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| 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| 2 |
| 3 #include <stdlib.h> |
| 4 |
| 5 #include "bignum.h" |
| 6 #include "cctest.h" |
| 7 #include "diy-fp.h" |
| 8 #include "double.h" |
| 9 #include "strtod.h" |
| 10 #include "utils.h" |
| 11 |
| 12 using namespace double_conversion; |
| 13 |
| 14 static Vector<const char> StringToVector(const char* str) { |
| 15 return Vector<const char>(str, strlen(str)); |
| 16 } |
| 17 |
| 18 |
| 19 static double StrtodChar(const char* str, int exponent) { |
| 20 return Strtod(StringToVector(str), exponent); |
| 21 } |
| 22 |
| 23 |
| 24 TEST(Strtod) { |
| 25 Vector<const char> vector; |
| 26 |
| 27 vector = StringToVector("0"); |
| 28 CHECK_EQ(0.0, Strtod(vector, 1)); |
| 29 CHECK_EQ(0.0, Strtod(vector, 2)); |
| 30 CHECK_EQ(0.0, Strtod(vector, -2)); |
| 31 CHECK_EQ(0.0, Strtod(vector, -999)); |
| 32 CHECK_EQ(0.0, Strtod(vector, +999)); |
| 33 |
| 34 vector = StringToVector("1"); |
| 35 CHECK_EQ(1.0, Strtod(vector, 0)); |
| 36 CHECK_EQ(10.0, Strtod(vector, 1)); |
| 37 CHECK_EQ(100.0, Strtod(vector, 2)); |
| 38 CHECK_EQ(1e20, Strtod(vector, 20)); |
| 39 CHECK_EQ(1e22, Strtod(vector, 22)); |
| 40 CHECK_EQ(1e23, Strtod(vector, 23)); |
| 41 CHECK_EQ(1e35, Strtod(vector, 35)); |
| 42 CHECK_EQ(1e36, Strtod(vector, 36)); |
| 43 CHECK_EQ(1e37, Strtod(vector, 37)); |
| 44 CHECK_EQ(1e-1, Strtod(vector, -1)); |
| 45 CHECK_EQ(1e-2, Strtod(vector, -2)); |
| 46 CHECK_EQ(1e-5, Strtod(vector, -5)); |
| 47 CHECK_EQ(1e-20, Strtod(vector, -20)); |
| 48 CHECK_EQ(1e-22, Strtod(vector, -22)); |
| 49 CHECK_EQ(1e-23, Strtod(vector, -23)); |
| 50 CHECK_EQ(1e-25, Strtod(vector, -25)); |
| 51 CHECK_EQ(1e-39, Strtod(vector, -39)); |
| 52 |
| 53 vector = StringToVector("2"); |
| 54 CHECK_EQ(2.0, Strtod(vector, 0)); |
| 55 CHECK_EQ(20.0, Strtod(vector, 1)); |
| 56 CHECK_EQ(200.0, Strtod(vector, 2)); |
| 57 CHECK_EQ(2e20, Strtod(vector, 20)); |
| 58 CHECK_EQ(2e22, Strtod(vector, 22)); |
| 59 CHECK_EQ(2e23, Strtod(vector, 23)); |
| 60 CHECK_EQ(2e35, Strtod(vector, 35)); |
| 61 CHECK_EQ(2e36, Strtod(vector, 36)); |
| 62 CHECK_EQ(2e37, Strtod(vector, 37)); |
| 63 CHECK_EQ(2e-1, Strtod(vector, -1)); |
| 64 CHECK_EQ(2e-2, Strtod(vector, -2)); |
| 65 CHECK_EQ(2e-5, Strtod(vector, -5)); |
| 66 CHECK_EQ(2e-20, Strtod(vector, -20)); |
| 67 CHECK_EQ(2e-22, Strtod(vector, -22)); |
| 68 CHECK_EQ(2e-23, Strtod(vector, -23)); |
| 69 CHECK_EQ(2e-25, Strtod(vector, -25)); |
| 70 CHECK_EQ(2e-39, Strtod(vector, -39)); |
| 71 |
| 72 vector = StringToVector("9"); |
| 73 CHECK_EQ(9.0, Strtod(vector, 0)); |
| 74 CHECK_EQ(90.0, Strtod(vector, 1)); |
| 75 CHECK_EQ(900.0, Strtod(vector, 2)); |
| 76 CHECK_EQ(9e20, Strtod(vector, 20)); |
| 77 CHECK_EQ(9e22, Strtod(vector, 22)); |
| 78 CHECK_EQ(9e23, Strtod(vector, 23)); |
| 79 CHECK_EQ(9e35, Strtod(vector, 35)); |
| 80 CHECK_EQ(9e36, Strtod(vector, 36)); |
| 81 CHECK_EQ(9e37, Strtod(vector, 37)); |
| 82 CHECK_EQ(9e-1, Strtod(vector, -1)); |
| 83 CHECK_EQ(9e-2, Strtod(vector, -2)); |
| 84 CHECK_EQ(9e-5, Strtod(vector, -5)); |
| 85 CHECK_EQ(9e-20, Strtod(vector, -20)); |
