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/* See the import.pl script for potential modifications */
/* e_atanhf.c -- Simple version of e_atanh.c.
* Conversion to Simple by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
*/
/*
* ====================================================
* 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: e_atanhf.c,v 1.4f 1995/05/10 20:44:56 jtc Exp $";
#endif
#include "SMath.h"
#include "math_private.h"
namespace streflop_libm {
#ifdef __STDC__
static const Simple one = 1.0f, huge = 1e30f;
#else
static Simple one = 1.0f, huge = 1e30f;
#endif
#ifdef __STDC__
static const Simple zero = 0.0f;
#else
static Simple zero = 0.0f;
#endif
#ifdef __STDC__
Simple __ieee754_atanhf(Simple x)
#else
Simple __ieee754_atanhf(x)
Simple x;
#endif
{
Simple t;
int32_t hx,ix;
GET_FLOAT_WORD(hx,x);
ix = hx&0x7fffffff;
if (ix>0x3f800000) /* |x|>1 */
return (x-x)/(x-x);
if(ix==0x3f800000)
return x/zero;
if(ix<0x31800000&&(huge+x)>zero) return x; /* x<2**-28 */
SET_FLOAT_WORD(x,ix);
if(ix<0x3f000000) { /* x < 0.5f */
t = x+x;
t = (Simple)0.5f*__log1pf(t+t*x/(one-x));
} else
t = (Simple)0.5f*__log1pf((x+x)/(one-x));
if(hx>=0) return t; else return -t;
}
}
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