}

func biton64(a, b uint64) (n uint64) {
	// amd64:"BTSQ"
	n += b | (1 << (a & 63))

	// amd64:"BTSQ\t[$]63"
	n += a | (1 << 63)

	// amd64:"BTSQ\t[$]60"
	n += a | (1 << 60)

	// amd64:"ORQ\t[$]1"
	n += a | (1 << 0)

	return n
}

func bitoff64(a, b uint64) (n uint64) {
	// amd64:"BTRQ"
	n += b &^ (1 << (a & 63))

	// amd64:"BTRQ\t[$]63"
	n += a &^ (1 << 63)