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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [strconv/] [ftoa_test.go] - Blame information for rev 860

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1 747 jeremybenn 
// Copyright 2009 The Go Authors. All rights reserved.
2 
// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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5 
package strconv_test
6 
 
7 
import (
8 
        "math"
9 
        "math/rand"
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        . "strconv"
11 
        "testing"
12 
)
13 
 
14 
type ftoaTest struct {
15 
        f    float64
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        fmt  byte
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        prec int
18 
        s    string
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}
20 
 
21 
func fdiv(a, b float64) float64 { return a / b } // keep compiler in the dark
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23 
const (
24 
        below1e23 = 99999999999999974834176
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        above1e23 = 100000000000000008388608
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)
27 
 
28 
var ftoatests = []ftoaTest{
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        {1, 'e', 5, "1.00000e+00"},
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        {1, 'f', 5, "1.00000"},
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        {1, 'g', 5, "1"},
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        {1, 'g', -1, "1"},
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        {20, 'g', -1, "20"},
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        {1234567.8, 'g', -1, "1.2345678e+06"},
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        {200000, 'g', -1, "200000"},
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        {2000000, 'g', -1, "2e+06"},
37 
 
38 
        // g conversion and zero suppression
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        {400, 'g', 2, "4e+02"},
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        {40, 'g', 2, "40"},
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        {4, 'g', 2, "4"},
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        {.4, 'g', 2, "0.4"},
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        {.04, 'g', 2, "0.04"},
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        {.004, 'g', 2, "0.004"},
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        {.0004, 'g', 2, "0.0004"},
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        {.00004, 'g', 2, "4e-05"},
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        {.000004, 'g', 2, "4e-06"},
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49 
        {0, 'e', 5, "0.00000e+00"},
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        {0, 'f', 5, "0.00000"},
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        {0, 'g', 5, "0"},
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        {0, 'g', -1, "0"},
53 
 
54 
        {-1, 'e', 5, "-1.00000e+00"},
55 
        {-1, 'f', 5, "-1.00000"},
56 
        {-1, 'g', 5, "-1"},
57 
        {-1, 'g', -1, "-1"},
58 
 
59 
        {12, 'e', 5, "1.20000e+01"},
60 
        {12, 'f', 5, "12.00000"},
61 
        {12, 'g', 5, "12"},
62 
        {12, 'g', -1, "12"},
63 
 
64 
        {123456700, 'e', 5, "1.23457e+08"},
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        {123456700, 'f', 5, "123456700.00000"},
66 
        {123456700, 'g', 5, "1.2346e+08"},
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        {123456700, 'g', -1, "1.234567e+08"},
68 
 
69 
        {1.2345e6, 'e', 5, "1.23450e+06"},
70 
        {1.2345e6, 'f', 5, "1234500.00000"},
71 
        {1.2345e6, 'g', 5, "1.2345e+06"},
72 
 
73 
        {1e23, 'e', 17, "9.99999999999999916e+22"},
74 
        {1e23, 'f', 17, "99999999999999991611392.00000000000000000"},
75 
        {1e23, 'g', 17, "9.9999999999999992e+22"},
76 
 
77 
        {1e23, 'e', -1, "1e+23"},
78 
        {1e23, 'f', -1, "100000000000000000000000"},
79 
        {1e23, 'g', -1, "1e+23"},
80 
 
81 
        {below1e23, 'e', 17, "9.99999999999999748e+22"},
82 
        {below1e23, 'f', 17, "99999999999999974834176.00000000000000000"},
83 
        {below1e23, 'g', 17, "9.9999999999999975e+22"},
84 
 
85 
        {below1e23, 'e', -1, "9.999999999999997e+22"},
86 
        {below1e23, 'f', -1, "99999999999999970000000"},
87 
        {below1e23, 'g', -1, "9.999999999999997e+22"},
88 
 
