math/w_lgammaf_main.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 #include <lgamma-compat.h>
  20
  21 #if BUILD_LGAMMA
  22 float
  23 LGFUNC (__lgammaf) (float x)
  24 {
  25         float y = CALL_LGAMMA (float, __ieee754_lgammaf_r, x);
  26         if(__builtin_expect(!isfinite(y), 0)
  27            && isfinite(x) && _LIB_VERSION != _IEEE_)
  28                 return __kernel_standard_f(x, x,
  29                                            __floorf(x)==x&&x<=0.0f
  30                                            ? 115 /* lgamma pole */
  31                                            : 114); /* lgamma overflow */
  32
  33         return y;
  34 }
  35 # if USE_AS_COMPAT
  36 compat_symbol (libm, __lgammaf_compat, lgammaf, LGAMMA_OLD_VER);
  37 # else
  38 versioned_symbol (libm, __lgammaf, lgammaf, LGAMMA_NEW_VER);
  39 # endif
  40 # if GAMMA_ALIAS
  41 strong_alias (LGFUNC (__lgammaf), __gammaf)
  42 weak_alias (__gammaf, gammaf)
  43 # endif
  44 #endif