func BenchmarkExtShift(b *testing.B) {
	x := make([]int32, 1024)
	for i := 0; i < b.N; i++ {
		var s int64
		for i := range x {
			s ^= int64(x[i]+32) * 8
		}
		globl = s
	}
}

func BenchmarkModify(b *testing.B) {
	a := make([]int64, 1024)
	v := globl
	for i := 0; i < b.N; i++ {
		for j := range a {
			a[j] += v
		}
	}
}

func BenchmarkMullImm(b *testing.B) {
	x := make([]int32, 1024)