// polyAdd adds two ringElements or nttElements.
func polyAdd[T ~[n]fieldElement](a, b T) (s T) {
	for i := range s {
		s[i] = fieldAdd(a[i], b[i])
	}
	return s
}

// polySub subtracts two ringElements or nttElements.
func polySub[T ~[n]fieldElement](a, b T) (s T) {
	for i := range s {
		s[i] = fieldSub(a[i], b[i])
	}
	return s
}

// polyByteEncode appends the 384-byte encoding of f to b.
//

sealAVX2Tail128LoopA:
	polyAdd(0(oup))
	polyMul
	LEAQ 16(oup), oup

sealAVX2Tail128LoopB:
	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
	polyAdd(0(oup))
	polyMul
	VPALIGNR $4, BB0, BB0, BB0
	VPALIGNR $8, CC0, CC0, CC0
	VPALIGNR $12, DD0, DD0, DD0
	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
	polyAdd(16(oup))
	polyMul
	LEAQ     32(oup), oup
	VPALIGNR $12, BB0, BB0, BB0