Pass Go array by value or reference

val_ref_bench.go

package main

import "testing"

type type16 [16]byte

//go:noinline
func val16(v type16) {}

//go:noinline
func ref16(v *type16) {}

type type32 [32]byte

//go:noinline
func val32(v type32) {}

//go:noinline
func ref32(v *type32) {}

type type64 [64]byte

//go:noinline
func val64(v type64) {}

//go:noinline
func ref64(v *type64) {}

type type128 [128]byte

//go:noinline
func val128(v type128) {}

//go:noinline
func ref128(v *type128) {}

//go:noinline
func Benchmark(b *testing.B) {
	var v16 type16
	b.Run("16 by val", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			val16(v16)
		}
	})
	b.Run("16 by ref", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			ref16(&v16)
		}
	})

	var v32 type32
	b.Run("32 by val", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			val32(v32)
		}
	})
	b.Run("32 by ref", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			ref32(&v32)
		}
	})

	var v64 type64
	b.Run("64 by val", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			val64(v64)
		}
	})
	b.Run("64 by ref", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			ref64(&v64)
		}
	})

	var v128 type128
	b.Run("128 by val", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			val128(v128)
		}
	})
	b.Run("128 by ref", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			ref128(&v128)
		}
	})
}