mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
540 lines
18 KiB
Go
540 lines
18 KiB
Go
package decimal
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import (
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"math"
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"math/rand"
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"reflect"
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"testing"
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)
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func TestRoundToDecimalDigits(t *testing.T) {
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f := func(f float64, digits int, resultExpected float64) {
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t.Helper()
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result := RoundToDecimalDigits(f, digits)
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if math.IsNaN(result) {
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if IsStaleNaN(resultExpected) {
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if !IsStaleNaN(result) {
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t.Fatalf("unexpected stale mark value; got %016X; want %016X", math.Float64bits(result), staleNaNBits)
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}
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return
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}
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if !math.IsNaN(resultExpected) {
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t.Fatalf("unexpected result; got %v; want %v", result, resultExpected)
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}
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return
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}
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if result != resultExpected {
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t.Fatalf("unexpected result; got %v; want %v", result, resultExpected)
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}
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}
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f(12.34, 0, 12)
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f(12.57, 0, 13)
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f(-1.578, 2, -1.58)
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f(-1.578, 3, -1.578)
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f(1234, -2, 1200)
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f(1235, -1, 1240)
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f(1234, 0, 1234)
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f(1234.6, 0, 1235)
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f(123.4e-99, 99, 123e-99)
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f(nan, 10, nan)
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f(StaleNaN, 10, StaleNaN)
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}
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var nan = math.NaN()
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func TestRoundToSignificantFigures(t *testing.T) {
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f := func(f float64, digits int, resultExpected float64) {
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t.Helper()
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result := RoundToSignificantFigures(f, digits)
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if math.IsNaN(result) {
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if IsStaleNaN(resultExpected) {
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if !IsStaleNaN(result) {
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t.Fatalf("unexpected stale mark value; got %016X; want %016X", math.Float64bits(result), staleNaNBits)
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}
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return
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}
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if !math.IsNaN(resultExpected) {
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t.Fatalf("unexpected result; got %v; want %v", result, resultExpected)
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}
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return
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}
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if result != resultExpected {
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t.Fatalf("unexpected result; got %v; want %v", result, resultExpected)
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}
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}
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f(1234, 0, 1234)
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f(-12.34, 20, -12.34)
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f(12, 1, 10)
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f(25, 1, 30)
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f(2.5, 1, 3)
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f(-0.56, 1, -0.6)
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f(1234567, 3, 1230000)
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f(-1.234567, 4, -1.235)
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f(nan, 10, nan)
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f(StaleNaN, 10, StaleNaN)
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}
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func TestPositiveFloatToDecimal(t *testing.T) {
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f := func(f float64, decimalExpected int64, exponentExpected int16) {
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t.Helper()
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decimal, exponent := positiveFloatToDecimal(f)
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if decimal != decimalExpected {
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t.Fatalf("unexpected decimal for positiveFloatToDecimal(%f); got %d; want %d", f, decimal, decimalExpected)
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}
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if exponent != exponentExpected {
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t.Fatalf("unexpected exponent for positiveFloatToDecimal(%f); got %d; want %d", f, exponent, exponentExpected)
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}
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}
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f(0, 0, 1) // The exponent is 1 is OK here. See comment in positiveFloatToDecimal.
