1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/double-conversion/cached-powers.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,64 @@
1.4 +// Copyright 2010 the V8 project authors. All rights reserved.
1.5 +// Redistribution and use in source and binary forms, with or without
1.6 +// modification, are permitted provided that the following conditions are
1.7 +// met:
1.8 +//
1.9 +// * Redistributions of source code must retain the above copyright
1.10 +// notice, this list of conditions and the following disclaimer.
1.11 +// * Redistributions in binary form must reproduce the above
1.12 +// copyright notice, this list of conditions and the following
1.13 +// disclaimer in the documentation and/or other materials provided
1.14 +// with the distribution.
1.15 +// * Neither the name of Google Inc. nor the names of its
1.16 +// contributors may be used to endorse or promote products derived
1.17 +// from this software without specific prior written permission.
1.18 +//
1.19 +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.20 +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.21 +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.22 +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
1.23 +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1.24 +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1.25 +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.26 +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.27 +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.28 +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.29 +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.30 +
1.31 +#ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_
1.32 +#define DOUBLE_CONVERSION_CACHED_POWERS_H_
1.33 +
1.34 +#include "diy-fp.h"
1.35 +
1.36 +namespace double_conversion {
1.37 +
1.38 +class PowersOfTenCache {
1.39 + public:
1.40 +
1.41 + // Not all powers of ten are cached. The decimal exponent of two neighboring
1.42 + // cached numbers will differ by kDecimalExponentDistance.
1.43 + static const int kDecimalExponentDistance;
1.44 +
1.45 + static const int kMinDecimalExponent;
1.46 + static const int kMaxDecimalExponent;
1.47 +
1.48 + // Returns a cached power-of-ten with a binary exponent in the range
1.49 + // [min_exponent; max_exponent] (boundaries included).
1.50 + static void GetCachedPowerForBinaryExponentRange(int min_exponent,
1.51 + int max_exponent,
1.52 + DiyFp* power,
1.53 + int* decimal_exponent);
1.54 +
1.55 + // Returns a cached power of ten x ~= 10^k such that
1.56 + // k <= decimal_exponent < k + kCachedPowersDecimalDistance.
1.57 + // The given decimal_exponent must satisfy
1.58 + // kMinDecimalExponent <= requested_exponent, and
1.59 + // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
1.60 + static void GetCachedPowerForDecimalExponent(int requested_exponent,
1.61 + DiyFp* power,
1.62 + int* found_exponent);
1.63 +};
1.64 +
1.65 +} // namespace double_conversion
1.66 +
1.67 +#endif // DOUBLE_CONVERSION_CACHED_POWERS_H_
