The benchmark code: https://play.golang.org/p/bC1zO14eNeh
The result:
$ go test -bench=.
goos: linux
goarch: amd64
pkg: example.com/valuecopy
cpu: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
Benchmark_CopyBool-4 1000000000 0.8885 ns/op
Benchmark_CopyByte-4 1000000000 0.8872 ns/op
Benchmark_CopyInt16-4 1000000000 0.8785 ns/op
Benchmark_CopyInt32-4 1000000000 0.8854 ns/op
Benchmark_CopyInt64-4 1000000000 0.8831 ns/op
Benchmark_CopyPointer-4 911733464 1.330 ns/op
Benchmark_CopyString-4 901249356 1.325 ns/op
Benchmark_CopySlice-4 664187247 1.765 ns/op
Benchmark_CopyArray_2_elements-4 1000000000 0.8874 ns/op
Benchmark_CopyArray_3_elements-4 1000000000 1.096 ns/op
Benchmark_CopyArray_4_elements-4 1000000000 1.105 ns/op
Benchmark_CopyArray_5_elements-4 534542524 2.202 ns/op
Benchmark_CopyArray_6_elements-4 727849554 1.606 ns/op
Benchmark_CopyArray_7_elements-4 444494692 2.649 ns/op
Benchmark_CopyArray_8_elements-4 584854867 1.993 ns/op
Benchmark_CopyArray_9_elements-4 389639859 3.083 ns/op
Benchmark_CopyArray_10_elements-4 267380602 4.418 ns/op
Benchmark_CopyArray_11_elements-4 242644033 4.867 ns/op
Benchmark_CopyArray_12_elements-4 268304104 4.498 ns/op
Benchmark_CopyArray_13_elements-4 82165272 14.46 ns/op
Benchmark_CopyStruct_2_fields-4 1000000000 0.5029 ns/op
Benchmark_CopyStruct_3_fields-4 671136589 1.769 ns/op
Benchmark_CopyStruct_4_fields-4 1000000000 0.8785 ns/op
Benchmark_CopyStruct_5_fields-4 530876049 2.202 ns/op
Benchmark_CopyStruct_6_fields-4 723380257 1.581 ns/op
Benchmark_CopyStruct_7_fields-4 444619906 2.636 ns/op
Benchmark_CopyStruct_8_fields-4 588605260 1.968 ns/op
Benchmark_CopyStruct_9_fields-4 387253551 3.073 ns/op
Benchmark_CopyStruct_10_fields-4 267450452 4.396 ns/op
Benchmark_CopyStruct_11_fields-4 246289522 4.855 ns/op
Benchmark_CopyStruct_12_fields-4 266212528 4.426 ns/op
Benchmark_CopyStruct_13_fields-4 207298701 5.739 ns/op
>From the benchmark result, it looks
* the cost of copying a [13]int value is much larger than copying a [12]int
value.
* the cost of copying a struct{a, b, c int} value is about double of
copying a struct{a, b, c, d int} value.
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