89 
        {above1e23, 'e', 17, "1.00000000000000008e+23"},
90 
        {above1e23, 'f', 17, "100000000000000008388608.00000000000000000"},
91 
        {above1e23, 'g', 17, "1.0000000000000001e+23"},
92 
 
93 
        {above1e23, 'e', -1, "1.0000000000000001e+23"},
94 
        {above1e23, 'f', -1, "100000000000000010000000"},
95 
        {above1e23, 'g', -1, "1.0000000000000001e+23"},
96 
 
97 
        {fdiv(5e-304, 1e20), 'g', -1, "5e-324"},
98 
        {fdiv(-5e-304, 1e20), 'g', -1, "-5e-324"},
99 
 
100 
        {32, 'g', -1, "32"},
101 
        {32, 'g', 0, "3e+01"},
102 
 
103 
        {100, 'x', -1, "%x"},
104 
 
105 
        {math.NaN(), 'g', -1, "NaN"},
106 
        {-math.NaN(), 'g', -1, "NaN"},
107 
        {math.Inf(0), 'g', -1, "+Inf"},
108 
        {math.Inf(-1), 'g', -1, "-Inf"},
109 
        {-math.Inf(0), 'g', -1, "-Inf"},
110 
 
111 
        {-1, 'b', -1, "-4503599627370496p-52"},
112 
 
113 
        // fixed bugs
114 
        {0.9, 'f', 1, "0.9"},
115 
        {0.09, 'f', 1, "0.1"},
116 
        {0.0999, 'f', 1, "0.1"},
117 
        {0.05, 'f', 1, "0.1"},
118 
        {0.05, 'f', 0, "0"},
119 
        {0.5, 'f', 1, "0.5"},
120 
        {0.5, 'f', 0, "0"},
121 
        {1.5, 'f', 0, "2"},
122 
 
123 
        // http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
124 
        {2.2250738585072012e-308, 'g', -1, "2.2250738585072014e-308"},
125 
        // http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
126 
        {2.2250738585072011e-308, 'g', -1, "2.225073858507201e-308"},
127 
 
128 
        // Issue 2625.
129 
        {383260575764816448, 'f', 0, "383260575764816448"},
130 
        {383260575764816448, 'g', -1, "3.8326057576481645e+17"},
131 
}
132 
 
133 
func TestFtoa(t *testing.T) {
134 
        for i := 0; i < len(ftoatests); i++ {
135 
                test := &ftoatests[i]
136 
                s := FormatFloat(test.f, test.fmt, test.prec, 64)
137 
                if s != test.s {
138 
                        t.Error("testN=64", test.f, string(test.fmt), test.prec, "want", test.s, "got", s)
139 
                }
140 
                x := AppendFloat([]byte("abc"), test.f, test.fmt, test.prec, 64)
141 
                if string(x) != "abc"+test.s {
142 
                        t.Error("AppendFloat testN=64", test.f, string(test.fmt), test.prec, "want", "abc"+test.s, "got", string(x))
143 
                }
144 
                if float64(float32(test.f)) == test.f && test.fmt != 'b' {
145 
                        s := FormatFloat(test.f, test.fmt, test.prec, 32)
146 
                        if s != test.s {
147 
                                t.Error("testN=32", test.f, string(test.fmt), test.prec, "want", test.s, "got", s)
148 
                        }
149 
                        x := AppendFloat([]byte("abc"), test.f, test.fmt, test.prec, 32)
150 
                        if string(x) != "abc"+test.s {
151 
                                t.Error("AppendFloat testN=32", test.f, string(test.fmt), test.prec, "want", "abc"+test.s, "got", string(x))
152 
                        }
153 
                }
154 
        }
155 
}
156 
 