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f(1, 1, 0)
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f(30, 3, 1)
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f(12345678900000000, 123456789, 8)
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f(12345678901234567, 12345678901234568, 0)
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f(1234567890123456789, 12345678901234567, 2)
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f(12345678901234567890, 12345678901234567, 3)
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f(18446744073670737131, 18446744073670737, 3)
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f(123456789012345678901, 12345678901234568, 4)
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f(1<<53, 1<<53, 0)
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f(1<<54, 18014398509481984, 0)
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f(1<<55, 3602879701896396, 1)
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f(1<<62, 4611686018427387, 3)
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f(1<<63, 9223372036854775, 3)
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// Skip this test, since M1 returns 18446744073709551 instead of 18446744073709548
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1653
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// f(1<<64, 18446744073709548, 3)
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f(1<<65, 368934881474191, 5)
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f(1<<66, 737869762948382, 5)
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f(1<<67, 1475739525896764, 5)
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f(0.1, 1, -1)
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f(123456789012345678e-5, 12345678901234568, -4)
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f(1234567890123456789e-10, 12345678901234568, -8)
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f(1234567890123456789e-14, 1234567890123, -8)
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f(1234567890123456789e-17, 12345678901234, -12)
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f(1234567890123456789e-20, 1234567890123, -14)
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f(0.000874957, 874957, -9)
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f(0.001130435, 1130435, -9)
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f(vInfPos, 9223372036854775, 3)
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f(vMax, 9223372036854775, 3)
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// Extreme cases. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1114
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f(2.964393875e-100, 2964393875, -109)
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f(2.964393875e-309, 2964393875, -318)
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f(2.964393875e-314, 296439387505, -325)
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f(2.964393875e-315, 2964393875047, -327)
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f(2.964393875e-320, 296439387505, -331)
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f(2.964393875e-324, 494065645841, -335)
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f(2.964393875e-325, 0, 1)
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f(2.964393875e+307, 2964393875, 298)
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f(9.964393875e+307, 9964393875, 298)
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f(1.064393875e+308, 1064393875, 299)
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f(1.797393875e+308, 1797393875, 299)
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}
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func TestAppendDecimalToFloat(t *testing.T) {
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testAppendDecimalToFloat(t, []int64{}, 0, nil)
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testAppendDecimalToFloat(t, []int64{0}, 0, []float64{0})
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testAppendDecimalToFloat(t, []int64{0}, 10, []float64{0})
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testAppendDecimalToFloat(t, []int64{0}, -10, []float64{0})
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testAppendDecimalToFloat(t, []int64{-1, -10, 0, 100}, 2, []float64{-1e2, -1e3, 0, 1e4})
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testAppendDecimalToFloat(t, []int64{-1, -10, 0, 100}, -2, []float64{-1e-2, -1e-1, 0, 1})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -5, []float64{8.74957, 1.130435e1})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -6, []float64{8.74957e-1, 1.130435})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -7, []float64{8.74957e-2, 1.130435e-1})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -8, []float64{8.74957e-3, 1.130435e-2})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -9, []float64{8.74957e-4, 1.130435e-3})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -10, []float64{8.74957e-5, 1.130435e-4})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -11, []float64{8.74957e-6, 1.130435e-5})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -12, []float64{8.74957e-7, 1.130435e-6})
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testAppendDecimalToFloat(t, []int64{874957, 1130435}, -13, []float64{8.74957e-8, 1.130435e-7})
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testAppendDecimalToFloat(t, []int64{vMax, vMin, 1, 2}, 4, []float64{vMax * 1e4, vMin * 1e4, 1e4, 2e4})