| 86 CHECK_EQ(9e-22, Strtod(vector, -22)); |
| 87 CHECK_EQ(9e-23, Strtod(vector, -23)); |
| 88 CHECK_EQ(9e-25, Strtod(vector, -25)); |
| 89 CHECK_EQ(9e-39, Strtod(vector, -39)); |
| 90 |
| 91 vector = StringToVector("12345"); |
| 92 CHECK_EQ(12345.0, Strtod(vector, 0)); |
| 93 CHECK_EQ(123450.0, Strtod(vector, 1)); |
| 94 CHECK_EQ(1234500.0, Strtod(vector, 2)); |
| 95 CHECK_EQ(12345e20, Strtod(vector, 20)); |
| 96 CHECK_EQ(12345e22, Strtod(vector, 22)); |
| 97 CHECK_EQ(12345e23, Strtod(vector, 23)); |
| 98 CHECK_EQ(12345e30, Strtod(vector, 30)); |
| 99 CHECK_EQ(12345e31, Strtod(vector, 31)); |
| 100 CHECK_EQ(12345e32, Strtod(vector, 32)); |
| 101 CHECK_EQ(12345e35, Strtod(vector, 35)); |
| 102 CHECK_EQ(12345e36, Strtod(vector, 36)); |
| 103 CHECK_EQ(12345e37, Strtod(vector, 37)); |
| 104 CHECK_EQ(12345e-1, Strtod(vector, -1)); |
| 105 CHECK_EQ(12345e-2, Strtod(vector, -2)); |
| 106 CHECK_EQ(12345e-5, Strtod(vector, -5)); |
| 107 CHECK_EQ(12345e-20, Strtod(vector, -20)); |
| 108 CHECK_EQ(12345e-22, Strtod(vector, -22)); |
| 109 CHECK_EQ(12345e-23, Strtod(vector, -23)); |
| 110 CHECK_EQ(12345e-25, Strtod(vector, -25)); |
| 111 CHECK_EQ(12345e-39, Strtod(vector, -39)); |
| 112 |
| 113 vector = StringToVector("12345678901234"); |
| 114 CHECK_EQ(12345678901234.0, Strtod(vector, 0)); |
| 115 CHECK_EQ(123456789012340.0, Strtod(vector, 1)); |
| 116 CHECK_EQ(1234567890123400.0, Strtod(vector, 2)); |
| 117 CHECK_EQ(12345678901234e20, Strtod(vector, 20)); |
| 118 CHECK_EQ(12345678901234e22, Strtod(vector, 22)); |
| 119 CHECK_EQ(12345678901234e23, Strtod(vector, 23)); |
| 120 CHECK_EQ(12345678901234e30, Strtod(vector, 30)); |
| 121 CHECK_EQ(12345678901234e31, Strtod(vector, 31)); |
| 122 CHECK_EQ(12345678901234e32, Strtod(vector, 32)); |
| 123 CHECK_EQ(12345678901234e35, Strtod(vector, 35)); |
| 124 CHECK_EQ(12345678901234e36, Strtod(vector, 36)); |
| 125 CHECK_EQ(12345678901234e37, Strtod(vector, 37)); |
| 126 CHECK_EQ(12345678901234e-1, Strtod(vector, -1)); |
| 127 CHECK_EQ(12345678901234e-2, Strtod(vector, -2)); |
| 128 CHECK_EQ(12345678901234e-5, Strtod(vector, -5)); |
| 129 CHECK_EQ(12345678901234e-20, Strtod(vector, -20)); |
| 130 CHECK_EQ(12345678901234e-22, Strtod(vector, -22)); |
| 131 CHECK_EQ(12345678901234e-23, Strtod(vector, -23)); |
| 132 CHECK_EQ(12345678901234e-25, Strtod(vector, -25)); |
| 133 CHECK_EQ(12345678901234e-39, Strtod(vector, -39)); |
| 134 |
| 135 vector = StringToVector("123456789012345"); |
| 136 CHECK_EQ(123456789012345.0, Strtod(vector, 0)); |
| 137 CHECK_EQ(1234567890123450.0, Strtod(vector, 1)); |
| 138 CHECK_EQ(12345678901234500.0, Strtod(vector, 2)); |
| 139 CHECK_EQ(123456789012345e20, Strtod(vector, 20)); |
| 140 CHECK_EQ(123456789012345e22, Strtod(vector, 22)); |
| 141 CHECK_EQ(123456789012345e23, Strtod(vector, 23)); |
| 142 CHECK_EQ(123456789012345e35, Strtod(vector, 35)); |
| 143 CHECK_EQ(123456789012345e36, Strtod(vector, 36)); |
| 144 CHECK_EQ(123456789012345e37, Strtod(vector, 37)); |
| 145 CHECK_EQ(123456789012345e39, Strtod(vector, 39)); |
| 146 CHECK_EQ(123456789012345e-1, Strtod(vector, -1)); |
