Function opcodeSub

txscript/opcode.go:1554–1567

opcodeSub treats the top two items on the data stack as integers and replaces them with the result of subtracting the top entry from the second-to-top entry. Stack transformation: [... x1 x2] -> [... x1-x2]

(op *opcode, data []byte, vm *Engine)

//
// Stack transformation: [... x1 x2] -> [... x1-x2]
func opcodeSub(op *opcode, data []byte, vm *Engine) error {
	v0, err := vm.dstack.PopInt()
	if err != nil {
		return err
	}

	v1, err := vm.dstack.PopInt()
	if err != nil {
		return err
	}

	vm.dstack.PushInt(v1 - v0)
	return nil
}

// opcodeBoolAnd treats the top two items on the data stack as integers.  When
// both of them are not zero, they are replaced with a 1, otherwise a 0.