if targetProg == nil {
			p.errorf("undefined label %s", patch.label)
			return
		}
		p.branch(patch.addr, targetProg)
	}
	p.toPatch = p.toPatch[:0]
}

func (p *Parser) branch(addr *obj.Addr, target *obj.Prog) {
	*addr = obj.Addr{
		Type:  obj.TYPE_BRANCH,
		Index: 0,
	}
	addr.Val = target
}

// asmInstruction assembles an instruction.
// MOVW R9, (R10)