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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_lgamma.c] - Rev 816
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/* @(#)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. * ==================================================== * */ /* double lgamma(double x) * Return the logarithm of the Gamma function of x. * * Method: call __ieee754_lgamma_r */ #include "fdlibm.h" #include <reent.h> #include <errno.h> #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double lgamma(double x) #else double lgamma(x) double x; #endif { #ifdef _IEEE_LIBM return __ieee754_lgamma_r(x,&(_REENT_SIGNGAM(_REENT))); #else double y; struct exception exc; y = __ieee754_lgamma_r(x,&(_REENT_SIGNGAM(_REENT))); if(_LIB_VERSION == _IEEE_) return y; if(!finite(y)&&finite(x)) { #ifndef HUGE_VAL #define HUGE_VAL inf double inf = 0.0; SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ #endif exc.name = "lgamma"; exc.err = 0; exc.arg1 = x; exc.arg2 = x; if (_LIB_VERSION == _SVID_) exc.retval = HUGE; else exc.retval = HUGE_VAL; if(floor(x)==x&&x<=0.0) { /* lgamma(-integer) */ exc.type = SING; if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } } else { /* lgamma(finite) overflow */ exc.type = OVERFLOW; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } } if (exc.err != 0) errno = exc.err; return exc.retval; } else return y; #endif } #endif /* defined(_DOUBLE_IS_32BITS) */