Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 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 | |
| 28 | // Extra POSIX/ANSI routines for Win32 when using Visual Studio C++. Please |
| 29 | // refer to The Open Group Base Specification for specification of the correct |
| 30 | // semantics for these functions. |
| 31 | // (http://www.opengroup.org/onlinepubs/000095399/) |
| 32 | #ifdef _MSC_VER |
| 33 | |
| 34 | #undef V8_WIN32_LEAN_AND_MEAN |
| 35 | #define V8_WIN32_HEADERS_FULL |
| 36 | #include "win32-headers.h" |
| 37 | #include <limits.h> // Required for INT_MAX etc. |
| 38 | #include <math.h> |
| 39 | #include <float.h> // Required for DBL_MAX and on Win32 for finite() |
| 40 | #include "win32-math.h" |
| 41 | |
| 42 | #include "checks.h" |
| 43 | |
| 44 | namespace v8 { |
| 45 | |
| 46 | // Test for finite value - usually defined in math.h |
| 47 | int isfinite(double x) { |
| 48 | return _finite(x); |
| 49 | } |
| 50 | |
| 51 | } // namespace v8 |
| 52 | |
| 53 | |
| 54 | // Test for a NaN (not a number) value - usually defined in math.h |
| 55 | int isnan(double x) { |
| 56 | return _isnan(x); |
| 57 | } |
| 58 | |
| 59 | |
| 60 | // Test for infinity - usually defined in math.h |
| 61 | int isinf(double x) { |
| 62 | return (_fpclass(x) & (_FPCLASS_PINF | _FPCLASS_NINF)) != 0; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | // Test if x is less than y and both nominal - usually defined in math.h |
| 67 | int isless(double x, double y) { |
| 68 | return isnan(x) || isnan(y) ? 0 : x < y; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | // Test if x is greater than y and both nominal - usually defined in math.h |
| 73 | int isgreater(double x, double y) { |
| 74 | return isnan(x) || isnan(y) ? 0 : x > y; |
| 75 | } |
| 76 | |
| 77 | |
| 78 | // Classify floating point number - usually defined in math.h |
| 79 | int fpclassify(double x) { |
| 80 | // Use the MS-specific _fpclass() for classification. |
| 81 | int flags = _fpclass(x); |
| 82 | |
| 83 | // Determine class. We cannot use a switch statement because |
| 84 | // the _FPCLASS_ constants are defined as flags. |
| 85 | if (flags & (_FPCLASS_PN | _FPCLASS_NN)) return FP_NORMAL; |
| 86 | if (flags & (_FPCLASS_PZ | _FPCLASS_NZ)) return FP_ZERO; |
| 87 | if (flags & (_FPCLASS_PD | _FPCLASS_ND)) return FP_SUBNORMAL; |
| 88 | if (flags & (_FPCLASS_PINF | _FPCLASS_NINF)) return FP_INFINITE; |
| 89 | |
| 90 | // All cases should be covered by the code above. |
| 91 | ASSERT(flags & (_FPCLASS_SNAN | _FPCLASS_QNAN)); |
| 92 | return FP_NAN; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | // Test sign - usually defined in math.h |
| 97 | int signbit(double x) { |
| 98 | // We need to take care of the special case of both positive |
| 99 | // and negative versions of zero. |
| 100 | if (x == 0) |
| 101 | return _fpclass(x) & _FPCLASS_NZ; |
| 102 | else |
| 103 | return x < 0; |
| 104 | } |
| 105 | |
| 106 | #endif // _MSC_VER |