var x204 uint64
	var x205 uint64
	x204, x205 = bits.Add64(x149, x185, uint64(p521Uint1(x203)))
	var x206 uint64
	var x207 uint64
	x206, x207 = bits.Add64(x151, x187, uint64(p521Uint1(x205)))
	var x208 uint64
	var x209 uint64
	x208, x209 = bits.Add64(x153, x189, uint64(p521Uint1(x207)))
	x210 := (uint64(p521Uint1(x209)) + uint64(p521Uint1(x154)))
	var x211 uint64
	var x212 uint64

	return e
}

// Select sets v to a if cond == 1, and to b if cond == 0.
func (v *P521Element) Select(a, b *P521Element, cond int) *P521Element {
	p521Selectznz((*p521UntypedFieldElement)(&v.x), p521Uint1(cond),
		(*p521UntypedFieldElement)(&b.x), (*p521UntypedFieldElement)(&a.x))
	return v
}

func p521InvertEndianness(v []byte) {
	for i := 0; i < len(v)/2; i++ {
		v[i], v[len(v)-1-i] = v[len(v)-1-i], v[i]