// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package big
import (
"fmt"
"internal/testenv"
"math/rand"
"strings"
"testing"
)
var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")
type funVV func(z, x, y []Word) (c Word)
type argVV struct {
z, x, y nat
c Word
}
var sumVV = []argVV{
{},
{nat{0}, nat{0}, nat{0}, 0},
{nat{1}, nat{1}, nat{0}, 0},
{nat{0}, nat{_M}, nat{1}, 1},
{nat{80235}, nat{12345}, nat{67890}, 0},
{nat{_M - 1}, nat{_M}, nat{_M}, 1},
{nat{0, 0, 0, 0}, nat{_M, _M, _M, _M}, nat{1, 0, 0, 0}, 1},
{nat{0, 0, 0, _M}, nat{_M, _M, _M, _M - 1}, nat{1, 0, 0, 0}, 0},
{nat{0, 0, 0, 0}, nat{_M, 0, _M, 0}, nat{1, _M, 0, _M}, 1},
}
func testFunVV(t *testing.T, msg string, f funVV, a argVV) {
z := make(nat, len(a.z))
c := f(z, a.x, a.y)
for i, zi := range z {
if zi != a.z[i] {
t.Errorf("%s%+v\n\tgot z[%d] = %#x; want %#x", msg, a, i, zi, a.z[i])
break
}
}
if c != a.c {
t.Errorf("%s%+v\n\tgot c = %#x; want %#x", msg, a, c, a.c)
}
}
func TestFunVV(t *testing.T) {
for _, a := range sumVV {
arg := a
testFunVV(t, "addVV_g", addVV_g, arg)
testFunVV(t, "addVV", addVV, arg)
arg = argVV{a.z, a.y, a.x, a.c}
testFunVV(t, "addVV_g symmetric", addVV_g, arg)
testFunVV(t, "addVV symmetric", addVV, arg)
arg = argVV{a.x, a.z, a.y, a.c}
testFunVV(t, "subVV_g", subVV_g, arg)
testFunVV(t, "subVV", subVV, arg)
arg = argVV{a.y, a.z, a.x, a.c}
testFunVV(t, "subVV_g symmetric", subVV_g, arg)
testFunVV(t, "subVV symmetric", subVV, arg)
}
}
// Always the same seed for reproducible results.
var rnd = rand.New(rand.NewSource(0))
func rndW() Word {
return Word(rnd.Int63()<<1 | rnd.Int63n(2))
}
func rndV(n int) []Word {
v := make([]Word, n)
for i := range v {
v[i] = rndW()
}
return v
}
var benchSizes = []int{1, 2, 3, 4, 5, 1e1, 1e2, 1e3, 1e4, 1e5}
func BenchmarkAddVV(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
x := rndV(n)
y := rndV(n)
z := make([]Word, n)
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _W))
for i := 0; i < b.N; i++ {
addVV(z, x, y)
}
})
}
}
func BenchmarkSubVV(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
x := rndV(n)
y := rndV(n)
z := make([]Word, n)
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _W))
for i := 0; i < b.N; i++ {
subVV(z, x, y)
}
})
}
}
type funVW func(z, x []Word, y Word) (c Word)
type argVW struct {
z, x nat
y Word
c Word
}
var sumVW = []argVW{
{},
{nil, nil, 2, 2},
{nat{0}, nat{0}, 0, 0},
{nat{1}, nat{0}, 1, 0},
{nat{1}, nat{1}, 0, 0},
{nat{0}, nat{_M}, 1, 1},
{nat{0, 0, 0, 0}, nat{_M, _M, _M, _M}, 1, 1},
{nat{585}, nat{314}, 271, 0},
}
var lshVW = []argVW{
{},
{nat{0}, nat{0}, 0, 0},
{nat{0}, nat{0}, 1, 0},
{nat{0}, nat{0}, 20, 0},
{nat{_M}, nat{_M}, 0, 0},
{nat{_M << 1 & _M}, nat{_M}, 1, 1},
{nat{_M << 20 & _M}, nat{_M}, 20, _M >> (_W - 20)},
{nat{_M, _M, _M}, nat{_M, _M, _M}, 0, 0},
{nat{_M << 1 & _M, _M, _M}, nat{_M, _M, _M}, 1, 1},
{nat{_M << 20 & _M, _M, _M}, nat{_M, _M, _M}, 20, _M >> (_W - 20)},
}
var rshVW = []argVW{
{},
{nat{0}, nat{0}, 0, 0},
{nat{0}, nat{0}, 1, 0},
{nat{0}, nat{0}, 20, 0},
{nat{_M}, nat{_M}, 0, 0},
{nat{_M >> 1}, nat{_M}, 1, _M << (_W - 1) & _M},
{nat{_M >> 20}, nat{_M}, 20, _M << (_W - 20) & _M},
{nat{_M, _M, _M}, nat{_M, _M, _M}, 0, 0},
