default:
			c.ctxt.Diag("unexpected opcode %v", p.As)
		case AMVC:
			opcode = op_MVC
		case AMVCIN:
			opcode = op_MVCIN
		case ACLC:
			opcode = op_CLC
			// swap operand order for CLC so that it matches CMP
			b1, b2 = b2, b1
			d1, d2 = d2, d1
		case AXC:
			opcode = op_XC
		case AOC:
			opcode = op_OC
		case ANC:
			opcode = op_NC
		}