| 147 CHECK_EQ(123456789012345e-2, Strtod(vector, -2)); |
| 148 CHECK_EQ(123456789012345e-5, Strtod(vector, -5)); |
| 149 CHECK_EQ(123456789012345e-20, Strtod(vector, -20)); |
| 150 CHECK_EQ(123456789012345e-22, Strtod(vector, -22)); |
| 151 CHECK_EQ(123456789012345e-23, Strtod(vector, -23)); |
| 152 CHECK_EQ(123456789012345e-25, Strtod(vector, -25)); |
| 153 CHECK_EQ(123456789012345e-39, Strtod(vector, -39)); |
| 154 |
| 155 CHECK_EQ(0.0, StrtodChar("0", 12345)); |
| 156 CHECK_EQ(0.0, StrtodChar("", 1324)); |
| 157 CHECK_EQ(0.0, StrtodChar("000000000", 123)); |
| 158 CHECK_EQ(0.0, StrtodChar("2", -324)); |
| 159 CHECK_EQ(4e-324, StrtodChar("3", -324)); |
| 160 // It would be more readable to put non-zero literals on the left side (i.e. |
| 161 // CHECK_EQ(1e-325, StrtodChar("1", -325))), but then Gcc complains that |
| 162 // they are truncated to zero. |
| 163 CHECK_EQ(0.0, StrtodChar("1", -325)); |
| 164 CHECK_EQ(0.0, StrtodChar("1", -325)); |
| 165 CHECK_EQ(0.0, StrtodChar("20000", -328)); |
| 166 CHECK_EQ(40000e-328, StrtodChar("30000", -328)); |
| 167 CHECK_EQ(0.0, StrtodChar("10000", -329)); |
| 168 CHECK_EQ(0.0, StrtodChar("90000", -329)); |
| 169 CHECK_EQ(0.0, StrtodChar("000000001", -325)); |
| 170 CHECK_EQ(0.0, StrtodChar("000000001", -325)); |
| 171 CHECK_EQ(0.0, StrtodChar("0000000020000", -328)); |
| 172 CHECK_EQ(40000e-328, StrtodChar("00000030000", -328)); |
| 173 CHECK_EQ(0.0, StrtodChar("0000000010000", -329)); |
| 174 CHECK_EQ(0.0, StrtodChar("0000000090000", -329)); |
| 175 |
| 176 // It would be more readable to put the literals (and not Double::Infinity()) |
| 177 // on the left side (i.e. CHECK_EQ(1e309, StrtodChar("1", 309))), but then Gcc |
| 178 // complains that the floating constant exceeds range of 'double'. |
| 179 CHECK_EQ(Double::Infinity(), StrtodChar("1", 309)); |
| 180 CHECK_EQ(1e308, StrtodChar("1", 308)); |
| 181 CHECK_EQ(1234e305, StrtodChar("1234", 305)); |
| 182 CHECK_EQ(1234e304, StrtodChar("1234", 304)); |
| 183 CHECK_EQ(Double::Infinity(), StrtodChar("18", 307)); |
| 184 CHECK_EQ(17e307, StrtodChar("17", 307)); |
| 185 CHECK_EQ(Double::Infinity(), StrtodChar("0000001", 309)); |
| 186 CHECK_EQ(1e308, StrtodChar("00000001", 308)); |
| 187 CHECK_EQ(1234e305, StrtodChar("00000001234", 305)); |
| 188 CHECK_EQ(1234e304, StrtodChar("000000001234", 304)); |
| 189 CHECK_EQ(Double::Infinity(), StrtodChar("0000000018", 307)); |
| 190 CHECK_EQ(17e307, StrtodChar("0000000017", 307)); |
| 191 CHECK_EQ(Double::Infinity(), StrtodChar("1000000", 303)); |
| 192 CHECK_EQ(1e308, StrtodChar("100000", 303)); |
| 193 CHECK_EQ(1234e305, StrtodChar("123400000", 300)); |
| 194 CHECK_EQ(1234e304, StrtodChar("123400000", 299)); |
| 195 CHECK_EQ(Double::Infinity(), StrtodChar("180000000", 300)); |
| 196 CHECK_EQ(17e307, StrtodChar("170000000", 300)); |
| 197 CHECK_EQ(Double::Infinity(), StrtodChar("00000001000000", 303)); |
| 198 CHECK_EQ(1e308, StrtodChar("000000000000100000", 303)); |
| 199 CHECK_EQ(1234e305, StrtodChar("00000000123400000", 300)); |
| 200 CHECK_EQ(1234e304, StrtodChar("0000000123400000", 299)); |