{nat{_M, _M, _M >> 1}, nat{_M, _M, _M}, 1, _M << (_W - 1) & _M},
{nat{_M, _M, _M >> 20}, nat{_M, _M, _M}, 20, _M << (_W - 20) & _M},
}
func testFunVW(t *testing.T, msg string, f funVW, a argVW) {
z := make(nat, len(a.z))
c := f(z, a.x, a.y)
for i, zi := range z {
if zi != a.z[i] {
t.Errorf("%s%+v\n\tgot z[%d] = %#x; want %#x", msg, a, i, zi, a.z[i])
break
}
}
if c != a.c {
t.Errorf("%s%+v\n\tgot c = %#x; want %#x", msg, a, c, a.c)
}
}
func makeFunVW(f func(z, x []Word, s uint) (c Word)) funVW {
return func(z, x []Word, s Word) (c Word) {
return f(z, x, uint(s))
}
}
func TestFunVW(t *testing.T) {
for _, a := range sumVW {
arg := a
testFunVW(t, "addVW_g", addVW_g, arg)
testFunVW(t, "addVW", addVW, arg)
arg = argVW{a.x, a.z, a.y, a.c}
testFunVW(t, "subVW_g", subVW_g, arg)
testFunVW(t, "subVW", subVW, arg)
}
shlVW_g := makeFunVW(shlVU_g)
shlVW := makeFunVW(shlVU)
for _, a := range lshVW {
arg := a
testFunVW(t, "shlVU_g", shlVW_g, arg)
testFunVW(t, "shlVU", shlVW, arg)
}
shrVW_g := makeFunVW(shrVU_g)
shrVW := makeFunVW(shrVU)
for _, a := range rshVW {
arg := a
testFunVW(t, "shrVU_g", shrVW_g, arg)
testFunVW(t, "shrVU", shrVW, arg)
}
}
type argVU struct {
d []Word // d is a Word slice, the input parameters x and z come from this array.
l uint // l is the length of the input parameters x and z.
xp uint // xp is the starting position of the input parameter x, x := d[xp:xp+l].
zp uint // zp is the starting position of the input parameter z, z := d[zp:zp+l].
s uint // s is the shift number.
r []Word // r is the expected output result z.
c Word // c is the expected return value.
m string // message.
}
var argshlVU = []argVU{
// test cases for shlVU
{[]Word{1, _M, _M, _M, _M, _M, 3 << (_W - 2), 0}, 7, 0, 0, 1, []Word{2, _M - 1, _M, _M, _M, _M, 1<<(_W-1) + 1}, 1, "complete overlap of shlVU"},
{[]Word{1, _M, _M, _M, _M, _M, 3 << (_W - 2), 0, 0, 0, 0}, 7, 0, 3, 1, []Word{2, _M - 1, _M, _M, _M, _M, 1<<(_W-1) + 1}, 1, "partial overlap by half of shlVU"},
{[]Word{1, _M, _M, _M, _M, _M, 3 << (_W - 2), 0, 0, 0, 0, 0, 0, 0}, 7, 0, 6, 1, []Word{2, _M - 1, _M, _M, _M, _M, 1<<(_W-1) + 1}, 1, "partial overlap by 1 Word of shlVU"},
{[]Word{1, _M, _M, _M, _M, _M, 3 << (_W - 2), 0, 0, 0, 0, 0, 0, 0, 0}, 7, 0, 7, 1, []Word{2, _M - 1, _M, _M, _M, _M, 1<<(_W-1) + 1}, 1, "no overlap of shlVU"},
}
var argshrVU = []argVU{
// test cases for shrVU
{[]Word{0, 3, _M, _M, _M, _M, _M, 1 << (_W - 1)}, 7, 1, 1, 1, []Word{1<<(_W-1) + 1, _M, _M, _M, _M, _M >> 1, 1 << (_W - 2)}, 1 << (_W - 1), "complete overlap of shrVU"},
{[]Word{0, 0, 0, 0, 3, _M, _M, _M, _M, _M, 1 << (_W - 1)}, 7, 4, 1, 1, []Word{1<<(_W-1) + 1, _M, _M, _M, _M, _M >> 1, 1 << (_W - 2)}, 1 << (_W - 1), "partial overlap by half of shrVU"},
{[]Word{0, 0, 0, 0, 0, 0, 0, 3, _M, _M, _M, _M, _M, 1 << (_W - 1)}, 7, 7, 1, 1, []Word{1<<(_W-1) + 1, _M, _M, _M, _M, _M >> 1, 1 << (_W - 2)}, 1 << (_W - 1), "partial overlap by 1 Word of shrVU"},
{[]Word{0, 0, 0, 0, 0, 0, 0, 0, 3, _M, _M, _M, _M, _M, 1 << (_W - 1)}, 7, 8, 1, 1, []Word{1<<(_W-1) + 1, _M, _M, _M, _M, _M >> 1, 1 << (_W - 2)}, 1 << (_W - 1), "no overlap of shrVU"},
}
func testShiftFunc(t *testing.T, f func(z, x []Word, s uint) Word, a argVU) {
// save a.d for error message, or it will be overwritten.
