math/w_lgamma_r.c

   1 /* @(#)wr_lgamma.c 5.1 93/09/24 */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  */
  12
  13 /*
  14  * wrapper double lgamma_r(double x, int *signgamp)
  15  */
  16
  17 #include <math.h>
  18 #include <math_private.h>
  19
  20
  21 double
  22 __lgamma_r(double x, int *signgamp)
  23 {
  24         double y = __ieee754_lgamma_r(x,signgamp);
  25         if(__builtin_expect(!isfinite(y), 0)
  26            && isfinite(x) && _LIB_VERSION != _IEEE_)
  27                 return __kernel_standard(x, x,
  28                                          __floor(x)==x&&x<=0.0
  29                                          ? 15 /* lgamma pole */
  30                                          : 14); /* lgamma overflow */
  31
  32         return y;
  33 }
  34 weak_alias (__lgamma_r, lgamma_r)
  35 #ifdef NO_LONG_DOUBLE
  36 strong_alias (__lgamma_r, __lgammal_r)
  37 weak_alias (__lgamma_r, lgammal_r)
  38 #endif