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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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29 #define V8_CONVERSIONS_H_ | 29 #define V8_CONVERSIONS_H_ |
30 | 30 |
31 namespace v8 { | 31 namespace v8 { |
32 namespace internal { | 32 namespace internal { |
33 | 33 |
34 | 34 |
35 // The fast double-to-(unsigned-)int conversion routine does not guarantee | 35 // The fast double-to-(unsigned-)int conversion routine does not guarantee |
36 // rounding towards zero. | 36 // rounding towards zero. |
37 // The result is unspecified if x is infinite or NaN, or if the rounded | 37 // The result is unspecified if x is infinite or NaN, or if the rounded |
38 // integer value is outside the range of type int. | 38 // integer value is outside the range of type int. |
39 static inline int FastD2I(double x); | 39 static inline int FastD2I(double x) { |
| 40 // The static_cast convertion from double to int used to be slow, but |
| 41 // as new benchmarks show, now it is much faster than lrint(). |
| 42 return static_cast<int>(x); |
| 43 } |
| 44 |
40 static inline unsigned int FastD2UI(double x); | 45 static inline unsigned int FastD2UI(double x); |
41 | 46 |
42 | 47 |
43 static inline double FastI2D(int x) { | 48 static inline double FastI2D(int x) { |
44 // There is no rounding involved in converting an integer to a | 49 // There is no rounding involved in converting an integer to a |
45 // double, so this code should compile to a few instructions without | 50 // double, so this code should compile to a few instructions without |
46 // any FPU pipeline stalls. | 51 // any FPU pipeline stalls. |
47 return static_cast<double>(x); | 52 return static_cast<double>(x); |
48 } | 53 } |
49 | 54 |
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110 // Additional number to string conversions for the number type. | 115 // Additional number to string conversions for the number type. |
111 // The caller is responsible for calling free on the returned pointer. | 116 // The caller is responsible for calling free on the returned pointer. |
112 char* DoubleToFixedCString(double value, int f); | 117 char* DoubleToFixedCString(double value, int f); |
113 char* DoubleToExponentialCString(double value, int f); | 118 char* DoubleToExponentialCString(double value, int f); |
114 char* DoubleToPrecisionCString(double value, int f); | 119 char* DoubleToPrecisionCString(double value, int f); |
115 char* DoubleToRadixCString(double value, int radix); | 120 char* DoubleToRadixCString(double value, int radix); |
116 | 121 |
117 } } // namespace v8::internal | 122 } } // namespace v8::internal |
118 | 123 |
119 #endif // V8_CONVERSIONS_H_ | 124 #endif // V8_CONVERSIONS_H_ |
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