b := make([]Word, len(a.d))
copy(b, a.d)
z := a.d[a.zp : a.zp+a.l]
x := a.d[a.xp : a.xp+a.l]
c := f(z, x, a.s)
for i, zi := range z {
if zi != a.r[i] {
t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot z[%d] = %#x; want %#x", b, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, i, zi, a.r[i])
break
}
}
if c != a.c {
t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot c = %#x; want %#x", b, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, c, a.c)
}
}
func TestShiftOverlap(t *testing.T) {
for _, a := range argshlVU {
arg := a
testShiftFunc(t, shlVU, arg)
}
for _, a := range argshrVU {
arg := a
testShiftFunc(t, shrVU, arg)
}
}
func TestIssue31084(t *testing.T) {
// compute 10^n via 5^n << n.
const n = 165
p := nat(nil).expNN(nat{5}, nat{n}, nil)
p = p.shl(p, uint(n))
got := string(p.utoa(10))
want := "1" + strings.Repeat("0", n)
if got != want {
t.Errorf("shl(%v, %v)\n\tgot %s; want %s\n", p, uint(n), got, want)
}
}
func BenchmarkAddVW(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
x := rndV(n)
y := rndW()
z := make([]Word, n)
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _S))
for i := 0; i < b.N; i++ {
addVW(z, x, y)
}
})
}
}
func BenchmarkSubVW(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
x := rndV(n)
y := rndW()
z := make([]Word, n)
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _S))
for i := 0; i < b.N; i++ {
subVW(z, x, y)
}
})
}
}
type funVWW func(z, x []Word, y, r Word) (c Word)
type argVWW struct {
z, x nat
y, r Word
c Word
}
var prodVWW = []argVWW{
{},
{nat{0}, nat{0}, 0, 0, 0},
{nat{991}, nat{0}, 0, 991, 0},
{nat{0}, nat{_M}, 0, 0, 0},
{nat{991}, nat{_M}, 0, 991, 0},
{nat{0}, nat{0}, _M, 0, 0},
{nat{991}, nat{0}, _M, 991, 0},
{nat{1}, nat{1}, 1, 0, 0},
{nat{992}, nat{1}, 1, 991, 0},
{nat{22793}, nat{991}, 23, 0, 0},
{nat{22800}, nat{991}, 23, 7, 0},
{nat{0, 0, 0, 22793}, nat{0, 0, 0, 991}, 23, 0, 0},
{nat{7, 0, 0, 22793}, nat{0, 0, 0, 991}, 23, 7, 0},
{nat{0, 0, 0, 0}, nat{7893475, 7395495, 798547395, 68943}, 0, 0, 0},
{nat{991, 0, 0, 0}, nat{7893475, 7395495, 798547395, 68943}, 0, 991, 0},
{nat{0, 0, 0, 0}, nat{0, 0, 0, 0}, 894375984, 0, 0},
{nat{991, 0, 0, 0}, nat{0, 0, 0, 0}, 894375984, 991, 0},
{nat{_M << 1 & _M}, nat{_M}, 1 << 1, 0, _M >> (_W - 1)},
{nat{_M<<1&_M + 1}, nat{_M}, 1 << 1, 1, _M >> (_W - 1)},
{nat{_M << 7 & _M}, nat{_M}, 1 << 7, 0, _M >> (_W - 7)},
{nat{_M<<7&_M + 1<<6}, nat{_M}, 1 << 7, 1 << 6, _M >> (_W - 7)},
{nat{_M << 7 & _M, _M, _M, _M}, nat{_M, _M, _M, _M}, 1 << 7, 0, _M >> (_W - 7)},
{nat{_M<<7&_M + 1<<6, _M, _M, _M}, nat{_M, _M, _M, _M}, 1 << 7, 1 << 6, _M >> (_W - 7)},
}
func testFunVWW(t *testing.T, msg string, f funVWW, a argVWW) {
z := make(nat, len(a.z))
c := f(z, a.x, a.y, a.r)
for i, zi := range z {
if zi != a.z[i] {
t.Errorf("%s%+v\n\tgot z[%d] = %#x; want %#x", msg, a, i, zi, a.z[i])
break
}
}
if c != a.c {
t.Errorf("%s%+v\n\tgot c = %#x; want %#x", msg, a, c, a.c)
}
}
// TODO(gri) mulAddVWW and divWVW are symmetric operations but
// their signature is not symmetric. Try to unify.