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testAppendDecimalToFloat(t, []int64{vMax, vMin, 1, 2}, -4, []float64{vMax * 1e-4, vMin * 1e-4, 1e-4, 2e-4})
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testAppendDecimalToFloat(t, []int64{vInfPos, vInfNeg, 1, 2}, 0, []float64{infPos, infNeg, 1, 2})
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testAppendDecimalToFloat(t, []int64{vInfPos, vInfNeg, 1, 2}, 4, []float64{infPos, infNeg, 1e4, 2e4})
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testAppendDecimalToFloat(t, []int64{vInfPos, vInfNeg, 1, 2}, -4, []float64{infPos, infNeg, 1e-4, 2e-4})
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testAppendDecimalToFloat(t, []int64{1234, vStaleNaN, 1, 2}, 0, []float64{1234, StaleNaN, 1, 2})
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testAppendDecimalToFloat(t, []int64{vInfPos, vStaleNaN, vMin, 2}, 4, []float64{infPos, StaleNaN, vMin * 1e4, 2e4})
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testAppendDecimalToFloat(t, []int64{vInfPos, vStaleNaN, vMin, 2}, -4, []float64{infPos, StaleNaN, vMin * 1e-4, 2e-4})
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}
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func testAppendDecimalToFloat(t *testing.T, va []int64, e int16, fExpected []float64) {
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t.Helper()
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f := AppendDecimalToFloat(nil, va, e)
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if !equalValues(f, fExpected) {
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t.Fatalf("unexpected f for va=%d, e=%d: got\n%v; expecting\n%v", va, e, f, fExpected)
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}
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prefix := []float64{1, 2, 3, 4}
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f = AppendDecimalToFloat(prefix, va, e)
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if !equalValues(f[:len(prefix)], prefix) {
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t.Fatalf("unexpected prefix for va=%d, e=%d; got\n%v; expecting\n%v", va, e, f[:len(prefix)], prefix)
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}
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if fExpected == nil {
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fExpected = []float64{}
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}
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if !equalValues(f[len(prefix):], fExpected) {
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t.Fatalf("unexpected prefixed f for va=%d, e=%d: got\n%v; expecting\n%v", va, e, f[len(prefix):], fExpected)
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}
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}
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func equalValues(a, b []float64) bool {
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if len(a) != len(b) {
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return false
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}
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for i, va := range a {
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vb := b[i]
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if math.Float64bits(va) != math.Float64bits(vb) {
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return false
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}
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}
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return true
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}
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func TestCalibrateScale(t *testing.T) {
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testCalibrateScale(t, []int64{}, []int64{}, 0, 0, []int64{}, []int64{}, 0)
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testCalibrateScale(t, []int64{0}, []int64{0}, 0, 0, []int64{0}, []int64{0}, 0)
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testCalibrateScale(t, []int64{0}, []int64{1}, 0, 0, []int64{0}, []int64{1}, 0)
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testCalibrateScale(t, []int64{1, 0, 2}, []int64{5, -3}, 0, 1, []int64{1, 0, 2}, []int64{50, -30}, 0)
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testCalibrateScale(t, []int64{-1, 2}, []int64{5, 6, 3}, 2, -1, []int64{-1000, 2000}, []int64{5, 6, 3}, -1)
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testCalibrateScale(t, []int64{123, -456, 94}, []int64{-9, 4, -3, 45}, -3, -3, []int64{123, -456, 94}, []int64{-9, 4, -3, 45}, -3)
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testCalibrateScale(t, []int64{1e18, 1, 0}, []int64{3, 456}, 0, -2, []int64{1e18, 1, 0}, []int64{0, 4}, 0)
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testCalibrateScale(t, []int64{12345, 678}, []int64{12, -1e17, -3}, -3, 0, []int64{123, 6}, []int64{120, -1e18, -30}, -1)
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testCalibrateScale(t, []int64{1, 2}, nil, 12, 34, []int64{1, 2}, nil, 12)
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testCalibrateScale(t, nil, []int64{3, 1}, 12, 34, nil, []int64{3, 1}, 34)
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testCalibrateScale(t, []int64{923}, []int64{2, 3}, 100, -100, []int64{923e15}, []int64{0, 0}, 85)
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testCalibrateScale(t, []int64{923}, []int64{2, 3}, -100, 100, []int64{0}, []int64{2e18, 3e18}, 82)
