bb := randInt(r, bSize)
	var x, y *Int
	if calcXY {
		x = new(Int)
		y = new(Int)
	}
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		new(Int).GCD(x, y, aa, bb)
	}
}

func BenchmarkGCD10x10(b *testing.B)         { runGCD(b, 10, 10) }
func BenchmarkGCD10x100(b *testing.B)        { runGCD(b, 10, 100) }
func BenchmarkGCD10x1000(b *testing.B)       { runGCD(b, 10, 1000) }