js/src/fdlibm/w_gamma_r.c

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  16  * The Original Code is Mozilla Communicator client code, released
  17  * March 31, 1998.
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  21  * Portions created by the Initial Developer are Copyright (C) 1998
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  39
  40 /* @(#)w_gamma_r.c 1.3 95/01/18 */
  41 /*
  42  * ====================================================
  43  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  44  *
  45  * Developed at SunSoft, a Sun Microsystems, Inc. business.
  46  * Permission to use, copy, modify, and distribute this
  47  * software is freely granted, provided that this notice
  48  * is preserved.
  49  * ====================================================
  50  */
  51
  52 /*
  53  * wrapper double gamma_r(double x, int *signgamp)
  54  */
  55
  56 #include "fdlibm.h"
  57
  58
  59 #ifdef __STDC__
  60         double fd_gamma_r(double x, int *signgamp) /* wrapper lgamma_r */
  61 #else
  62         double fd_gamma_r(x,signgamp)              /* wrapper lgamma_r */
  63         double x; int *signgamp;
  64 #endif
  65 {
  66 #ifdef _IEEE_LIBM
  67         return __ieee754_gamma_r(x,signgamp);
  68 #else
  69         double y;
  70         y = __ieee754_gamma_r(x,signgamp);
  71         if(_LIB_VERSION == _IEEE_) return y;
  72         if(!fd_finite(y)&&fd_finite(x)) {
  73             int err;
  74             if(fd_floor(x)==x&&x<=0.0)
  75                 return __kernel_standard(x,x,41,&err); /* gamma pole */
  76             else
  77                 return __kernel_standard(x,x,40,&err); /* gamma overflow */
  78         } else
  79             return y;
  80 #endif
  81 }