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testCalibrateScale(t, []int64{123, 456, 789, 135}, []int64{}, -12, -10, []int64{123, 456, 789, 135}, []int64{}, -12)
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testCalibrateScale(t, []int64{123, 456, 789, 135}, []int64{}, -10, -12, []int64{123, 456, 789, 135}, []int64{}, -10)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{500, 100}, 0, 0, []int64{vInfPos, 1200}, []int64{500, 100}, 0)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{500, 100}, 0, 2, []int64{vInfPos, 1200}, []int64{500e2, 100e2}, 0)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{500, 100}, 0, -2, []int64{vInfPos, 12e4}, []int64{500, 100}, -2)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{3500, 100}, 0, -3, []int64{vInfPos, 12e5}, []int64{3500, 100}, -3)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{35, 1}, 0, 40, []int64{vInfPos, 0}, []int64{35e17, 1e17}, 23)
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testCalibrateScale(t, []int64{vInfPos, 1200}, []int64{35, 1}, 40, 0, []int64{vInfPos, 12e17}, []int64{0, 0}, 25)
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testCalibrateScale(t, []int64{vInfNeg, 1200}, []int64{35, 1}, 35, -5, []int64{vInfNeg, 12e17}, []int64{0, 0}, 20)
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testCalibrateScale(t, []int64{vMax, vMin, 123}, []int64{100}, 0, 3, []int64{vMax, vMin, 123}, []int64{100e3}, 0)
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testCalibrateScale(t, []int64{vMax, vMin, 123}, []int64{100}, 3, 0, []int64{vMax, vMin, 123}, []int64{0}, 3)
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testCalibrateScale(t, []int64{vMax, vMin, 123}, []int64{100}, 0, 30, []int64{92233, -92233, 0}, []int64{100e16}, 14)
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testCalibrateScale(t, []int64{vStaleNaN, vMin, 123}, []int64{100}, 0, 30, []int64{vStaleNaN, -92233, 0}, []int64{100e16}, 14)
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/805
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testCalibrateScale(t, []int64{123}, []int64{vInfPos}, 0, 0, []int64{123}, []int64{vInfPos}, 0)
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testCalibrateScale(t, []int64{123, vInfPos}, []int64{vInfNeg}, 0, 0, []int64{123, vInfPos}, []int64{vInfNeg}, 0)
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testCalibrateScale(t, []int64{123, vInfPos, vInfNeg}, []int64{456}, 0, 0, []int64{123, vInfPos, vInfNeg}, []int64{456}, 0)
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testCalibrateScale(t, []int64{123, vInfPos, vInfNeg, 456}, []int64{}, 0, 0, []int64{123, vInfPos, vInfNeg, 456}, []int64{}, 0)
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testCalibrateScale(t, []int64{123, vInfPos}, []int64{vInfNeg, 456}, 0, 0, []int64{123, vInfPos}, []int64{vInfNeg, 456}, 0)
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testCalibrateScale(t, []int64{123, vInfPos}, []int64{vInfNeg, 456}, 0, 10, []int64{123, vInfPos}, []int64{vInfNeg, 456e10}, 0)
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}
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func testCalibrateScale(t *testing.T, a, b []int64, ae, be int16, aExpected, bExpected []int64, eExpected int16) {
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t.Helper()
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if a == nil {
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a = []int64{}
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}
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if b == nil {
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b = []int64{}
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}
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if aExpected == nil {
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aExpected = []int64{}
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}
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if bExpected == nil {
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bExpected = []int64{}
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}
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aCopy := append([]int64{}, a...)
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bCopy := append([]int64{}, b...)
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e := CalibrateScale(aCopy, ae, bCopy, be)
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if e != eExpected {
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t.Fatalf("unexpected e for a=%d, b=%d, ae=%d, be=%d; got %d; expecting %d", a, b, ae, be, e, eExpected)
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}
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if !reflect.DeepEqual(aCopy, aExpected) {
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t.Fatalf("unexpected a for b=%d, ae=%d, be=%d; got\n%d; expecting\n%d", b, ae, be, aCopy, aExpected)
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}
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if !reflect.DeepEqual(bCopy, bExpected) {
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t.Fatalf("unexpected b for a=%d, ae=%d, be=%d; got\n%d; expecting\n%d", a, ae, be, bCopy, bExpected)
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}
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// Try reverse args.
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aCopy = append([]int64{}, a...)
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bCopy = append([]int64{}, b...)
