| // Copyright 2010 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_ |
| #define DOUBLE_CONVERSION_CACHED_POWERS_H_ |
| |
| #include "diy-fp.h" |
| |
| namespace WTF { |
| |
| namespace double_conversion { |
| |
| class PowersOfTenCache { |
| public: |
| |
| // Not all powers of ten are cached. The decimal exponent of two neighboring |
| // cached numbers will differ by kDecimalExponentDistance. |
| static const int kDecimalExponentDistance; |
| |
| static const int kMinDecimalExponent; |
| static const int kMaxDecimalExponent; |
| |
| // Returns a cached power-of-ten with a binary exponent in the range |
| // [min_exponent; max_exponent] (boundaries included). |
| static void GetCachedPowerForBinaryExponentRange(int min_exponent, |
| int max_exponent, |
| DiyFp* power, |
| int* decimal_exponent); |
| |
| // Returns a cached power of ten x ~= 10^k such that |
| // k <= decimal_exponent < k + kCachedPowersDecimalDistance. |
| // The given decimal_exponent must satisfy |
| // kMinDecimalExponent <= requested_exponent, and |
| // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. |
| static void GetCachedPowerForDecimalExponent(int requested_exponent, |
| DiyFp* power, |
| int* found_exponent); |
| }; |
| |
| } // namespace double_conversion |
| |
| } // namespace WTF |
| |
| #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ |
