if paramResultInfo.InRegistersUsed()+paramResultInfo.OutRegistersUsed() > 0 {
		reg = &regInfo{}
	}
	return &AuxCall{Fn: sym, abiInfo: paramResultInfo, reg: reg}
}

// InterfaceAuxCall returns an AuxCall for an interface call.
func InterfaceAuxCall(paramResultInfo *abi.ABIParamResultInfo) *AuxCall {
	var reg *regInfo
	if paramResultInfo.InRegistersUsed()+paramResultInfo.OutRegistersUsed() > 0 {
		reg = &regInfo{}
	}

					// rewrite the mem selector in place
					call := v.Args[0]
					aux := call.Aux.(*AuxCall)
					mem := x.memForCall[call.ID]
					if mem == nil {
						v.AuxInt = int64(aux.abiInfo.OutRegistersUsed())
						x.memForCall[call.ID] = v
					} else {
						panic(fmt.Errorf("Saw two memories for call %v, %v and %v", call, mem, v))
					}
				} else {
					selects = append(selects, v)
				}