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e = CalibrateScale(bCopy, be, aCopy, ae)
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if e != eExpected {
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t.Fatalf("reverse: unexpected e for a=%d, b=%d, ae=%d, be=%d; got %d; expecting %d", a, b, ae, be, e, eExpected)
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}
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if !reflect.DeepEqual(aCopy, aExpected) {
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t.Fatalf("reverse: unexpected a for b=%d, ae=%d, be=%d; got\n%d; expecting\n%d", b, ae, be, aCopy, aExpected)
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}
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if !reflect.DeepEqual(bCopy, bExpected) {
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t.Fatalf("reverse: unexpected b for a=%d, ae=%d, be=%d; got\n%d; expecting\n%d", a, ae, be, bCopy, bExpected)
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}
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}
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func TestMaxUpExponent(t *testing.T) {
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f := func(v int64, eExpected int16) {
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t.Helper()
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e := maxUpExponent(v)
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if e != eExpected {
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t.Fatalf("unexpected e for v=%d; got %d; expecting %d", v, e, eExpected)
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}
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}
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f(vInfPos, 1024)
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f(vInfNeg, 1024)
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f(vStaleNaN, 1024)
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f(vMin, 0)
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f(vMax, 0)
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f(0, 1024)
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f(1, 18)
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f(12, 17)
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f(123, 16)
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f(1234, 15)
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f(12345, 14)
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f(123456, 13)
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f(1234567, 12)
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f(12345678, 11)
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f(123456789, 10)
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f(1234567890, 9)
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f(12345678901, 8)
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f(123456789012, 7)
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f(1234567890123, 6)
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f(12345678901234, 5)
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f(123456789012345, 4)
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f(1234567890123456, 3)
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f(12345678901234567, 2)
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f(123456789012345678, 1)
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f(1234567890123456789, 0)
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f(923456789012345678, 0)
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f(92345678901234567, 1)
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f(9234567890123456, 2)
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f(923456789012345, 3)
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f(92345678901234, 4)
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f(9234567890123, 5)
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f(923456789012, 6)
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f(92345678901, 7)
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f(9234567890, 8)
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f(923456789, 9)
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f(92345678, 10)
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f(9234567, 11)
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f(923456, 12)
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f(92345, 13)
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f(9234, 14)
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f(923, 15)
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f(92, 17)
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f(9, 18)
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f(-1, 18)
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f(-12, 17)
