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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [w_atanh.c] - Rev 858
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/* @(#)w_atanh.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. * ==================================================== */ /* FUNCTION <<atanh>>, <<atanhf>>---inverse hyperbolic tangent INDEX atanh INDEX atanhf ANSI_SYNOPSIS #include <math.h> double atanh(double <[x]>); float atanhf(float <[x]>); TRAD_SYNOPSIS #include <math.h> double atanh(<[x]>) double <[x]>; float atanhf(<[x]>) float <[x]>; DESCRIPTION <<atanh>> calculates the inverse hyperbolic tangent of <[x]>. <<atanhf>> is identical, other than taking and returning <<float>> values. RETURNS <<atanh>> and <<atanhf>> return the calculated value. If @ifnottex |<[x]>| @end ifnottex @tex $|x|$ @end tex is greater than 1, the global <<errno>> is set to <<EDOM>> and the result is a NaN. A <<DOMAIN error>> is reported. If @ifnottex |<[x]>| @end ifnottex @tex $|x|$ @end tex is 1, the global <<errno>> is set to <<EDOM>>; and the result is infinity with the same sign as <<x>>. A <<SING error>> is reported. You can modify the error handling for these routines using <<matherr>>. PORTABILITY Neither <<atanh>> nor <<atanhf>> are ANSI C. QUICKREF atanh - pure atanhf - pure */ /* * wrapper atanh(x) */ #include "fdlibm.h" #include <errno.h> #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double atanh(double x) /* wrapper atanh */ #else double atanh(x) /* wrapper atanh */ double x; #endif { #ifdef _IEEE_LIBM return __ieee754_atanh(x); #else double z,y; struct exception exc; z = __ieee754_atanh(x); if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; y = fabs(x); if(y>=1.0) { if(y>1.0) { /* atanh(|x|>1) */ exc.type = DOMAIN; exc.name = "atanh"; exc.err = 0; exc.arg1 = exc.arg2 = x; exc.retval = 0.0/0.0; if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } } else { /* atanh(|x|=1) */ exc.type = SING; exc.name = "atanh"; exc.err = 0; exc.arg1 = exc.arg2 = x; exc.retval = x/0.0; /* sign(x)*inf */ if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } } if (exc.err != 0) errno = exc.err; return exc.retval; } else return z; #endif } #endif /* defined(_DOUBLE_IS_32BITS) */
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