var numbers = []int64{
		1, 0, -1,
		2, -2,
		1<<63 - 1, -1 << 63,
	}
	coverage := map[flagConstant]bool{}
	for _, x := range numbers {
		for _, y := range numbers {
			a := addFlags64(x, y)
			b := flagRegister2flagConstant(asmAddFlags(x, y), false)
			if a != b {
				t.Errorf("asmAdd diff: x=%x y=%x got=%s want=%s\n", x, y, a, b)
			}
			coverage[a] = true
		}
	}
	if len(coverage) != 9 { // TODO: can we cover all outputs?