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f(-123, 16)
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f(-1234, 15)
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f(-12345, 14)
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f(-123456, 13)
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f(-1234567, 12)
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f(-12345678, 11)
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f(-123456789, 10)
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f(-1234567890, 9)
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f(-12345678901, 8)
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f(-123456789012, 7)
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f(-1234567890123, 6)
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f(-12345678901234, 5)
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|
f(-123456789012345, 4)
|
|
f(-1234567890123456, 3)
|
|
f(-12345678901234567, 2)
|
|
f(-123456789012345678, 1)
|
|
f(-1234567890123456789, 0)
|
|
f(-923456789012345678, 0)
|
|
f(-92345678901234567, 1)
|
|
f(-9234567890123456, 2)
|
|
f(-923456789012345, 3)
|
|
f(-92345678901234, 4)
|
|
f(-9234567890123, 5)
|
|
f(-923456789012, 6)
|
|
f(-92345678901, 7)
|
|
f(-9234567890, 8)
|
|
f(-923456789, 9)
|
|
f(-92345678, 10)
|
|
f(-9234567, 11)
|
|
f(-923456, 12)
|
|
f(-92345, 13)
|
|
f(-9234, 14)
|
|
f(-923, 15)
|
|
f(-92, 17)
|
|
f(-9, 18)
|
|
}
|
|
|
|
func TestAppendFloatToDecimal(t *testing.T) {
|
|
// no-op
|
|
testAppendFloatToDecimal(t, []float64{}, nil, 0)
|
|
testAppendFloatToDecimal(t, []float64{0}, []int64{0}, 0)
|
|
testAppendFloatToDecimal(t, []float64{infPos, infNeg, 123}, []int64{vInfPos, vInfNeg, 123}, 0)
|
|
testAppendFloatToDecimal(t, []float64{infPos, infNeg, 123, 1e-4, 1e32}, []int64{vInfPos, vInfNeg, 0, 0, 1000000000000000000}, 14)
|
|
testAppendFloatToDecimal(t, []float64{StaleNaN, infNeg, 123, 1e-4, 1e32}, []int64{vStaleNaN, vInfNeg, 0, 0, 1000000000000000000}, 14)
|
|
testAppendFloatToDecimal(t, []float64{0, -0, 1, -1, 12345678, -123456789}, []int64{0, 0, 1, -1, 12345678, -123456789}, 0)
|
|
|
|
// upExp
|
|
testAppendFloatToDecimal(t, []float64{-24, 0, 4.123, 0.3}, []int64{-24000, 0, 4123, 300}, -3)
|
|
testAppendFloatToDecimal(t, []float64{0, 10.23456789, 1e2, 1e-3, 1e-4}, []int64{0, 1023456789, 1e10, 1e5, 1e4}, -8)
|
|
|
|
// downExp
|
|
testAppendFloatToDecimal(t, []float64{3e17, 7e-2, 5e-7, 45, 7e-1}, []int64{3e18, 0, 0, 450, 7}, -1)
|
|
testAppendFloatToDecimal(t, []float64{3e18, 1, 0.1, 13}, []int64{3e18, 1, 0, 13}, 0)
|
|
}
|
|
|
|
func testAppendFloatToDecimal(t *testing.T, fa []float64, daExpected []int64, eExpected int16) {
|
|
t.Helper()
|
|
|
|
da, e := AppendFloatToDecimal(nil, fa)
|
|
if e != eExpected {
|
|
t.Fatalf("unexpected e for fa=%f; got %d; expecting %d", fa, e, eExpected)
|
|
}
|
|
if !reflect.DeepEqual(da, daExpected) {
|
|
t.Fatalf("unexpected da for fa=%f; got\n%d; expecting\n%d", fa, da, daExpected)
|
|
}
|
|
|
|
daPrefix := []int64{1, 2, 3}
|
|
da, e = AppendFloatToDecimal(daPrefix, fa)
|
|
if e != eExpected {
|
|
t.Fatalf("unexpected e for fa=%f; got %d; expecting %d", fa, e, eExpected)
|
|
}
|
|
if !reflect.DeepEqual(da[:len(daPrefix)], daPrefix) {
|
|
t.Fatalf("unexpected daPrefix for fa=%f; got\n%d; expecting\n%d", fa, da[:len(daPrefix)], daPrefix)
|
|
}
|
|
if daExpected == nil {
|
|
daExpected = []int64{}
|
|
}
|
|
if !reflect.DeepEqual(da[len(daPrefix):], daExpected) {
|
|
t.Fatalf("unexpected da for fa=%f; got\n%d; expecting\n%d", fa, da[len(daPrefix):], daExpected)
|
|
}
|
|
}
|
|
|
|
func TestFloatToDecimal(t *testing.T) {
|
|
f := func(f float64, vExpected int64, eExpected int16) {
|
|
t.Helper()
|
|
v, e := FromFloat(f)
|
|
if v != vExpected {
|
|
t.Fatalf("unexpected v for f=%e; got %d; expecting %d", f, v, vExpected)
|
|
}
|
|
if e != eExpected {
|
|
t.Fatalf("unexpected e for f=%e; got %d; expecting %d", f, e, eExpected)
|
|
}
|
|
}
|
|
|
|
f(0, 0, 0)
|
|
f(1, 1, 0)
|
|
f(-1, -1, 0)
|
|
f(0.9, 9, -1)
|
|
f(0.99, 99, -2)
|
|
f(9, 9, 0)
|
|
f(99, 99, 0)
|
|
f(20, 2, 1)
|
|
f(100, 1, 2)
|
|
f(3000, 3, 3)
|
|
|
|
f(0.123, 123, -3)
|
|
f(-0.123, -123, -3)
|
|
f(1.2345, 12345, -4)
|
|
f(-1.2345, -12345, -4)
|
|
f(12000, 12, 3)
|
|
f(-12000, -12, 3)
|
|
f(1e-30, 1, -30)
|
|
f(-1e-30, -1, -30)
|
|
f(1e-260, 1, -260)
|
|
f(-1e-260, -1, -260)
|
|
f(321e260, 321, 260)
|
|
f(-321e260, -321, 260)
|
|
f(1234567890123, 1234567890123, 0)
|
|
f(-1234567890123, -1234567890123, 0)
|
|
f(123e5, 123, 5)
|
|
f(15e18, 15, 18)
|
|
|
|
f(math.Inf(1), vInfPos, 0)
|
|
f(math.Inf(-1), vInfNeg, 0)
|
|
f(StaleNaN, vStaleNaN, 0)
|
|
f(vInfPos, 9223372036854775, 3)
|
|
f(vInfNeg, -9223372036854775, 3)
|
|
f(vMax, 9223372036854775, 3)
|
|
f(vMin, -9223372036854775, 3)
|
|
f(1<<63-1, 9223372036854775, 3)
|
|
f(-1<<63, -9223372036854775, 3)
|
|
|
|
// Test precision loss due to conversionPrecision.
