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