switch name {
	case "F":
		if 0 <= n && n <= 31 {
			return loong64.REG_F0 + n, true
		}
	case "FCSR":
		if 0 <= n && n <= 31 {
			return loong64.REG_FCSR0 + n, true
		}
	case "FCC":
		if 0 <= n && n <= 31 {
			return loong64.REG_FCC0 + n, true
		}
	case "R":
		if 0 <= n && n <= 31 {
			return loong64.REG_R0 + n, true
		}
	}
	return 0, false

	register["PC"] = RPC
	// Avoid unintentionally clobbering g using R22.
	delete(register, "R22")
	register["g"] = loong64.REG_R22
	registerPrefix := map[string]bool{
		"F":    true,
		"FCSR": true,
		"FCC":  true,
		"R":    true,
	}

	instructions := make(map[string]obj.As)
	for i, s := range obj.Anames {
		instructions[s] = obj.As(i)
	}
	for i, s := range loong64.Anames {