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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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52 } | 52 } |
53 | 53 |
54 | 54 |
55 inline double SignedZero(bool negative) { | 55 inline double SignedZero(bool negative) { |
56 return negative ? -0.0 : 0.0; | 56 return negative ? -0.0 : 0.0; |
57 } | 57 } |
58 | 58 |
59 | 59 |
60 // The fast double-to-(unsigned-)int conversion routine does not guarantee | 60 // The fast double-to-(unsigned-)int conversion routine does not guarantee |
61 // rounding towards zero. | 61 // rounding towards zero. |
| 62 // For NaN and values outside the int range, return INT_MIN or INT_MAX. |
| 63 inline int FastD2IChecked(double x) { |
| 64 if (!(x >= INT_MIN)) return INT_MIN; // Negation to catch NaNs. |
| 65 if (x > INT_MAX) return INT_MAX; |
| 66 return static_cast<int>(x); |
| 67 } |
| 68 |
| 69 |
| 70 // The fast double-to-(unsigned-)int conversion routine does not guarantee |
| 71 // rounding towards zero. |
62 // The result is unspecified if x is infinite or NaN, or if the rounded | 72 // The result is unspecified if x is infinite or NaN, or if the rounded |
63 // integer value is outside the range of type int. | 73 // integer value is outside the range of type int. |
64 inline int FastD2I(double x) { | 74 inline int FastD2I(double x) { |
65 // The static_cast convertion from double to int used to be slow, but | |
66 // as new benchmarks show, now it is much faster than lrint(). | |
67 return static_cast<int>(x); | 75 return static_cast<int>(x); |
68 } | 76 } |
69 | 77 |
| 78 |
70 inline unsigned int FastD2UI(double x); | 79 inline unsigned int FastD2UI(double x); |
71 | 80 |
72 | 81 |
73 inline double FastI2D(int x) { | 82 inline double FastI2D(int x) { |
74 // There is no rounding involved in converting an integer to a | 83 // There is no rounding involved in converting an integer to a |
75 // double, so this code should compile to a few instructions without | 84 // double, so this code should compile to a few instructions without |
76 // any FPU pipeline stalls. | 85 // any FPU pipeline stalls. |
77 return static_cast<double>(x); | 86 return static_cast<double>(x); |
78 } | 87 } |
79 | 88 |
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139 // Additional number to string conversions for the number type. | 148 // Additional number to string conversions for the number type. |
140 // The caller is responsible for calling free on the returned pointer. | 149 // The caller is responsible for calling free on the returned pointer. |
141 char* DoubleToFixedCString(double value, int f); | 150 char* DoubleToFixedCString(double value, int f); |
142 char* DoubleToExponentialCString(double value, int f); | 151 char* DoubleToExponentialCString(double value, int f); |
143 char* DoubleToPrecisionCString(double value, int f); | 152 char* DoubleToPrecisionCString(double value, int f); |
144 char* DoubleToRadixCString(double value, int radix); | 153 char* DoubleToRadixCString(double value, int radix); |
145 | 154 |
146 } } // namespace v8::internal | 155 } } // namespace v8::internal |
147 | 156 |
148 #endif // V8_CONVERSIONS_H_ | 157 #endif // V8_CONVERSIONS_H_ |
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