compare_hack.go

package main

import (
	"fmt"
	"unsafe"
)

type T1 struct {
	d1 int32
	d2 int32
}

type T2 int64

func cmp8bytes(a, b [8]byte) bool {
	for i := 0; i < 8; i++ {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}

func cmp8bytes_s(a, b [8]byte) bool {
	t1 := *(*T1)(unsafe.Pointer(&a))
	t2 := *(*T1)(unsafe.Pointer(&b))

	return t1 == t2
}

func cmp8bytes_ss(a, b [8]byte) bool {
	t1 := *(*T2)(unsafe.Pointer(&a))
	t2 := *(*T2)(unsafe.Pointer(&b))

	return t1 == t2
}

func main() {
	for _, t := range []struct {
		a [8]byte
		b [8]byte
	}{
		{
			[8]byte{1, 2, 3, 4, 5, 6, 7, 8},
			[8]byte{1, 2, 3, 4, 5, 6, 7, 8},
		},
		{
			[8]byte{0, 2, 3, 4, 5, 6, 7, 8},
			[8]byte{1, 2, 3, 4, 5, 6, 7, 8},
		},
	} {
		if cmp8bytes(t.a, t.b) == cmp8bytes_s(t.a, t.b) {
			fmt.Println("cmp8bytes_s works")
		}
		if cmp8bytes(t.a, t.b) == cmp8bytes_ss(t.a, t.b) {
			fmt.Println("cmp8bytes_ss works too!")
		}
	}
}

Live code - https://play.golang.org/p/wkel3QbUgR

Sample output:

cmp8bytes_s works
cmp8bytes_ss works too!
cmp8bytes_s works
cmp8bytes_ss works too!