erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include <stdlib.h> |
| 29 | |
| 30 | #include "v8.h" |
| 31 | |
| 32 | #include "bignum-dtoa.h" |
| 33 | |
| 34 | #include "cctest.h" |
| 35 | #include "double.h" |
| 36 | #include "gay-fixed.h" |
| 37 | #include "gay-precision.h" |
| 38 | #include "gay-shortest.h" |
| 39 | #include "platform.h" |
| 40 | |
| 41 | using namespace v8::internal; |
| 42 | |
| 43 | |
| 44 | // Removes trailing '0' digits. |
| 45 | // Can return the empty string if all digits are 0. |
| 46 | static void TrimRepresentation(Vector<char> representation) { |
| 47 | int len = strlen(representation.start()); |
| 48 | int i; |
| 49 | for (i = len - 1; i >= 0; --i) { |
| 50 | if (representation[i] != '0') break; |
| 51 | } |
| 52 | representation[i + 1] = '\0'; |
| 53 | } |
| 54 | |
| 55 | |
| 56 | static const int kBufferSize = 100; |
| 57 | |
| 58 | |
| 59 | TEST(BignumDtoaVariousDoubles) { |
| 60 | char buffer_container[kBufferSize]; |
| 61 | Vector<char> buffer(buffer_container, kBufferSize); |
| 62 | int length; |
| 63 | int point; |
| 64 | |
| 65 | BignumDtoa(1.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 66 | CHECK_EQ("1", buffer.start()); |
| 67 | CHECK_EQ(1, point); |
| 68 | |
| 69 | BignumDtoa(1.0, BIGNUM_DTOA_FIXED, 3, buffer, &length, &point); |
| 70 | CHECK_GE(3, length - point); |
| 71 | TrimRepresentation(buffer); |
| 72 | CHECK_EQ("1", buffer.start()); |
| 73 | CHECK_EQ(1, point); |
| 74 | |
| 75 | BignumDtoa(1.0, BIGNUM_DTOA_PRECISION, 3, buffer, &length, &point); |
| 76 | CHECK_GE(3, length); |
| 77 | TrimRepresentation(buffer); |
| 78 | CHECK_EQ("1", buffer.start()); |
| 79 | CHECK_EQ(1, point); |
| 80 | |
| 81 | BignumDtoa(1.5, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 82 | CHECK_EQ("15", buffer.start()); |
| 83 | CHECK_EQ(1, point); |
| 84 | |
| 85 | BignumDtoa(1.5, BIGNUM_DTOA_FIXED, 10, buffer, &length, &point); |
| 86 | CHECK_GE(10, length - point); |
| 87 | TrimRepresentation(buffer); |
| 88 | CHECK_EQ("15", buffer.start()); |
| 89 | CHECK_EQ(1, point); |
| 90 | |
| 91 | BignumDtoa(1.5, BIGNUM_DTOA_PRECISION, 10, buffer, &length, &point); |
| 92 | CHECK_GE(10, length); |
| 93 | TrimRepresentation(buffer); |
| 94 | CHECK_EQ("15", buffer.start()); |
| 95 | CHECK_EQ(1, point); |
| 96 | |
| 97 | double min_double = 5e-324; |
| 98 | BignumDtoa(min_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 99 | CHECK_EQ("5", buffer.start()); |
| 100 | CHECK_EQ(-323, point); |
| 101 | |
| 102 | BignumDtoa(min_double, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); |
| 103 | CHECK_GE(5, length - point); |
| 104 | TrimRepresentation(buffer); |
| 105 | CHECK_EQ("", buffer.start()); |
| 106 | |
| 107 | BignumDtoa(min_double, BIGNUM_DTOA_PRECISION, 5, buffer, &length, &point); |
| 108 | CHECK_GE(5, length); |
| 109 | TrimRepresentation(buffer); |
| 110 | CHECK_EQ("49407", buffer.start()); |
| 111 | CHECK_EQ(-323, point); |
| 112 | |
| 113 | double max_double = 1.7976931348623157e308; |
| 114 | BignumDtoa(max_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 115 | CHECK_EQ("17976931348623157", buffer.start()); |
| 116 | CHECK_EQ(309, point); |
| 117 | |
| 118 | BignumDtoa(max_double, BIGNUM_DTOA_PRECISION, 7, buffer, &length, &point); |
| 119 | CHECK_GE(7, length); |
| 120 | TrimRepresentation(buffer); |
| 121 | CHECK_EQ("1797693", buffer.start()); |
| 122 | CHECK_EQ(309, point); |
| 123 | |
| 124 | BignumDtoa(4294967272.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 125 | CHECK_EQ("4294967272", buffer.start()); |
| 126 | CHECK_EQ(10, point); |
| 127 | |
| 128 | BignumDtoa(4294967272.0, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); |
| 129 | CHECK_EQ("429496727200000", buffer.start()); |
