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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [mathfp/] [s_tgamma.c] - Rev 207
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/* @(#)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 <math.h> #include <errno.h> #ifdef __STDC__ double tgamma(double x) #else double tgamma(x) double x; #endif { double y; int local_signgam; y = gamma_r(x,&local_signgam); if (local_signgam < 0) y = -y; #ifdef _IEEE_LIBM return y; #else if(_LIB_VERSION == _IEEE_) return y; if(!finite(y)&&finite(x)) { if(floor(x)==x&&x<=0.0) { /* tgamma pole */ errno = EDOM; return HUGE_VAL; } else { /* tgamma overflow */ errno = ERANGE; return HUGE_VAL; } } return y; #endif }
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