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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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31 #include <math.h> | 31 #include <math.h> |
32 #include <float.h> // required for DBL_MAX and on Win32 for finite() | 32 #include <float.h> // required for DBL_MAX and on Win32 for finite() |
33 #include <stdarg.h> | 33 #include <stdarg.h> |
34 | 34 |
35 // ---------------------------------------------------------------------------- | 35 // ---------------------------------------------------------------------------- |
36 // Extra POSIX/ANSI functions for Win32/MSVC. | 36 // Extra POSIX/ANSI functions for Win32/MSVC. |
37 | 37 |
38 #include "conversions.h" | 38 #include "conversions.h" |
39 #include "platform.h" | 39 #include "platform.h" |
40 | 40 |
41 namespace v8 { namespace internal { | 41 namespace v8 { |
| 42 namespace internal { |
42 | 43 |
43 // The fast double-to-int conversion routine does not guarantee | 44 // The fast double-to-int conversion routine does not guarantee |
44 // rounding towards zero. | 45 // rounding towards zero. |
45 static inline int FastD2I(double x) { | 46 static inline int FastD2I(double x) { |
46 #ifdef __USE_ISOC99 | 47 #ifdef __USE_ISOC99 |
47 // The ISO C99 standard defines the lrint() function which rounds a | 48 // The ISO C99 standard defines the lrint() function which rounds a |
48 // double to an integer according to the current rounding direction. | 49 // double to an integer according to the current rounding direction. |
49 return lrint(x); | 50 return lrint(x); |
50 #else | 51 #else |
51 // This is incredibly slow on Intel x86. The reason is that rounding | 52 // This is incredibly slow on Intel x86. The reason is that rounding |
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85 if (!isfinite(x) || x == 0) return 0; | 86 if (!isfinite(x) || x == 0) return 0; |
86 if (x < 0 || x >= two32) x = fmod(x, two32); | 87 if (x < 0 || x >= two32) x = fmod(x, two32); |
87 x = (x >= 0) ? floor(x) : ceil(x) + two32; | 88 x = (x >= 0) ? floor(x) : ceil(x) + two32; |
88 return (int32_t) ((x >= two31) ? x - two32 : x); | 89 return (int32_t) ((x >= two31) ? x - two32 : x); |
89 } | 90 } |
90 | 91 |
91 | 92 |
92 } } // namespace v8::internal | 93 } } // namespace v8::internal |
93 | 94 |
94 #endif // V8_CONVERSIONS_INL_H_ | 95 #endif // V8_CONVERSIONS_INL_H_ |
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