toolchain/gcc/newlib/libm/mathfp/sf_tgamma.c

   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 <errno.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 = 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             {
  38               /* tgammaf pole */
  39               errno = EDOM;
  40               return HUGE_VAL;
  41             }
  42           else
  43             {
  44               /* tgammaf overflow */
  45               errno = ERANGE;
  46               return HUGE_VAL;
  47             }
  48         }
  49         return y;
  50 #endif
  51 }