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_tgamma.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 libm/w_tgamma.c (limited to 'libm/w_tgamma.c') diff --git a/libm/w_tgamma.c b/libm/w_tgamma.c new file mode 100644 index 000000000..0bacff16b --- /dev/null +++ b/libm/w_tgamma.c @@ -0,0 +1,47 @@ +/* @(#)w_gamma.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. + * ==================================================== + */ + +/* double gamma(double x) + * Return the logarithm of the Gamma function of x or the Gamma function of x, + * depending on the library mode. + */ + +#include +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include +#endif + +double +tgamma(double x) +{ +#if __UCLIBC_HAS_FENV__ + double y = __ieee754_tgamma(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(x,x,50); /* tgamma pole */ + else if(floor(x)==x&&x<0.0) + return __kernel_standard(x,x,41); /* tgamma domain */ + else if (y == 0) + __set_errno (ERANGE); /* tgamma underflow */ + else + return __kernel_standard(x,x,40); /* tgamma overflow */ + } + return y; +#else + return __ieee754_tgamma(x); +#endif +} +libm_hidden_def(tgamma); -- cgit v1.2.3