| 130 | CHECK_EQ(10, point); |
| 131 | |
| 132 | |
| 133 | BignumDtoa(4294967272.0, BIGNUM_DTOA_PRECISION, 14, buffer, &length, &point); |
| 134 | CHECK_GE(14, length); |
| 135 | TrimRepresentation(buffer); |
| 136 | CHECK_EQ("4294967272", buffer.start()); |
| 137 | CHECK_EQ(10, point); |
| 138 | |
| 139 | BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_SHORTEST, 0, |
| 140 | buffer, &length, &point); |
| 141 | CHECK_EQ("4185580496821357", buffer.start()); |
| 142 | CHECK_EQ(299, point); |
| 143 | |
| 144 | BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_PRECISION, 20, |
| 145 | buffer, &length, &point); |
| 146 | CHECK_GE(20, length); |
| 147 | TrimRepresentation(buffer); |
| 148 | CHECK_EQ("41855804968213567225", buffer.start()); |
| 149 | CHECK_EQ(299, point); |
| 150 | |
| 151 | BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_SHORTEST, 0, |
| 152 | buffer, &length, &point); |
| 153 | CHECK_EQ("5562684646268003", buffer.start()); |
| 154 | CHECK_EQ(-308, point); |
| 155 | |
| 156 | BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_PRECISION, 1, |
| 157 | buffer, &length, &point); |
| 158 | CHECK_GE(1, length); |
| 159 | TrimRepresentation(buffer); |
| 160 | CHECK_EQ("6", buffer.start()); |
| 161 | CHECK_EQ(-308, point); |
| 162 | |
| 163 | BignumDtoa(2147483648.0, BIGNUM_DTOA_SHORTEST, 0, |
| 164 | buffer, &length, &point); |
| 165 | CHECK_EQ("2147483648", buffer.start()); |
| 166 | CHECK_EQ(10, point); |
| 167 | |
| 168 | |
| 169 | BignumDtoa(2147483648.0, BIGNUM_DTOA_FIXED, 2, |
| 170 | buffer, &length, &point); |
| 171 | CHECK_GE(2, length - point); |
| 172 | TrimRepresentation(buffer); |
| 173 | CHECK_EQ("2147483648", buffer.start()); |
| 174 | CHECK_EQ(10, point); |
| 175 | |
| 176 | BignumDtoa(2147483648.0, BIGNUM_DTOA_PRECISION, 5, |
| 177 | buffer, &length, &point); |
| 178 | CHECK_GE(5, length); |
| 179 | TrimRepresentation(buffer); |
| 180 | CHECK_EQ("21475", buffer.start()); |
| 181 | CHECK_EQ(10, point); |
| 182 | |
| 183 | BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_SHORTEST, 0, |
| 184 | buffer, &length, &point); |
| 185 | CHECK_EQ("35844466002796428", buffer.start()); |
| 186 | CHECK_EQ(299, point); |
| 187 | |
| 188 | BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_PRECISION, 10, |
| 189 | buffer, &length, &point); |
| 190 | CHECK_GE(10, length); |
| 191 | TrimRepresentation(buffer); |
| 192 | CHECK_EQ("35844466", buffer.start()); |
| 193 | CHECK_EQ(299, point); |
| 194 | |
| 195 | uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000); |
| 196 | double v = Double(smallest_normal64).value(); |
| 197 | BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 198 | CHECK_EQ("22250738585072014", buffer.start()); |
| 199 | CHECK_EQ(-307, point); |
| 200 | |
| 201 | BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point); |
| 202 | CHECK_GE(20, length); |
| 203 | TrimRepresentation(buffer); |
| 204 | CHECK_EQ("22250738585072013831", buffer.start()); |
| 205 | CHECK_EQ(-307, point); |
| 206 | |
| 207 | uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF); |
| 208 | v = Double(largest_denormal64).value(); |
| 209 | BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 210 | CHECK_EQ("2225073858507201", buffer.start()); |
| 211 | CHECK_EQ(-307, point); |
| 212 | |
| 213 | BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point); |
| 214 | CHECK_GE(20, length); |
| 215 | TrimRepresentation(buffer); |
| 216 | CHECK_EQ("2225073858507200889", buffer.start()); |
| 217 | CHECK_EQ(-307, point); |
| 218 | |
| 219 | BignumDtoa(4128420500802942e-24, BIGNUM_DTOA_SHORTEST, 0, |
| 220 | buffer, &length, &point); |
| 221 | CHECK_EQ("4128420500802942", buffer.start()); |
| 222 | CHECK_EQ(-8, point); |
| 223 | |
