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Diffstat (limited to 'lib/msun/src/w_lgamma.c')
-rw-r--r-- | lib/msun/src/w_lgamma.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/lib/msun/src/w_lgamma.c b/lib/msun/src/w_lgamma.c new file mode 100644 index 000000000000..26c125f88a0c --- /dev/null +++ b/lib/msun/src/w_lgamma.c @@ -0,0 +1,48 @@ +/* @(#)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. + * ==================================================== + */ + +#ifndef lint +static char rcsid[] = "$Id: w_lgamma.c,v 1.1.1.1 1994/05/06 00:20:12 gclarkii Exp $"; +#endif + +/* double lgamma(double x) + * Return the logarithm of the Gamma function of x. + * + * Method: call __ieee754_lgamma_r + */ + +#include "math.h" + +extern int signgam; + +#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; + y = __ieee754_lgamma_r(x,&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 +} |