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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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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 #ifndef V8_CACHED_POWERS_H_ | 28 #ifndef V8_CACHED_POWERS_H_ |
29 #define V8_CACHED_POWERS_H_ | 29 #define V8_CACHED_POWERS_H_ |
30 | 30 |
31 #include "diy-fp.h" | 31 #include "diy-fp.h" |
32 | 32 |
33 namespace v8 { | 33 namespace v8 { |
34 namespace internal { | 34 namespace internal { |
35 | 35 |
36 class PowersOfTenCache { | 36 void GetCachedPowerForBinaryExponentRange(int min_exponent, |
37 public: | 37 int max_exponent, |
38 | 38 DiyFp* power, |
39 // Not all powers of ten are cached. The decimal exponent of two neighboring | 39 int* decimal_exponent); |
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 | 40 |
63 } } // namespace v8::internal | 41 } } // namespace v8::internal |
64 | 42 |
65 #endif // V8_CACHED_POWERS_H_ | 43 #endif // V8_CACHED_POWERS_H_ |
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