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package common
import (
"math/big"
"testing"
"github.com/stretchr/testify/assert"
)
func TestConversions(t *testing.T) {
testVector := map[Float16]string{
0x307B: "123000000",
0x1DC6: "454500",
0xFFFF: "10235000000000000000000000000000000",
0x0000: "0",
0x0400: "0",
0x0001: "1",
0x0401: "1",
0x0800: "0",
0x0c00: "5",
0x0801: "10",
0x0c01: "15",
}
for test := range testVector {
fix := test.BigInt()
assert.Equal(t, fix.String(), testVector[test])
bi := big.NewInt(0)
bi.SetString(testVector[test], 10)
fl, err := NewFloat16(bi)
assert.Equal(t, nil, err)
fx2 := fl.BigInt()
assert.Equal(t, fx2.String(), testVector[test])
}
}
func TestFloorFix2Float(t *testing.T) {
testVector := map[string]Float16{
"87999990000000000": 0x776f,
"87950000000000001": 0x776f,
"87950000000000000": 0x776f,
"87949999999999999": 0x736f,
}
for test := range testVector {
bi := big.NewInt(0)
bi.SetString(test, 10)
testFloat := NewFloat16Floor(bi)
assert.Equal(t, testFloat, testVector[test])
}
}
func TestConversionLosses(t *testing.T) {
a := big.NewInt(1000)
b, err := NewFloat16(a)
assert.Equal(t, nil, err)
c := b.BigInt()
assert.Equal(t, c, a)
a = big.NewInt(1024)
b, err = NewFloat16(a)
assert.Equal(t, ErrRoundingLoss, err)
c = b.BigInt()
assert.NotEqual(t, c, a)
a = big.NewInt(32767)
b, err = NewFloat16(a)
assert.Equal(t, ErrRoundingLoss, err)
c = b.BigInt()
assert.NotEqual(t, c, a)
a = big.NewInt(32768)
b, err = NewFloat16(a)
assert.Equal(t, ErrRoundingLoss, err)
c = b.BigInt()
assert.NotEqual(t, c, a)
a = big.NewInt(65536000)
b, err = NewFloat16(a)
assert.Equal(t, ErrRoundingLoss, err)
c = b.BigInt()
assert.NotEqual(t, c, a)
}
func BenchmarkFloat16(b *testing.B) {
newBigInt := func(s string) *big.Int {
bigInt, ok := new(big.Int).SetString(s, 10)
if !ok {
panic("Bad big int")
}
return bigInt
}
type pair struct {
Float16 Float16
BigInt *big.Int
}
testVector := []pair{
{0x307B, newBigInt("123000000")},
{0x1DC6, newBigInt("454500")},
{0xFFFF, newBigInt("10235000000000000000000000000000000")},
{0x0000, newBigInt("0")},
{0x0400, newBigInt("0")},
{0x0001, newBigInt("1")},
{0x0401, newBigInt("1")},
{0x0800, newBigInt("0")},
{0x0c00, newBigInt("5")},
{0x0801, newBigInt("10")},
{0x0c01, newBigInt("15")},
}
b.Run("floorFix2Float()", func(b *testing.B) {
for i := 0; i < b.N; i++ {
NewFloat16Floor(testVector[i%len(testVector)].BigInt)
}
})
b.Run("NewFloat16()", func(b *testing.B) {
for i := 0; i < b.N; i++ {
_, _ = NewFloat16(testVector[i%len(testVector)].BigInt)
}
})
b.Run("Float16.BigInt()", func(b *testing.B) {
for i := 0; i < b.N; i++ {
testVector[i%len(testVector)].Float16.BigInt()
}
})
}