|
|
f(0.1234567890123456, 12345678901234, -14)
|
|
f(-123456.7890123456, -12345678901234, -8)
|
|
}
|
|
|
|
func TestFloatToDecimalRoundtrip(t *testing.T) {
|
|
f := func(f float64) {
|
|
t.Helper()
|
|
v, e := FromFloat(f)
|
|
fNew := ToFloat(v, e)
|
|
if !equalFloat(f, fNew) {
|
|
t.Fatalf("unexpected fNew for v=%d, e=%d; got %g; expecting %g", v, e, fNew, f)
|
|
}
|
|
|
|
v, e = FromFloat(-f)
|
|
fNew = ToFloat(v, e)
|
|
if !equalFloat(-f, fNew) {
|
|
t.Fatalf("unexepcted fNew for v=%d, e=%d; got %g; expecting %g", v, e, fNew, -f)
|
|
}
|
|
}
|
|
|
|
f(0)
|
|
f(1)
|
|
f(0.123)
|
|
f(1.2345)
|
|
f(12000)
|
|
f(1e-30)
|
|
f(1e-260)
|
|
f(321e260)
|
|
f(1234567890123)
|
|
f(12.34567890125)
|
|
f(1234567.8901256789)
|
|
f(15e18)
|
|
f(0.000874957)
|
|
f(0.001130435)
|
|
|
|
f(2933434554455e245)
|
|
f(3439234258934e-245)
|
|
f(float64(vInfPos))
|
|
f(float64(vInfNeg))
|
|
f(infPos)
|
|
f(infNeg)
|
|
f(vMax)
|
|
f(vMin)
|
|
f(vStaleNaN)
|
|
|
|
r := rand.New(rand.NewSource(1))
|
|
for i := 0; i < 1e4; i++ {
|
|
v := r.NormFloat64()
|
|
f(v)
|
|
f(v * 1e-6)
|
|
f(v * 1e6)
|
|
|
|
f(roundFloat(v, 20))
|
|
f(roundFloat(v, 10))
|
|
f(roundFloat(v, 5))
|
|
f(roundFloat(v, 0))
|
|
f(roundFloat(v, -5))
|
|
f(roundFloat(v, -10))
|
|
f(roundFloat(v, -20))
|
|
}
|
|
}
|
|
|
|
func roundFloat(f float64, exp int) float64 {
|
|
f *= math.Pow10(-exp)
|
|
return math.Trunc(f) * math.Pow10(exp)
|
|
}
|
|
|
|
func equalFloat(f1, f2 float64) bool {
|
|
if math.IsInf(f1, 1) {
|
|
return math.IsInf(f2, 1)
|
|
}
|
|
if math.IsInf(f2, -1) {
|
|
return math.IsInf(f2, -1)
|
|
}
|
|
eps := math.Abs(f1 - f2)
|
|
return eps == 0 || eps*conversionPrecision < math.Abs(f1)+math.Abs(f2)
|
|
}
|