| 201 CHECK_EQ(Double::Infinity(), StrtodChar("00000000180000000", 300)); |
| 202 CHECK_EQ(17e307, StrtodChar("00000000170000000", 300)); |
| 203 CHECK_EQ(1.7976931348623157E+308, StrtodChar("17976931348623157", 292)); |
| 204 CHECK_EQ(1.7976931348623158E+308, StrtodChar("17976931348623158", 292)); |
| 205 CHECK_EQ(Double::Infinity(), StrtodChar("17976931348623159", 292)); |
| 206 |
| 207 // The following number is the result of 89255.0/1e-22. Both floating-point |
| 208 // numbers can be accurately represented with doubles. However on Linux,x86 |
| 209 // the floating-point stack is set to 80bits and the double-rounding |
| 210 // introduces an error. |
| 211 CHECK_EQ(89255e-22, StrtodChar("89255", -22)); |
| 212 |
| 213 // Some random values. |
| 214 CHECK_EQ(358416272e-33, StrtodChar("358416272", -33)); |
| 215 CHECK_EQ(104110013277974872254e-225, |
| 216 StrtodChar("104110013277974872254", -225)); |
| 217 |
| 218 CHECK_EQ(123456789e108, StrtodChar("123456789", 108)); |
| 219 CHECK_EQ(123456789e109, StrtodChar("123456789", 109)); |
| 220 CHECK_EQ(123456789e110, StrtodChar("123456789", 110)); |
| 221 CHECK_EQ(123456789e111, StrtodChar("123456789", 111)); |
| 222 CHECK_EQ(123456789e112, StrtodChar("123456789", 112)); |
| 223 CHECK_EQ(123456789e113, StrtodChar("123456789", 113)); |
| 224 CHECK_EQ(123456789e114, StrtodChar("123456789", 114)); |
| 225 CHECK_EQ(123456789e115, StrtodChar("123456789", 115)); |
| 226 |
| 227 CHECK_EQ(1234567890123456789012345e108, |
| 228 StrtodChar("1234567890123456789012345", 108)); |
| 229 CHECK_EQ(1234567890123456789012345e109, |
| 230 StrtodChar("1234567890123456789012345", 109)); |
| 231 CHECK_EQ(1234567890123456789012345e110, |
| 232 StrtodChar("1234567890123456789012345", 110)); |
| 233 CHECK_EQ(1234567890123456789012345e111, |
| 234 StrtodChar("1234567890123456789012345", 111)); |
| 235 CHECK_EQ(1234567890123456789012345e112, |
| 236 StrtodChar("1234567890123456789012345", 112)); |
| 237 CHECK_EQ(1234567890123456789012345e113, |
| 238 StrtodChar("1234567890123456789012345", 113)); |
| 239 CHECK_EQ(1234567890123456789012345e114, |
| 240 StrtodChar("1234567890123456789012345", 114)); |
| 241 CHECK_EQ(1234567890123456789012345e115, |
| 242 StrtodChar("1234567890123456789012345", 115)); |
| 243 |
| 244 CHECK_EQ(1234567890123456789052345e108, |
| 245 StrtodChar("1234567890123456789052345", 108)); |
| 246 CHECK_EQ(1234567890123456789052345e109, |
| 247 StrtodChar("1234567890123456789052345", 109)); |
| 248 CHECK_EQ(1234567890123456789052345e110, |
| 249 StrtodChar("1234567890123456789052345", 110)); |
| 250 CHECK_EQ(1234567890123456789052345e111, |
| 251 StrtodChar("1234567890123456789052345", 111)); |
| 252 CHECK_EQ(1234567890123456789052345e112, |
| 253 StrtodChar("1234567890123456789052345", 112)); |
| 254 CHECK_EQ(1234567890123456789052345e113, |
| 255 StrtodChar("1234567890123456789052345", 113)); |
| 256 CHECK_EQ(1234567890123456789052345e114, |
| 257 StrtodChar("1234567890123456789052345", 114)); |
| 258 CHECK_EQ(1234567890123456789052345e115, |
| 259 StrtodChar("1234567890123456789052345", 115)); |
| 260 |
| 261 CHECK_EQ(5.445618932859895e-255, |
