func sdivisibleOK64(c int64) bool { return sdivisibleOK(64, c) }

type sdivisibleData struct {