157 
func TestFtoaRandom(t *testing.T) {
158 
        N := int(1e4)
159 
        if testing.Short() {
160 
                N = 100
161 
        }
162 
        t.Logf("testing %d random numbers with fast and slow FormatFloat", N)
163 
        for i := 0; i < N; i++ {
164 
                bits := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
165 
                x := math.Float64frombits(bits)
166 
                shortFast := FormatFloat(x, 'g', -1, 64)
167 
                SetOptimize(false)
168 
                shortSlow := FormatFloat(x, 'g', -1, 64)
169 
                SetOptimize(true)
170 
                if shortSlow != shortFast {
171 
                        t.Errorf("%b printed as %s, want %s", x, shortFast, shortSlow)
172 
                }
173 
        }
174 
}
175 
 
176 
/* This test relies on escape analysis which gccgo does not yet do.
177 
 
178 
func TestAppendFloatDoesntAllocate(t *testing.T) {
179 
        n := numAllocations(func() {
180 
                var buf [64]byte
181 
                AppendFloat(buf[:0], 1.23, 'g', 5, 64)
182 
        })
183 
        want := 1 // TODO(bradfitz): this might be 0, once escape analysis is better
184 
        if n != want {
185 
                t.Errorf("with local buffer, did %d allocations, want %d", n, want)
186 
        }
187 
        n = numAllocations(func() {
188 
                AppendFloat(globalBuf[:0], 1.23, 'g', 5, 64)
189 
        })
190 
        if n != 0 {
191 
                t.Errorf("with reused buffer, did %d allocations, want 0", n)
192 
        }
193 
}
194 
 
195 
*/
196 
 
197 
func BenchmarkFormatFloatDecimal(b *testing.B) {
198 
        for i := 0; i < b.N; i++ {
199 
                FormatFloat(33909, 'g', -1, 64)
200 
        }
201 
}
202 
 
203 
func BenchmarkFormatFloat(b *testing.B) {
204 
        for i := 0; i < b.N; i++ {
205 
                FormatFloat(339.7784, 'g', -1, 64)
206 
        }
207 
}
208 
 
209 
func BenchmarkFormatFloatExp(b *testing.B) {
210 
        for i := 0; i < b.N; i++ {
211 
                FormatFloat(-5.09e75, 'g', -1, 64)
212 
        }
213 
}
214 
 
215 
func BenchmarkFormatFloatNegExp(b *testing.B) {
216 
        for i := 0; i < b.N; i++ {
217 
                FormatFloat(-5.11e-95, 'g', -1, 64)
218 
        }
219 
}
220 
 
221 
func BenchmarkFormatFloatBig(b *testing.B) {
222 
        for i := 0; i < b.N; i++ {
223 
                FormatFloat(123456789123456789123456789, 'g', -1, 64)
224 
        }
225 
}
226 
 
227 
func BenchmarkAppendFloatDecimal(b *testing.B) {
228 
        dst := make([]byte, 0, 30)
229 
        for i := 0; i < b.N; i++ {
230 
                AppendFloat(dst, 33909, 'g', -1, 64)
231 
        }
232 
}
233 
 
234 
func BenchmarkAppendFloat(b *testing.B) {
235 
        dst := make([]byte, 0, 30)
236 
        for i := 0; i < b.N; i++ {
237 
                AppendFloat(dst, 339.7784, 'g', -1, 64)
238 
        }
239 
}
240 
 
241 
func BenchmarkAppendFloatExp(b *testing.B) {
242 
        dst := make([]byte, 0, 30)
243 
        for i := 0; i < b.N; i++ {
244 
                AppendFloat(dst, -5.09e75, 'g', -1, 64)
245 
        }
246 
}
247 
 
248 
func BenchmarkAppendFloatNegExp(b *testing.B) {
249 
        dst := make([]byte, 0, 30)
250 
        for i := 0; i < b.N; i++ {
251 
                AppendFloat(dst, -5.11e-95, 'g', -1, 64)
252 
        }
253 
}
254 
 
255 
func BenchmarkAppendFloatBig(b *testing.B) {
256 
        dst := make([]byte, 0, 30)
257 
        for i := 0; i < b.N; i++ {
258 
                AppendFloat(dst, 123456789123456789123456789, 'g', -1, 64)
259 
        }
260 
}

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