u.l2) v.l2 ^= t u.l2 ^= t t = m & (v.l3 ^ u.l3) v.l3 ^= t u.l3 ^= t t = m & (v.l4 ^ u.l4) v.l4 ^= t u.l4 ^= t } // IsNegative returns 1 if v is negative, and 0 otherwise. func (v *Element) IsNegative() int { return int(v.Bytes()[0] & 1) } // Absolute sets v to |u|, and returns v. func (v *Element) Absolute(u *Element) *Element { return v.Select(new(Element).Negate(u), u, u.IsNegative()) } // Multiply sets v = x * y, and returns v. func (v *Element) Multiply(x, y *Element) *Element { feMul(v, x, y)...