copy(b.data[n1:], b.tmp[:n3-n2])
		return
	}
	for _, u := range x {
		encodeUint64(b, tag, u)
	}
}

func encodeUint64Opt(b *buffer, tag int, x uint64) {
	if x == 0 {
		return
	}
	encodeUint64(b, tag, x)
}

func encodeInt64(b *buffer, tag int, x int64) {
	u := uint64(x)
	encodeUint64(b, tag, u)
}

func encodeInt64Opt(b *buffer, tag int, x int64) {
	if x == 0 {
		return

		copy(b.data[n1:], b.tmp[:n3-n2])
		return
	}
	for _, u := range x {
		encodeUint64(b, tag, u)
	}
}

func encodeUint64Opt(b *buffer, tag int, x uint64) {
	if x == 0 {
		return
	}
	encodeUint64(b, tag, x)
}

func encodeInt64(b *buffer, tag int, x int64) {
	u := uint64(x)
	encodeUint64(b, tag, u)
}

func encodeInt64s(b *buffer, tag int, x []int64) {
	if len(x) > 2 {
		// Use packed encoding

		func(b *buffer, m message) error { return decodeInt64s(b, &m.(*packedInts).int64s) },
	}
}

func (u *packedInts) encode(b *buffer) {
	encodeUint64s(b, 1, u.uint64s)
	encodeInt64s(b, 2, u.int64s)