package goapk

import "math/big"

func signExtend(n *big.Int, size int) {
	bitPos := size - 7
	max := size
	if bitPos < 0 {
		bitPos = 0
		max = 7
	}
	for ; bitPos < max; bitPos++ {
		n.SetBit(n, bitPos, 1)
	}
}