diff options
Diffstat (limited to 'libm/w_tgammal.c')
| -rw-r--r-- | libm/w_tgammal.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libm/w_tgammal.c b/libm/w_tgammal.c new file mode 100644 index 000000000..64ce302c0 --- /dev/null +++ b/libm/w_tgammal.c @@ -0,0 +1,51 @@ +/* w_gammal.c -- long double version of w_gamma.c. + * Conversion to long double by Ulrich Drepper, + * Cygnus Support, drepper@cygnus.com. + */ + +/* + * ==================================================== + * 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. + * ==================================================== + */ + +/* long double gammal(double x) + * Return the Gamma function of x. + */ + +#include <math.h> +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include <errno.h> +#endif + +#if !defined __NO_LONG_DOUBLE_MATH +long double +tgammal(long double x) +{ +# if __UCLIBC_HAS_FENV__ + long double y = (long double) __ieee754_tgamma((long double)x); + + if(__builtin_expect (!isfinite (y) || y == 0, 0) + && (isfinite (x) || (isinf (x) && x < 0.0)) + && _LIB_VERSION != _IEEE_) { + if(x==0.0) + return __kernel_standard_l(x,x,250); /* tgamma pole */ + else if(floorl(x)==x&&x<0.0L) + return __kernel_standard_l(x,x,241); /* tgamma domain */ + else if (y == 0) + __set_errno (ERANGE); /* tgamma underflow */ + else + return __kernel_standard_l(x,x,240); /* tgamma overflow */ + } + return y; +# else + return (long double) __ieee754_tgamma((long double)x); +# endif /* __UCLIBC_HAS_FENV__ */ +} +#endif /* __NO_LONG_DOUBLE_MATH */ |