| 224 | v = 3.9292015898194142585311918e-10; |
| 225 | BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 226 | CHECK_EQ("39292015898194143", buffer.start()); |
| 227 | |
| 228 | v = 4194304.0; |
| 229 | BignumDtoa(v, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); |
| 230 | CHECK_GE(5, length - point); |
| 231 | TrimRepresentation(buffer); |
| 232 | CHECK_EQ("4194304", buffer.start()); |
| 233 | |
| 234 | v = 3.3161339052167390562200598e-237; |
| 235 | BignumDtoa(v, BIGNUM_DTOA_PRECISION, 19, buffer, &length, &point); |
| 236 | CHECK_GE(19, length); |
| 237 | TrimRepresentation(buffer); |
| 238 | CHECK_EQ("3316133905216739056", buffer.start()); |
| 239 | CHECK_EQ(-236, point); |
| 240 | |
| 241 | v = 7.9885183916008099497815232e+191; |
| 242 | BignumDtoa(v, BIGNUM_DTOA_PRECISION, 4, buffer, &length, &point); |
| 243 | CHECK_GE(4, length); |
| 244 | TrimRepresentation(buffer); |
| 245 | CHECK_EQ("7989", buffer.start()); |
| 246 | CHECK_EQ(192, point); |
| 247 | |
| 248 | v = 1.0000000000000012800000000e+17; |
| 249 | BignumDtoa(v, BIGNUM_DTOA_FIXED, 1, buffer, &length, &point); |
| 250 | CHECK_GE(1, length - point); |
| 251 | TrimRepresentation(buffer); |
| 252 | CHECK_EQ("100000000000000128", buffer.start()); |
| 253 | CHECK_EQ(18, point); |
| 254 | } |
| 255 | |
| 256 | |
| 257 | TEST(BignumDtoaGayShortest) { |
| 258 | char buffer_container[kBufferSize]; |
| 259 | Vector<char> buffer(buffer_container, kBufferSize); |
| 260 | int length; |
| 261 | int point; |
| 262 | |
| 263 | Vector<const PrecomputedShortest> precomputed = |
| 264 | PrecomputedShortestRepresentations(); |
| 265 | for (int i = 0; i < precomputed.length(); ++i) { |
| 266 | const PrecomputedShortest current_test = precomputed[i]; |
| 267 | double v = current_test.v; |
| 268 | BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); |
| 269 | CHECK_EQ(current_test.decimal_point, point); |
| 270 | CHECK_EQ(current_test.representation, buffer.start()); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | |
| 275 | TEST(BignumDtoaGayFixed) { |
| 276 | char buffer_container[kBufferSize]; |
| 277 | Vector<char> buffer(buffer_container, kBufferSize); |
| 278 | int length; |
| 279 | int point; |
| 280 | |
| 281 | Vector<const PrecomputedFixed> precomputed = |
| 282 | PrecomputedFixedRepresentations(); |
| 283 | for (int i = 0; i < precomputed.length(); ++i) { |
| 284 | const PrecomputedFixed current_test = precomputed[i]; |
| 285 | double v = current_test.v; |
| 286 | int number_digits = current_test.number_digits; |
| 287 | BignumDtoa(v, BIGNUM_DTOA_FIXED, number_digits, buffer, &length, &point); |
| 288 | CHECK_EQ(current_test.decimal_point, point); |
| 289 | CHECK_GE(number_digits, length - point); |
| 290 | TrimRepresentation(buffer); |
| 291 | CHECK_EQ(current_test.representation, buffer.start()); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | |
| 296 | TEST(BignumDtoaGayPrecision) { |
| 297 | char buffer_container[kBufferSize]; |
| 298 | Vector<char> buffer(buffer_container, kBufferSize); |
| 299 | int length; |
| 300 | int point; |
| 301 | |
| 302 | Vector<const PrecomputedPrecision> precomputed = |
| 303 | PrecomputedPrecisionRepresentations(); |
| 304 | for (int i = 0; i < precomputed.length(); ++i) { |
| 305 | const PrecomputedPrecision current_test = precomputed[i]; |
| 306 | double v = current_test.v; |
| 307 | int number_digits = current_test.number_digits; |
| 308 | BignumDtoa(v, BIGNUM_DTOA_PRECISION, number_digits, |
| 309 | buffer, &length, &point); |
| 310 | CHECK_EQ(current_test.decimal_point, point); |
| 311 | CHECK_GE(number_digits, length); |
| 312 | TrimRepresentation(buffer); |
| 313 | CHECK_EQ(current_test.representation, buffer.start()); |
| 314 | } |
| 315 | } |