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comparison: mfbt/double-conversion/cached-powers.h
mfbt/double-conversion/cached-powers.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:68753843ba86 |
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| 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 #ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_ | |
| 29 #define DOUBLE_CONVERSION_CACHED_POWERS_H_ | |
| 30 | |
| 31 #include "diy-fp.h" | |
| 32 | |
| 33 namespace double_conversion { | |
| 34 | |
| 35 class PowersOfTenCache { | |
| 36 public: | |
| 37 | |
| 38 // Not all powers of ten are cached. The decimal exponent of two neighboring | |
| 39 // cached numbers will differ by kDecimalExponentDistance. | |
| 40 static const int kDecimalExponentDistance; | |
| 41 | |
| 42 static const int kMinDecimalExponent; | |
| 43 static const int kMaxDecimalExponent; | |
| 44 | |
| 45 // Returns a cached power-of-ten with a binary exponent in the range | |
| 46 // [min_exponent; max_exponent] (boundaries included). | |
| 47 static void GetCachedPowerForBinaryExponentRange(int min_exponent, | |
| 48 int max_exponent, | |
| 49 DiyFp* power, | |
| 50 int* decimal_exponent); | |
| 51 | |
| 52 // Returns a cached power of ten x ~= 10^k such that | |
| 53 // k <= decimal_exponent < k + kCachedPowersDecimalDistance. | |
| 54 // The given decimal_exponent must satisfy | |
| 55 // kMinDecimalExponent <= requested_exponent, and | |
| 56 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. | |
| 57 static void GetCachedPowerForDecimalExponent(int requested_exponent, | |
| 58 DiyFp* power, | |
| 59 int* found_exponent); | |
| 60 }; | |
| 61 | |
| 62 } // namespace double_conversion | |
| 63 | |
| 64 #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ |
