prog := &obj.Prog{
		Ctxt: p.ctxt,
		As:   obj.APCDATA,
		Pos:  p.pos(),
		From: key,
		To:   value,
	}
	p.append(prog, "", true)
}

// asmPCAlign assembles a PCALIGN pseudo-op.
// PCALIGN $16
func (p *Parser) asmPCAlign(operands [][]lex.Token) {
	if len(operands) != 1 {
		p.errorf("expect one operand for PCALIGN")
		return
	}

	// Operand 0 must be an immediate constant.

	switch word {
	case "DATA":
		p.asmData(operands)
	case "FUNCDATA":
		p.asmFuncData(operands)
	case "GLOBL":
		p.asmGlobl(operands)
	case "PCDATA":
		p.asmPCData(operands)
	case "PCALIGN":
		p.asmPCAlign(operands)
	case "TEXT":
		p.asmText(operands)
	default:
		return false
	}
	return true
}

// symDefRef scans a line for potential text symbol definitions and