performance change

encode_interface.go

func (f fieldEncoder) Encode(bag attribute.Bag, ba []byte, noInterfaceFieldEncode bool) ([]byte, error) {
	ba = append(ba, f.protoKey...)

	for i := 0; i < len(f.encoder); i++ {
		var err error
		if !noInterfaceFieldEncode {
			ba, err = f.encoder[i].Encode(bag, ba)
			if err != nil {
				return nil, err
			}
			continue
		}
		switch enc := f.encoder[i].(type) {
		case *staticEncoder:
			ba = append(ba, enc.encodedData...)
		case messageEncoder:
			ba, err = enc.Encode(bag, ba)
		case *eEnumEncoder:
			ba, err = enc.Encode(bag, ba)
		case *primEvalEncoder:
			ba, err = enc.Encode(bag, ba)
		default:
			fmt.Printf("%T: %v, %v", enc, f, enc)
			ba, err = enc.Encode(bag, ba)
		}

		if err != nil {
			return nil, err
		}

	}

	return ba, nil
}

/// -----------------

func benchmarkDynamic(b *testing.B) {
  var err error
	b.StopTimer()
	enc := getEncoder()
  // pre-allocate slice ... same for Gogo benchmarks
  ba := make([]byte, 0, 1000)
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		ba = ba[0:0]
		ba, err = enc.Encode(nil, ba)
		if err != nil {
			b.Fatalf("failed")
		}
	}
}