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| 1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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| 27 | 27 |
| 28 #ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_ | 28 #ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_ |
| 29 #define DOUBLE_CONVERSION_CACHED_POWERS_H_ | 29 #define DOUBLE_CONVERSION_CACHED_POWERS_H_ |
| 30 | 30 |
| 31 #include "diy-fp.h" | 31 #include "diy-fp.h" |
| 32 | 32 |
| 33 namespace WTF { | 33 namespace WTF { |
| 34 | 34 |
| 35 namespace double_conversion { | 35 namespace double_conversion { |
| 36 | 36 |
| 37 class PowersOfTenCache { | 37 class PowersOfTenCache { |
| 38 public: | 38 public: |
| 39 // Not all powers of ten are cached. The decimal exponent of two neighboring |
| 40 // cached numbers will differ by kDecimalExponentDistance. |
| 41 static const int kDecimalExponentDistance; |
| 39 | 42 |
| 40 // Not all powers of ten are cached. The decimal exponent of two neighbo
ring | 43 static const int kMinDecimalExponent; |
| 41 // cached numbers will differ by kDecimalExponentDistance. | 44 static const int kMaxDecimalExponent; |
| 42 static const int kDecimalExponentDistance; | |
| 43 | 45 |
| 44 static const int kMinDecimalExponent; | 46 // Returns a cached power-of-ten with a binary exponent in the range |
| 45 static const int kMaxDecimalExponent; | 47 // [min_exponent; max_exponent] (boundaries included). |
| 48 static void GetCachedPowerForBinaryExponentRange(int min_exponent, |
| 49 int max_exponent, |
| 50 DiyFp* power, |
| 51 int* decimal_exponent); |
| 46 | 52 |
| 47 // Returns a cached power-of-ten with a binary exponent in the range | 53 // Returns a cached power of ten x ~= 10^k such that |
| 48 // [min_exponent; max_exponent] (boundaries included). | 54 // k <= decimal_exponent < k + kCachedPowersDecimalDistance. |
| 49 static void GetCachedPowerForBinaryExponentRange(int min_exponent, | 55 // The given decimal_exponent must satisfy |
| 50 int max_exponent, | 56 // kMinDecimalExponent <= requested_exponent, and |
| 51 DiyFp* power, | 57 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. |
| 52 int* decimal_exponent); | 58 static void GetCachedPowerForDecimalExponent(int requested_exponent, |
| 53 | 59 DiyFp* power, |
| 54 // Returns a cached power of ten x ~= 10^k such that | 60 int* found_exponent); |
| 55 // k <= decimal_exponent < k + kCachedPowersDecimalDistance. | 61 }; |
| 56 // The given decimal_exponent must satisfy | |
| 57 // kMinDecimalExponent <= requested_exponent, and | |
| 58 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance
. | |
| 59 static void GetCachedPowerForDecimalExponent(int requested_exponent, | |
| 60 DiyFp* power, | |
| 61 int* found_exponent); | |
| 62 }; | |
| 63 } // namespace double_conversion | 62 } // namespace double_conversion |
| 64 | 63 |
| 65 } // namespace WTF | 64 } // namespace WTF |
| 66 | 65 |
| 67 #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ | 66 #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ |
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