From ea38f4d89c9698895b1cf53a5946429dc1d8bbaa Mon Sep 17 00:00:00 2001 From: Sergey Cherkashin <4erkashin@list.ru> Date: Tue, 3 Oct 2017 15:26:34 +0300 Subject: math: add exception handling functionality According to standards SVID and SYSV. Modified lgamma calling in case when 'signgam' variable should not be used. Signed-off-by: Waldemar Brodkorb --- libm/w_tgammal.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 libm/w_tgammal.c (limited to 'libm/w_tgammal.c') 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 +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include +#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 */ -- cgit v1.2.3