bench.txt

go test -bench . -benchmem
BenchmarkOk-4           2000000000               0.32 ns/op            0 B/op          0 allocs/op
BenchmarkErr-4          2000000000               0.32 ns/op            0 B/op          0 allocs/op

go tool compile -S hoge_test.go

"".BenchmarkOk t=1 size=35 args=0x8 locals=0x0
        0x0000 00000 (a_test.go:8)      TEXT    "".BenchmarkOk(SB), $0-8
        0x0000 00000 (a_test.go:8)      FUNCDATA        $0, gclocals·a36216b97439c93dafebe03e7f0808b5(SB)
        0x0000 00000 (a_test.go:8)      FUNCDATA        $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (a_test.go:10)     MOVQ    "".b+8(FP), AX
        0x0005 00005 (a_test.go:9)      MOVQ    $0, CX
        0x0007 00007 (a_test.go:10)     MOVQ    200(AX), DX
        0x000e 00014 (a_test.go:10)     CMPQ    CX, DX
        0x0011 00017 (a_test.go:10)     JGE     $0, 34
        0x0013 00019 (a_test.go:10)     INCQ    CX
        0x0016 00022 (a_test.go:10)     MOVQ    200(AX), DX
        0x001d 00029 (a_test.go:10)     CMPQ    CX, DX
        0x0020 00032 (a_test.go:10)     JLT     $0, 19
        0x0022 00034 (a_test.go:16)     RET
        0x0000 48 8b 44 24 08 31 c9 48 8b 90 c8 00 00 00 48 39  H.D$.1.H......H9
        0x0010 d1 7d 0f 48 ff c1 48 8b 90 c8 00 00 00 48 39 d1  .}.H..H......H9.
        0x0020 7c f1 c3                                         |..
"".BenchmarkErr t=1 size=35 args=0x8 locals=0x0
        0x0000 00000 (a_test.go:17)     TEXT    "".BenchmarkErr(SB), $0-8
        0x0000 00000 (a_test.go:17)     FUNCDATA        $0, gclocals·a36216b97439c93dafebe03e7f0808b5(SB)
        0x0000 00000 (a_test.go:17)     FUNCDATA        $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (a_test.go:19)     MOVQ    "".b+8(FP), AX
        0x0005 00005 (a_test.go:18)     MOVQ    $0, CX
        0x0007 00007 (a_test.go:19)     MOVQ    200(AX), DX
        0x000e 00014 (a_test.go:19)     CMPQ    CX, DX
        0x0011 00017 (a_test.go:19)     JGE     $0, 34
        0x0013 00019 (a_test.go:19)     INCQ    CX
        0x0016 00022 (a_test.go:19)     MOVQ    200(AX), DX
        0x001d 00029 (a_test.go:19)     CMPQ    CX, DX
        0x0020 00032 (a_test.go:19)     JLT     $0, 19
        0x0022 00034 (a_test.go:25)     RET
        0x0000 48 8b 44 24 08 31 c9 48 8b 90 c8 00 00 00 48 39  H.D$.1.H......H9
        0x0010 d1 7d 0f 48 ff c1 48 8b 90 c8 00 00 00 48 39 d1  .}.H..H......H9.
        0x0020 7c f1 c3

hoge_test.go

package main

import (
	"errors"
	"testing"
)

func BenchmarkOk(b *testing.B) {
	var j int
	for i := 0; i < b.N; i++ {
		ok, _ := test()
		if !ok {
			j++ // なんか処理をいれたかっただけ
		}
	}
}
func BenchmarkErr(b *testing.B) {
	var j int
	for i := 0; i < b.N; i++ {
		_, err := test()
		if err != nil {
			j++ // なんか処理をいれたかっただけ
		}
	}
}

var (
	ErrorTest = errors.New("test")
)

func test() (ok bool, err error) {
	return false, ErrorTest
}