math/w_lgammaf.c

   1 /* w_lgammaf.c -- float version of w_lgamma.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #include <math.h>
  17 #include <math_private.h>
  18
  19 float
  20 __lgammaf(float x)
  21 {
  22         int local_signgam = 0;
  23         float y = __ieee754_lgammaf_r(x,
  24                                       _LIB_VERSION != _ISOC_
  25                                       /* ISO C99 does not define the
  26                                          global variable.  */
  27                                       ? &signgam
  28                                       : &local_signgam);
  29         if(__builtin_expect(!isfinite(y), 0)
  30            && isfinite(x) && _LIB_VERSION != _IEEE_)
  31                 return __kernel_standard_f(x, x,
  32                                            __floorf(x)==x&&x<=0.0f
  33                                            ? 115 /* lgamma pole */
  34                                            : 114); /* lgamma overflow */
  35
  36         return y;
  37 }
  38 weak_alias (__lgammaf, lgammaf)
  39 strong_alias (__lgammaf, __gammaf)
  40 weak_alias (__gammaf, gammaf)