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bitwise_test.go
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bitwise_test.go
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package uint256
import "testing"
type logicOpTest struct {
name string
x Uint
y Uint
want Uint
}
func TestOr(t *testing.T) {
tests := []logicOpTest{
{
name: "all zeros",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "mixed",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
y: Uint{arr: [4]uint64{0, 0, ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "one operand all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := new(Uint).Or(&tt.x, &tt.y)
if *res != tt.want {
t.Errorf("Or(%s, %s) = %s, want %s", tt.x.ToString(), tt.y.ToString(), res.ToString(), (tt.want).ToString())
}
})
}
}
func TestAnd(t *testing.T) {
tests := []logicOpTest{
{
name: "all zeros",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "mixed",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed 2",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed 3",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
y: Uint{arr: [4]uint64{0, 0, ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "one operand zero",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "one operand all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000}},
want: Uint{arr: [4]uint64{0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000}},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := new(Uint).And(&tt.x, &tt.y)
if *res != tt.want {
t.Errorf("And(%s, %s) = %s, want %s", tt.x.ToString(), tt.y.ToString(), res.ToString(), (tt.want).ToString())
}
})
}
}
func TestNot(t *testing.T) {
tests := []struct {
name string
x Uint
want Uint
}{
{
name: "all zeros",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
want: Uint{arr: [4]uint64{0, 0, ^uint64(0), ^uint64(0)}},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := new(Uint).Not(&tt.x)
if *res != tt.want {
t.Errorf("Not(%s) = %s, want %s", tt.x.ToString(), res.ToString(), (tt.want).ToString())
}
})
}
}
func TestAndNot(t *testing.T) {
tests := []logicOpTest{
{
name: "all zeros",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed 2",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "mixed 3",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
y: Uint{arr: [4]uint64{0, 0, ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
},
{
name: "one operand zero",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "one operand all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000}},
want: Uint{arr: [4]uint64{0xAAAAAAAAAAAAAAAA, 0x5555555555555555, 0x0000000000000000, ^uint64(0)}},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := new(Uint).AndNot(&tt.x, &tt.y)
if *res != tt.want {
t.Errorf("AndNot(%s, %s) = %s, want %s", tt.x.ToString(), tt.y.ToString(), res.ToString(), (tt.want).ToString())
}
})
}
}
func TestXor(t *testing.T) {
tests := []logicOpTest{
{
name: "all zeros",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{0, 0, 0, 0}},
},
{
name: "mixed",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "mixed 2",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0, 0, 0, 0}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "mixed 3",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), 0, 0}},
y: Uint{arr: [4]uint64{0, 0, ^uint64(0), ^uint64(0)}},
want: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
},
{
name: "one operand zero",
x: Uint{arr: [4]uint64{0, 0, 0, 0}},
y: Uint{arr: [4]uint64{0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF}},
want: Uint{arr: [4]uint64{0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF}},
},
{
name: "one operand all ones",
x: Uint{arr: [4]uint64{^uint64(0), ^uint64(0), ^uint64(0), ^uint64(0)}},
y: Uint{arr: [4]uint64{0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000}},
want: Uint{arr: [4]uint64{0xAAAAAAAAAAAAAAAA, 0x5555555555555555, 0x0000000000000000, ^uint64(0)}},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := new(Uint).Xor(&tt.x, &tt.y)
if *res != tt.want {
t.Errorf("Xor(%s, %s) = %s, want %s", tt.x.ToString(), tt.y.ToString(), res.ToString(), (tt.want).ToString())
}
})
}
}
func TestLsh(t *testing.T) {
tests := []struct {
x string
y uint
want string
}{
{"0", 0, "0"},
{"0", 1, "0"},
{"0", 64, "0"},
{"1", 0, "1"},
{"1", 1, "2"},
{"1", 64, "18446744073709551616"},
{"1", 128, "340282366920938463463374607431768211456"},
{"1", 192, "6277101735386680763835789423207666416102355444464034512896"},
{"1", 255, "57896044618658097711785492504343953926634992332820282019728792003956564819968"},
{"1", 256, "0"},
{"31337", 0, "31337"},
