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Diffstat (limited to 'math/w_lgamma.c')
| -rw-r--r-- | math/w_lgamma.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/math/w_lgamma.c b/math/w_lgamma.c new file mode 100644 index 0000000000..ab75f75997 --- /dev/null +++ b/math/w_lgamma.c @@ -0,0 +1,60 @@ +/* @(#)w_lgamma.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $"; +#endif + +/* double lgamma(double x) + * Return the logarithm of the Gamma function of x. + * + * Method: call __ieee754_lgamma_r + */ + +#include <math.h> +#include "math_private.h" + +#ifdef __STDC__ + double __lgamma(double x) +#else + double __lgamma(x) + double x; +#endif +{ +#ifdef _IEEE_LIBM + return __ieee754_lgamma_r(x,&signgam); +#else + double y; + int local_signgam = 0; + y = __ieee754_lgamma_r(x,&local_signgam); + if (_LIB_VERSION != _ISOC_) + /* ISO C99 does not define the global variable. */ + signgam = local_signgam; + if(_LIB_VERSION == _IEEE_) return y; + if(!__finite(y)&&__finite(x)) { + if(__floor(x)==x&&x<=0.0) + return __kernel_standard(x,x,15); /* lgamma pole */ + else + return __kernel_standard(x,x,14); /* lgamma overflow */ + } else + return y; +#endif +} +weak_alias (__lgamma, lgamma) +strong_alias (__lgamma, __gamma) +weak_alias (__gamma, gamma) +#ifdef NO_LONG_DOUBLE +strong_alias (__lgamma, __lgammal) +weak_alias (__lgamma, lgammal) +strong_alias (__gamma, __gammal) +weak_alias (__gamma, gammal) +#endif |