Example #1
0
func BenchmarkHasFactorBigIntRnd_128b(b *testing.B) {
	const N = 1 << 16
	b.StopTimer()
	type t struct {
		d *big.Int
		e uint32
	}
	a := make([]t, N)
	r, err := mathutil.NewFCBig(_1, New(128), true)
	if err != nil {
		b.Fatal(err)
	}
	r2 := r32()
	for i := range a {
		dd := r.Next()
		a[i] = t{
			dd.SetBit(dd, 0, 1),
			uint32(r2.Next()),
		}
	}
	once358.Do(func() { b.Log("Random 128 bit factor, random 32 bit exponent\n") })
	runtime.GC()
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		v := a[i&(N-1)]
		HasFactorBigInt(v.d, v.e)
	}
}
Example #2
0
func r64() *mathutil.FCBig {
	r, err := mathutil.NewFCBig(r64lo, r64hi, true)
	if err != nil {
		panic(err)
	}

	return r
}
Example #3
0
func TestMod(t *testing.T) {
	const N = 1e4
	data := []struct {
		mod, n int64
		exp    uint32
	}{
		{0, 0x00, 3},
		{1, 0x01, 3},
		{3, 0x03, 3},
		{0, 0x07, 3},
		{1, 0x0f, 3},
		{3, 0x1f, 3},
		{0, 0x3f, 3},
		{1, 0x7f, 3},
		{3, 0xff, 3},
		{0, 0x1ff, 3},
	}

	var mod, n big.Int
	for _, v := range data {
		n.SetInt64(v.n)
		p := Mod(&mod, &n, v.exp)
		if p != &mod {
			t.Fatal(p)
		}

		if g, e := mod.Int64(), v.mod; g != e {
			t.Fatal(v.n, v.exp, g, e)
		}
	}

	f := func(in int64, exp uint32) {
		n.SetInt64(in)
		mod.Mod(&n, New(exp))
		e := mod.Int64()
		Mod(&mod, &n, exp)
		g := mod.Int64()
		if g != e {
			t.Fatal(in, exp, g, e)
		}
	}

	r32, _ := mathutil.NewFC32(1, 1e6, true)
	r64, _ := mathutil.NewFCBig(_0, big.NewInt(math.MaxInt64), true)
	for i := 0; i < N; i++ {
		f(r64.Next().Int64(), uint32(r32.Next()))
	}
}