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  1. /* w_gammaf.c -- float version of w_gamma.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 "fdlibm.h"
  18.  
  19. #ifdef __STDC__
  20.         float tgammaf(float x)
  21. #else
  22.         float tgammaf(x)
  23.         float x;
  24. #endif
  25. {
  26.         float y;
  27.         int local_signgam;
  28.         y = __ieee754_gammaf_r(x,&local_signgam);
  29.         if (local_signgam < 0) y = -y;
  30. #ifdef _IEEE_LIBM
  31.         return y;
  32. #else
  33.         if(_LIB_VERSION == _IEEE_) return y;
  34.  
  35.         if(!finitef(y)&&finitef(x)) {
  36.           if(floorf(x)==x&&x<=(float)0.0)
  37.             /* tgammaf pole */
  38.             return (float)__kernel_standard((double)x,(double)x,141);
  39.           else
  40.             /* tgammaf overflow */
  41.             return (float)__kernel_standard((double)x,(double)x,140);
  42.         }
  43.         return y;
  44. #endif
  45. }
  46.  
  47. #ifdef _DOUBLE_IS_32BITS
  48.  
  49. #ifdef __STDC__
  50.         double tgamma(double x)
  51. #else
  52.         double tgamma(x)
  53.         double x;
  54. #endif
  55. {
  56.         return (double) tgammaf((float) x);
  57. }
  58.  
  59. #endif /* defined(_DOUBLE_IS_32BITS) */
  60.