| 262 StrtodChar("5445618932859895362967233318697132813618813095743952975" |
| 263 "4392982234069699615600475529427176366709107287468930197" |
| 264 "8628345413991790019316974825934906752493984055268219809" |
| 265 "5012176093045431437495773903922425632551857520884625114" |
| 266 "6241265881735209066709685420744388526014389929047617597" |
| 267 "0302268848374508109029268898695825171158085457567481507" |
| 268 "4162979705098246243690189880319928315307816832576838178" |
| 269 "2563074014542859888710209237525873301724479666744537857" |
| 270 "9026553346649664045621387124193095870305991178772256504" |
| 271 "4368663670643970181259143319016472430928902201239474588" |
| 272 "1392338901353291306607057623202353588698746085415097902" |
| 273 "6640064319118728664842287477491068264828851624402189317" |
| 274 "2769161449825765517353755844373640588822904791244190695" |
| 275 "2998382932630754670573838138825217065450843010498555058" |
| 276 "88186560731", -1035)); |
| 277 |
| 278 // Boundary cases. Boundaries themselves should round to even. |
| 279 // |
| 280 // 0x1FFFFFFFFFFFF * 2^3 = 72057594037927928 |
| 281 // next: 72057594037927936 |
| 282 // boundary: 72057594037927932 should round up. |
| 283 CHECK_EQ(72057594037927928.0, StrtodChar("72057594037927928", 0)); |
| 284 CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927936", 0)); |
| 285 CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927932", 0)); |
| 286 CHECK_EQ(72057594037927928.0, StrtodChar("7205759403792793199999", -5)); |
| 287 CHECK_EQ(72057594037927936.0, StrtodChar("7205759403792793200001", -5)); |
| 288 |
| 289 // 0x1FFFFFFFFFFFF * 2^10 = 9223372036854774784 |
| 290 // next: 9223372036854775808 |
| 291 // boundary: 9223372036854775296 should round up. |
| 292 CHECK_EQ(9223372036854774784.0, StrtodChar("9223372036854774784", 0)); |
| 293 CHECK_EQ(9223372036854775808.0, StrtodChar("9223372036854775808", 0)); |
| 294 CHECK_EQ(9223372036854775808.0, StrtodChar("9223372036854775296", 0)); |
| 295 CHECK_EQ(9223372036854774784.0, StrtodChar("922337203685477529599999", -5)); |
| 296 CHECK_EQ(9223372036854775808.0, StrtodChar("922337203685477529600001", -5)); |
| 297 |
| 298 // 0x1FFFFFFFFFFFF * 2^50 = 10141204801825834086073718800384 |
| 299 // next: 10141204801825835211973625643008 |
| 300 // boundary: 10141204801825834649023672221696 should round up. |
| 301 CHECK_EQ(10141204801825834086073718800384.0, |
| 302 StrtodChar("10141204801825834086073718800384", 0)); |
| 303 CHECK_EQ(10141204801825835211973625643008.0, |
| 304 StrtodChar("10141204801825835211973625643008", 0)); |
| 305 CHECK_EQ(10141204801825835211973625643008.0, |
| 306 StrtodChar("10141204801825834649023672221696", 0)); |
| 307 CHECK_EQ(10141204801825834086073718800384.0, |
| 308 StrtodChar("1014120480182583464902367222169599999", -5)); |
| 309 CHECK_EQ(10141204801825835211973625643008.0, |
| 310 StrtodChar("1014120480182583464902367222169600001", -5)); |
| 311 |
| 312 // 0x1FFFFFFFFFFFF * 2^99 = 5708990770823838890407843763683279797179383808 |
| 313 // next: 5708990770823839524233143877797980545530986496 |
