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 #include <math-svid-compat.h>
  19
  20 #include <lgamma-compat.h>
  21
  22 #if BUILD_LGAMMA
  23 float
  24 LGFUNC (__lgammaf) (float x)
  25 {
  26         float y = CALL_LGAMMA (float, __ieee754_lgammaf_r, x);
  27         if(__builtin_expect(!isfinite(y), 0)
  28            && isfinite(x) && _LIB_VERSION != _IEEE_)
  29                 return __kernel_standard_f(x, x,
  30                                            __floorf(x)==x&&x<=0.0f
  31                                            ? 115 /* lgamma pole */
  32                                            : 114); /* lgamma overflow */
  33
  34         return y;
  35 }
  36 # if USE_AS_COMPAT
  37 compat_symbol (libm, __lgammaf_compat, lgammaf, LGAMMA_OLD_VER);
  38 # else
  39 versioned_symbol (libm, __lgammaf, lgammaf, LGAMMA_NEW_VER);
  40 # endif
  41 # if GAMMA_ALIAS
  42 strong_alias (LGFUNC (__lgammaf), __gammaf)
  43 weak_alias (__gammaf, gammaf)
  44 # endif
  45 #endif