type funWVW func(z []Word, xn Word, x []Word, y Word) (r Word)
type argWVW struct {
z nat
xn Word
x nat
y Word
r Word
}
func testFunWVW(t *testing.T, msg string, f funWVW, a argWVW) {
z := make(nat, len(a.z))
r := f(z, a.xn, a.x, a.y)
for i, zi := range z {
if zi != a.z[i] {
t.Errorf("%s%+v\n\tgot z[%d] = %#x; want %#x", msg, a, i, zi, a.z[i])
break
}
}
if r != a.r {
t.Errorf("%s%+v\n\tgot r = %#x; want %#x", msg, a, r, a.r)
}
}
func TestFunVWW(t *testing.T) {
for _, a := range prodVWW {
arg := a
testFunVWW(t, "mulAddVWW_g", mulAddVWW_g, arg)
testFunVWW(t, "mulAddVWW", mulAddVWW, arg)
if a.y != 0 && a.r < a.y {
arg := argWVW{a.x, a.c, a.z, a.y, a.r}
testFunWVW(t, "divWVW_g", divWVW_g, arg)
testFunWVW(t, "divWVW", divWVW, arg)
}
}
}
var mulWWTests = []struct {
x, y Word
q, r Word
}{
{_M, _M, _M - 1, 1},
// 32 bit only: {0xc47dfa8c, 50911, 0x98a4, 0x998587f4},
}
func TestMulWW(t *testing.T) {
for i, test := range mulWWTests {
q, r := mulWW_g(test.x, test.y)
if q != test.q || r != test.r {
t.Errorf("#%d got (%x, %x) want (%x, %x)", i, q, r, test.q, test.r)
}
}
}
var mulAddWWWTests = []struct {
x, y, c Word
q, r Word
}{
// TODO(agl): These will only work on 64-bit platforms.
// {15064310297182388543, 0xe7df04d2d35d5d80, 13537600649892366549, 13644450054494335067, 10832252001440893781},
// {15064310297182388543, 0xdab2f18048baa68d, 13644450054494335067, 12869334219691522700, 14233854684711418382},
{_M, _M, 0, _M - 1, 1},
{_M, _M, _M, _M, 0},
}
func TestMulAddWWW(t *testing.T) {
for i, test := range mulAddWWWTests {
q, r := mulAddWWW_g(test.x, test.y, test.c)
if q != test.q || r != test.r {
t.Errorf("#%d got (%x, %x) want (%x, %x)", i, q, r, test.q, test.r)
}
}
}
func BenchmarkMulAddVWW(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
z := make([]Word, n+1)
x := rndV(n)
y := rndW()
r := rndW()
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _W))
for i := 0; i < b.N; i++ {
mulAddVWW(z, x, y, r)
}
})
}
}
func BenchmarkAddMulVVW(b *testing.B) {
for _, n := range benchSizes {
if isRaceBuilder && n > 1e3 {
continue
}
x := rndV(n)
y := rndW()
z := make([]Word, n)
b.Run(fmt.Sprint(n), func(b *testing.B) {
b.SetBytes(int64(n * _W))
for i := 0; i < b.N; i++ {
addMulVVW(z, x, y)
}
})
}
}
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