| 314 // boundary: 5708990770823839207320493820740630171355185152 |
| 315 // The boundary should round up. |
| 316 CHECK_EQ(5708990770823838890407843763683279797179383808.0, |
| 317 StrtodChar("5708990770823838890407843763683279797179383808", 0)); |
| 318 CHECK_EQ(5708990770823839524233143877797980545530986496.0, |
| 319 StrtodChar("5708990770823839524233143877797980545530986496", 0)); |
| 320 CHECK_EQ(5708990770823839524233143877797980545530986496.0, |
| 321 StrtodChar("5708990770823839207320493820740630171355185152", 0)); |
| 322 CHECK_EQ(5708990770823838890407843763683279797179383808.0, |
| 323 StrtodChar("5708990770823839207320493820740630171355185151999", -3)); |
| 324 CHECK_EQ(5708990770823839524233143877797980545530986496.0, |
| 325 StrtodChar("5708990770823839207320493820740630171355185152001", -3)); |
| 326 |
| 327 // The following test-cases got some public attention in early 2011 when they |
| 328 // sent Java and PHP into an infinite loop. |
| 329 CHECK_EQ(2.225073858507201e-308, StrtodChar("22250738585072011", -324)); |
| 330 CHECK_EQ(2.22507385850720138309e-308, |
| 331 StrtodChar("22250738585072011360574097967091319759348195463516456480" |
| 332 "23426109724822222021076945516529523908135087914149158913" |
| 333 "03962110687008643869459464552765720740782062174337998814" |
| 334 "10632673292535522868813721490129811224514518898490572223" |
| 335 "07285255133155755015914397476397983411801999323962548289" |
| 336 "01710708185069063066665599493827577257201576306269066333" |
| 337 "26475653000092458883164330377797918696120494973903778297" |
| 338 "04905051080609940730262937128958950003583799967207254304" |
| 339 "36028407889577179615094551674824347103070260914462157228" |
| 340 "98802581825451803257070188608721131280795122334262883686" |
| 341 "22321503775666622503982534335974568884423900265498198385" |
| 342 "48794829220689472168983109969836584681402285424333066033" |
| 343 "98508864458040010349339704275671864433837704860378616227" |
| 344 "71738545623065874679014086723327636718751", -1076)); |
| 345 } |
| 346 |
| 347 |
| 348 static int CompareBignumToDiyFp(const Bignum& bignum_digits, |
| 349 int bignum_exponent, |
| 350 DiyFp diy_fp) { |
| 351 Bignum bignum; |
| 352 bignum.AssignBignum(bignum_digits); |
| 353 Bignum other; |
| 354 other.AssignUInt64(diy_fp.f()); |
| 355 if (bignum_exponent >= 0) { |
| 356 bignum.MultiplyByPowerOfTen(bignum_exponent); |
| 357 } else { |
| 358 other.MultiplyByPowerOfTen(-bignum_exponent); |
| 359 } |
| 360 if (diy_fp.e() >= 0) { |
| 361 other.ShiftLeft(diy_fp.e()); |
| 362 } else { |
| 363 bignum.ShiftLeft(-diy_fp.e()); |
| 364 } |
| 365 return Bignum::Compare(bignum, other); |
| 366 } |
| 367 |
| 368 |
| 369 static bool CheckDouble(Vector<const char> buffer, |
| 370 int exponent, |
| 371 double to_check) { |
| 372 DiyFp lower_boundary; |
| 373 DiyFp upper_boundary; |
| 374 Bignum input_digits; |
| 375 input_digits.AssignDecimalString(buffer); |
| 376 if (to_check == 0.0) { |
| 377 const double kMinDouble = 4e-324; |
| 378 // Check that the buffer*10^exponent < (0 + kMinDouble)/2. |
| 379 Double d(kMinDouble); |
