text: /* @(#)s_asinh.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.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static char rcsid[] = "$NetBSD: s_asinh.c,v 1.9 1995/05/12 04:57:37 jtc Exp $";
  #endif
  
  /* asinh(x)
   * Method :
   *	Based on
   *		asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
   *	we have
   *	asinh(x) := x  if  1+x*x=1,
   *		 := sign(x)*(log(x)+ln2)) for large |x|, else
   *		 := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x|>2, else
   *		 := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2)))
   */
  
  #include "math.h"
  #include "math_private.h"
  #include <math_ldbl_opt.h>
  
  #ifdef __STDC__
  static const long double
  #else
  static long double
  #endif
  one =  1.00000000000000000000e+00L, /* 0x3ff0000000000000, 0 */
  ln2 =  0.6931471805599453094172321214581766L, /* 0x3fe62e42fefa39ef, 0x3c7abc9e3b398040 */
  huge=  1.00000000000000000000e+300L;
  
  #ifdef __STDC__
  	long double __asinhl(long double x)
  #else
  	long double __asinhl(x)
  	long double x;
  #endif
  {
  	long double t,w;
  	int64_t hx,ix;
  	GET_LDOUBLE_MSW64(hx,x);
  	ix = hx&0x7fffffffffffffffLL;
  	if(ix>=0x7ff0000000000000LL) return x+x;	/* x is inf or NaN */
  	if(ix< 0x3e20000000000000LL) {	/* |x|<2**-29 */
  	    if(huge+x>one) return x;	/* return x inexact except 0 */
  	}
  	if(ix>0x41b0000000000000LL) {	/* |x| > 2**28 */
  	    w = __ieee754_logl(fabs(x))+ln2;
  	} else if (ix>0x4000000000000000LL) {	/* 2**28 > |x| > 2.0 */
  	    t = fabs(x);
  	    w = __ieee754_logl(2.0*t+one/(__ieee754_sqrtl(x*x+one)+t));
  	} else {		/* 2.0 > |x| > 2**-29 */
  	    t = x*x;
  	    w =__log1pl(fabsl(x)+t/(one+__ieee754_sqrtl(one+t)));
  	}
  	if(hx>0) return w; else return -w;
  }
  long_double_symbol (libm, __asinhl, asinhl);
  