}

func BenchmarkBitClear(b *testing.B) {
	const N = 64 * 8
	a := make([]uint64, N/64)
	for i := 0; i < b.N; i++ {
		for j := uint64(0); j < N; j++ {
			a[j/64] &^= 1 << (j % 64)
		}
	}
}

func BenchmarkBitToggle(b *testing.B) {
	const N = 64 * 8
	a := make([]uint64, N/64)
	for i := 0; i < b.N; i++ {
		for j := uint64(0); j < N; j++ {
			a[j/64] ^= 1 << (j % 64)
		}
	}
}