{"31337", 1, "62674"},
{"31337", 64, "578065619037836218990592"},
{"31337", 128, "10663428532201448629551770073089320442396672"},
{"31337", 192, "196705537081812415096322133155058642481399512563169449530621952"},
{"31337", 193, "393411074163624830192644266310117284962799025126338899061243904"},
{"31337", 255, "57896044618658097711785492504343953926634992332820282019728792003956564819968"},
{"31337", 256, "0"},
// 64 < n < 128
{"1", 65, "36893488147419103232"},
{"31337", 100, "39724366859352024754702188346867712"},
// 128 < n < 192
{"1", 129, "680564733841876926926749214863536422912"},
{"31337", 150, "44725660946326664792723507424638829088826130956288"},
// 192 < n < 256
{"1", 193, "12554203470773361527671578846415332832204710888928069025792"},
{"31337", 200, "50356617492943978264658466087695012475238275216171379079839219712"},
// n > 256
{"1", 257, "0"},
{"31337", 300, "0"},
}
for _, tt := range tests {
x := MustFromDecimal(tt.x)
want := MustFromDecimal(tt.want)
got := new(Uint).Lsh(x, tt.y)
if got.Neq(want) {
t.Errorf("Lsh(%s, %d) = %s, want %s", tt.x, tt.y, got.ToString(), want.ToString())
}
}
}
func TestRsh(t *testing.T) {
tests := []struct {
x string
y uint
want string
}{
{"0", 0, "0"},
{"0", 1, "0"},
{"0", 64, "0"},
{"1", 0, "1"},
{"1", 1, "0"},
{"1", 64, "0"},
{"1", 128, "0"},
{"1", 192, "0"},
{"1", 255, "0"},
{"57896044618658097711785492504343953926634992332820282019728792003956564819968", 255, "1"},
{"6277101735386680763835789423207666416102355444464034512896", 192, "1"},
{"340282366920938463463374607431768211456", 128, "1"},
{"18446744073709551616", 64, "1"},
{"393411074163624830192644266310117284962799025126338899061243904", 193, "31337"},
{"196705537081812415096322133155058642481399512563169449530621952", 192, "31337"},
{"10663428532201448629551770073089320442396672", 128, "31337"},
{"578065619037836218990592", 64, "31337"},
{twoPow256Sub1, 256, "0"},
// outliers
{"340282366920938463463374607431768211455", 129, "0"},
{"18446744073709551615", 65, "0"},
{twoPow256Sub1, 1, "57896044618658097711785492504343953926634992332820282019728792003956564819967"},
// n > 256
{"1", 257, "0"},
{"31337", 300, "0"},
}
for _, tt := range tests {
x := MustFromDecimal(tt.x)
want := MustFromDecimal(tt.want)
got := new(Uint).Rsh(x, tt.y)
if got.Neq(want) {
t.Errorf("Rsh(%s, %d) = %s, want %s", tt.x, tt.y, got.ToString(), want.ToString())
}
}
}
func TestSRsh(t *testing.T) {
tests := []struct {
x string
y uint
want string
}{
// Positive numbers (behaves like Rsh)
{"0x0", 0, "0x0"},
{"0x0", 1, "0x0"},
{"0x1", 0, "0x1"},
{"0x1", 1, "0x0"},
{"0x31337", 0, "0x31337"},
{"0x31337", 4, "0x3133"},
{"0x31337", 8, "0x313"},
{"0x31337", 16, "0x3"},
{"0x10000000000000000", 64, "0x1"}, // 2^64 >> 64
// // Numbers with MSB set (negative numbers in two's complement)
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 1, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 4, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 64, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 128, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 192, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 255, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
// Large positive number close to max value
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 1, "0x3fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 2, "0x1fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 64, "0x7fffffffffffffffffffffffffffffffffffffffffffffff"},
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 128, "0x7fffffffffffffffffffffffffffffff"},
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 192, "0x7fffffffffffffff"},
{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 255, "0x0"},
// Specific cases
{"0x8000000000000000000000000000000000000000000000000000000000000000", 1, "0xc000000000000000000000000000000000000000000000000000000000000000"},
{"0x8000000000000000000000000000000000000000000000000000000000000001", 1, "0xc000000000000000000000000000000000000000000000000000000000000000"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 65, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 127, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 129, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 193, "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
// n > 256
{"0x1", 257, "0x0"},
{"0x31337", 300, "0x0"},
}
for _, tt := range tests {
x := MustFromHex(tt.x)
want := MustFromHex(tt.want)
got := new(Uint).SRsh(x, tt.y)
if !got.Eq(want) {
t.Errorf("SRsh(%s, %d) = %s, want %s", tt.x, tt.y, got.ToString(), want.ToString())
}
}
}