| 380 d.NormalizedBoundaries(&lower_boundary, &upper_boundary); |
| 381 return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) <= 0; |
| 382 } |
| 383 if (to_check == Double::Infinity()) { |
| 384 const double kMaxDouble = 1.7976931348623157e308; |
| 385 // Check that the buffer*10^exponent >= boundary between kMaxDouble and inf. |
| 386 Double d(kMaxDouble); |
| 387 d.NormalizedBoundaries(&lower_boundary, &upper_boundary); |
| 388 return CompareBignumToDiyFp(input_digits, exponent, upper_boundary) >= 0; |
| 389 } |
| 390 Double d(to_check); |
| 391 d.NormalizedBoundaries(&lower_boundary, &upper_boundary); |
| 392 if ((d.Significand() & 1) == 0) { |
| 393 return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) >= 0 && |
| 394 CompareBignumToDiyFp(input_digits, exponent, upper_boundary) <= 0; |
| 395 } else { |
| 396 return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) > 0 && |
| 397 CompareBignumToDiyFp(input_digits, exponent, upper_boundary) < 0; |
| 398 } |
| 399 } |
| 400 |
| 401 |
| 402 // Copied from v8.cc and adapted to make the function deterministic. |
| 403 static uint32_t DeterministicRandom() { |
| 404 // Random number generator using George Marsaglia's MWC algorithm. |
| 405 static uint32_t hi = 0; |
| 406 static uint32_t lo = 0; |
| 407 |
| 408 // Initialization values don't have any special meaning. (They are the result |
| 409 // of two calls to random().) |
| 410 if (hi == 0) hi = 0xbfe166e7; |
| 411 if (lo == 0) lo = 0x64d1c3c9; |
| 412 |
| 413 // Mix the bits. |
| 414 hi = 36969 * (hi & 0xFFFF) + (hi >> 16); |
| 415 lo = 18273 * (lo & 0xFFFF) + (lo >> 16); |
| 416 return (hi << 16) + (lo & 0xFFFF); |
| 417 } |
| 418 |
| 419 |
| 420 static const int kBufferSize = 1024; |
| 421 static const int kShortStrtodRandomCount = 2; |
| 422 static const int kLargeStrtodRandomCount = 2; |
| 423 |
| 424 TEST(RandomStrtod) { |
| 425 char buffer[kBufferSize]; |
| 426 for (int length = 1; length < 15; length++) { |
| 427 for (int i = 0; i < kShortStrtodRandomCount; ++i) { |
| 428 int pos = 0; |
| 429 for (int j = 0; j < length; ++j) { |
| 430 buffer[pos++] = random() % 10 + '0'; |
| 431 } |
| 432 int exponent = DeterministicRandom() % (25*2 + 1) - 25 - length; |
| 433 buffer[pos] = '\0'; |
| 434 Vector<const char> vector(buffer, pos); |
| 435 double strtod_result = Strtod(vector, exponent); |
| 436 CHECK(CheckDouble(vector, exponent, strtod_result)); |
| 437 } |
| 438 } |
| 439 for (int length = 15; length < 800; length += 2) { |
| 440 for (int i = 0; i < kLargeStrtodRandomCount; ++i) { |
| 441 int pos = 0; |
| 442 for (int j = 0; j < length; ++j) { |
| 443 buffer[pos++] = random() % 10 + '0'; |
| 444 } |
| 445 int exponent = DeterministicRandom() % (308*2 + 1) - 308 - length; |
| 446 buffer[pos] = '\0'; |
| 447 Vector<const char> vector(buffer, pos); |
| 448 double strtod_result = Strtod(vector, exponent); |
| 449 CHECK(CheckDouble(vector, exponent, strtod_result)); |
| 450 } |
| 451 } |
| 452 } |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 8632010:
double-conversion drop. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart