unsafe_pointer_vs_explicit_conversion.go

package tt;
import (
	"strings"
	"testing"
	"unsafe"
)

func BenchmarkUnsafePointerVSExplicitlyConvert(b *testing.B) {
	s := strings.Repeat("a", 1000)
	bytes := []byte(s)
	b.Run("str-to-bytes", func(b *testing.B) {
		b.Run("unsafe", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				_ = *(*[]byte)(unsafe.Pointer(&s))
			}
		})
		b.Run("normal", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				_ = []byte(s)
			}
		})
	})
	b.Run("bytes-to-str", func(b *testing.B) {
		b.Run("unsafe", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				_ = *(*string)(unsafe.Pointer(&bytes))
			}
		})
		b.Run("string", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				_ = string(bytes)
			}
		})
	})
}

BenchmarkUnsafePointerVSExplicitlyConvert/str-to-bytes/unsafe-8         1000000000               0.288 ns/op           0 B/op          0 allocs/op
BenchmarkUnsafePointerVSExplicitlyConvert/str-to-bytes/normal-8          4243749               275 ns/op            1024 B/op          1 allocs/op
BenchmarkUnsafePointerVSExplicitlyConvert/bytes-to-str/unsafe-8         1000000000               0.274 ns/op           0 B/op          0 allocs/op
BenchmarkUnsafePointerVSExplicitlyConvert/bytes-to-str/string-8          4301948               278 ns/op            1024 B/op          1 allocs/op