LCOV - code coverage report
Current view: directory - js/src - jslibmath.h (source / functions) Found Hit Coverage
Test: app.info Lines: 10 10 100.0 %
Date: 2012-06-02 Functions: 2 2 100.0 %

       1                 : /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * vim: set ts=4 sw=4 et tw=79:
       3                 :  *
       4                 :  * ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is Mozilla Communicator client code, released
      18                 :  * March 31, 1998.
      19                 :  *
      20                 :  * The Initial Developer of the Original Code is
      21                 :  * Netscape Communications Corporation.
      22                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      23                 :  * the Initial Developer. All Rights Reserved.
      24                 :  *
      25                 :  * Contributor(s):
      26                 :  *   IBM Corp.
      27                 :  *
      28                 :  * Alternatively, the contents of this file may be used under the terms of
      29                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      30                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      31                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      32                 :  * of those above. If you wish to allow use of your version of this file only
      33                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      34                 :  * use your version of this file under the terms of the MPL, indicate your
      35                 :  * decision by deleting the provisions above and replace them with the notice
      36                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      37                 :  * the provisions above, a recipient may use your version of this file under
      38                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      39                 :  *
      40                 :  * ***** END LICENSE BLOCK ***** */
      41                 : 
      42                 : #ifndef _LIBMATH_H
      43                 : #define _LIBMATH_H
      44                 : 
      45                 : #include <math.h>
      46                 : #include "jsnum.h"
      47                 : 
      48                 : /*
      49                 :  * Use system provided math routines.
      50                 :  */
      51                 : 
      52                 : /* The right copysign function is not always named the same thing. */
      53                 : #if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
      54                 : #define js_copysign __builtin_copysign
      55                 : #elif defined _WIN32
      56                 : #if _MSC_VER < 1400
      57                 : /* Try to work around apparent _copysign bustage in VC7.x. */
      58                 : #define js_copysign js_copysign
      59                 : extern double js_copysign(double, double);
      60                 : #else
      61                 : #define js_copysign _copysign
      62                 : #endif
      63                 : #else
      64                 : #define js_copysign copysign
      65                 : #endif
      66                 : 
      67                 : #if defined(_M_X64) && defined(_MSC_VER) && _MSC_VER <= 1500
      68                 : // This is a workaround for fmod bug (http://support.microsoft.com/kb/982107)
      69                 : extern "C" double js_myfmod(double x, double y);
      70                 : #define fmod js_myfmod
      71                 : #endif
      72                 : 
      73                 : /* Consistency wrapper for platform deviations in fmod() */
      74                 : static inline double
      75           40576 : js_fmod(double d, double d2)
      76                 : {
      77                 : #ifdef XP_WIN
      78                 :     /*
      79                 :      * Workaround MS fmod bug where 42 % (1/0) => NaN, not 42.
      80                 :      * Workaround MS fmod bug where -0 % -N => 0, not -0.
      81                 :      */
      82                 :     if ((JSDOUBLE_IS_FINITE(d) && JSDOUBLE_IS_INFINITE(d2)) ||
      83                 :         (d == 0 && JSDOUBLE_IS_FINITE(d2))) {
      84                 :         return d;
      85                 :     }
      86                 : #endif
      87           40576 :     return fmod(d, d2);
      88                 : }
      89                 : 
      90                 : namespace js {
      91                 : 
      92                 : inline double
      93         1396642 : NumberDiv(double a, double b) {
      94         1396642 :     if (b == 0) {
      95            1395 :         if (a == 0 || JSDOUBLE_IS_NaN(a) 
      96                 : #ifdef XP_WIN
      97                 :             || JSDOUBLE_IS_NaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */
      98                 : #endif
      99                 :         )
     100              17 :             return js_NaN;    
     101                 : 
     102            1378 :         if (JSDOUBLE_IS_NEG(a) != JSDOUBLE_IS_NEG(b))
     103             491 :             return js_NegativeInfinity;
     104             887 :         return js_PositiveInfinity; 
     105                 :     }
     106                 : 
     107         1395247 :     return a / b;
     108                 : }
     109                 : 
     110                 : }
     111                 : 
     112                 : #endif /* _LIBMATH_H */
     113                 : 

Generated by: LCOV version 1.7