/* sinh.c - math routine *//* Copyright 1992-1994 Wind River Systems, Inc. *//*modification history--------------------01f,09dec94,rhp  fix descriptions of hyperbolic fns.01e,05feb93,jdi  doc changes based on kdl review.01d,02dec92,jdi  doc tweaks.01c,28oct92,jdi  documentation cleanup.01b,20sep92,smb  documentation additions01a,08jul92,smb  documentation.*//*DESCRIPTION* Copyright (c) 1985 Regents of the University of California.* All rights reserved.** Redistribution and use in source and binary forms are permitted* provided that the above copyright notice and this paragraph are* duplicated in all such forms and that any documentation,* advertising materials, and other materials related to such* distribution and use acknowledge that the software was developed* by the University of California, Berkeley.  The name of the* University may not be used to endorse or promote products derived* from this software without specific prior written permission.* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.** All recipients should regard themselves as participants in an ongoing* research project and hence should feel obligated to report their* experiences (good or bad) with these elementary function codes, using* the sendbug(8) program, to the authors.*SEE ALSO: American National Standard X3.159-1989NOMANUAL*/#include "vxWorks.h"#include "math.h"#if defined(vax)||defined(tahoe)#ifdef vax#define _0x(A,B)	0x/**/A/**/B#else	/* vax */#define _0x(A,B)	0x/**/B/**/A#endif	/* vax *//* static double *//* mln2hi =  8.8029691931113054792E1     , Hex  2^  7   *  .B00F33C7E22BDB *//* mln2lo = -4.9650192275318476525E-16   , Hex  2^-50   * -.8F1B60279E582A *//* lnovfl =  8.8029691931113053016E1     ; Hex  2^  7   *  .B00F33C7E22BDA */static long    mln2hix[] = { _0x(0f33,43b0), _0x(2bdb,c7e2)};static long    mln2lox[] = { _0x(1b60,a70f), _0x(582a,279e)};static long    lnovflx[] = { _0x(0f33,43b0), _0x(2bda,c7e2)};#define   mln2hi    (*(double*)mln2hix)#define   mln2lo    (*(double*)mln2lox)#define   lnovfl    (*(double*)lnovflx)#else	/* defined(vax)||defined(tahoe) */static doublemln2hi =  7.0978271289338397310E2     , /*Hex  2^ 10   *  1.62E42FEFA39EF */mln2lo =  2.3747039373786107478E-14   , /*Hex  2^-45   *  1.ABC9E3B39803F */lnovfl =  7.0978271289338397310E2     ; /*Hex  2^  9   *  1.62E42FEFA39EF */#endif	/* defined(vax)||defined(tahoe) */#if defined(vax)||defined(tahoe)static max = 126                      ;#else	/* defined(vax)||defined(tahoe) */static max = 1023                     ;#endif	/* defined(vax)||defined(tahoe) *//********************************************************************************* sinh - compute a hyperbolic sine (ANSI)** This routine returns the hyperbolic sine of <x> in* double precision (IEEE double, 53 bits).** A range error occurs if <x> is too large.** INTERNAL:* Method:** (1) Reduce <x> to non-negative by sinh(-x) = - sinh(x).** (2)*    	                                     expm1(x) + expm1(x)/(expm1(x)+1)*    	   0 <= x <= lnovfl     : sinh(x) := --------------------------------*    			       		                      2*         lnovfl <= x <= lnovfl+ln2 : sinh(x) := expm1(x)/2 (avoid overflow)*     lnovfl+ln2 <  x <  INF        :  overflow to INF*    * INCLUDE FILES: math.h** RETURNS:* The double-precision hyperbolic sine of <x>.** Special cases:*     If <x> is +INF, -INF, or NaN, sinh() returns <x>.** SEE ALSO: mathALib*/double sinh    (    double x	/* number whose hyperbolic sine is required */    )    {	static double  one=1.0, half=1.0/2.0 ;	double expm1(), t, scalb(), copysign(), sign;#if !defined(vax)&&!defined(tahoe)	if(x!=x) return(x);	/* x is NaN */#endif	/* !defined(vax)&&!defined(tahoe) */	sign=copysign(one,x);	x=copysign(x,one);	if(x<lnovfl)	    {t=expm1(x); return(copysign((t+t/(one+t))*half,sign));}	else if(x <= lnovfl+0.7)		/* subtract x by ln(2^(max+1)) and return 2^max*exp(x)	    		to avoid unnecessary overflow */	    return(copysign(scalb(one+expm1((x-mln2hi)-mln2lo),max),sign));	else  /* sinh(+-INF) = +-INF, sinh(+-big no.) overflow to +-INF */	    return( expm1(x)*sign );    }