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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // modification, are permitted provided that the following conditions are | 3 // found in the LICENSE file. |
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 | 4 |
28 #ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_ | 5 #include "platform/wtf/dtoa/cached-powers.h" |
29 #define DOUBLE_CONVERSION_CACHED_POWERS_H_ | |
30 | 6 |
31 #include "diy-fp.h" | 7 // The contents of this header was moved to platform/wtf as part of |
32 | 8 // WTF migration project. See the following post for details: |
33 namespace WTF { | 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY
CAAJ |
34 | |
35 namespace double_conversion { | |
36 | |
37 class PowersOfTenCache { | |
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; | |
42 | |
43 static const int kMinDecimalExponent; | |
44 static const int kMaxDecimalExponent; | |
45 | |
46 // Returns a cached power-of-ten with a binary exponent in the range | |
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); | |
52 | |
53 // Returns a cached power of ten x ~= 10^k such that | |
54 // k <= decimal_exponent < k + kCachedPowersDecimalDistance. | |
55 // The given decimal_exponent must satisfy | |
56 // kMinDecimalExponent <= requested_exponent, and | |
57 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. | |
58 static void GetCachedPowerForDecimalExponent(int requested_exponent, | |
59 DiyFp* power, | |
60 int* found_exponent); | |
61 }; | |
62 } // namespace double_conversion | |
63 | |
64 } // namespace WTF | |
65 | |
66 #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ | |
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