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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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168 int exponent = 0; | 168 int exponent = 0; |
169 *result = DiyFp(significand, exponent); | 169 *result = DiyFp(significand, exponent); |
170 *remaining_decimals = buffer.length() - read_digits; | 170 *remaining_decimals = buffer.length() - read_digits; |
171 } | 171 } |
172 } | 172 } |
173 | 173 |
174 | 174 |
175 static bool DoubleStrtod(Vector<const char> trimmed, | 175 static bool DoubleStrtod(Vector<const char> trimmed, |
176 int exponent, | 176 int exponent, |
177 double* result) { | 177 double* result) { |
178 #if (V8_TARGET_ARCH_IA32 || defined(USE_SIMULATOR)) \ | 178 #if (V8_TARGET_ARCH_IA32 || defined(USE_SIMULATOR)) && !defined(_MSC_VER) |
179 && !defined(_MSC_VER) | |
180 // On x86 the floating-point stack can be 64 or 80 bits wide. If it is | 179 // On x86 the floating-point stack can be 64 or 80 bits wide. If it is |
181 // 80 bits wide (as is the case on Linux) then double-rounding occurs and the | 180 // 80 bits wide (as is the case on Linux) then double-rounding occurs and the |
182 // result is not accurate. | 181 // result is not accurate. |
183 // We know that Windows32 with MSVC, unlike with MinGW32, uses 64 bits and is | 182 // We know that Windows32 with MSVC, unlike with MinGW32, uses 64 bits and is |
184 // therefore accurate. | 183 // therefore accurate. |
185 // Note that the ARM and MIPS simulators are compiled for 32bits. They | 184 // Note that the ARM and MIPS simulators are compiled for 32bits. They |
186 // therefore exhibit the same problem. | 185 // therefore exhibit the same problem. |
187 return false; | 186 return false; |
188 #endif | 187 #endif |
189 if (trimmed.length() <= kMaxExactDoubleIntegerDecimalDigits) { | 188 if (trimmed.length() <= kMaxExactDoubleIntegerDecimalDigits) { |
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433 | 432 |
434 double guess; | 433 double guess; |
435 if (DoubleStrtod(trimmed, exponent, &guess) || | 434 if (DoubleStrtod(trimmed, exponent, &guess) || |
436 DiyFpStrtod(trimmed, exponent, &guess)) { | 435 DiyFpStrtod(trimmed, exponent, &guess)) { |
437 return guess; | 436 return guess; |
438 } | 437 } |
439 return BignumStrtod(trimmed, exponent, guess); | 438 return BignumStrtod(trimmed, exponent, guess); |
440 } | 439 } |
441 | 440 |
442 } } // namespace v8::internal | 441 } } // namespace v8::internal |
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