path: root/pow/ar/ops.go

package ar

import "math/big"

const lenops int64 = 9

type OpsFunc func(a, b *big.Int) *big.Int

var ops [lenops]OpsFunc

func init() {
    ops[0] = Add
    ops[1] = Mul
    ops[2] = Mod
    ops[3] = Xor
    ops[4] = And
    ops[5] = Or
    ops[6] = Sub1
    ops[7] = XorSub
    ops[8] = Rsh
}

func Add(x, y *big.Int) *big.Int {
    return new(big.Int).Add(x, y)
}
func Mul(x, y *big.Int) *big.Int {
    return new(big.Int).Mul(x, y)
}
func Mod(x, y *big.Int) *big.Int {
    return new(big.Int).Mod(x, y)
}
func Xor(x, y *big.Int) *big.Int {
    return new(big.Int).Xor(x, y)
}
func And(x, y *big.Int) *big.Int {
    return new(big.Int).And(x, y)
}
func Or(x, y *big.Int) *big.Int {
    return new(big.Int).Or(x, y)
}
func Sub1(x, y *big.Int) *big.Int {
    a := big.NewInt(-1)
    a.Sub(a, x)

    return a
}
func XorSub(x, y *big.Int) *big.Int {
    t := Sub1(x, nil)

    return t.Xor(t, y)
}
func Rsh(x, y *big.Int) *big.Int {
    return new(big.Int).Rsh(x, uint(y.Uint64()%64))
}