51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
|
/* s_asinhf.c -- float version of s_asinh.c.
|
||
|
|
* Conversion to float 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.
|
||
|
|
* ====================================================
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sys/cdefs.h>
|
||
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
||
|
|
__RCSID("$NetBSD: s_asinhf.c,v 1.8 2002/05/26 22:01:54 wiz Exp $");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "math.h"
|
||
|
|
#include "math_private.h"
|
||
|
|
|
||
|
|
static const float
|
||
|
|
one = 1.0000000000e+00, /* 0x3F800000 */
|
||
|
|
ln2 = 6.9314718246e-01, /* 0x3f317218 */
|
||
|
|
huge= 1.0000000000e+30;
|
||
|
|
|
||
|
|
float
|
||
|
|
asinhf(float x)
|
||
|
|
{
|
||
|
|
float t,w;
|
||
|
|
int32_t hx,ix;
|
||
|
|
GET_FLOAT_WORD(hx,x);
|
||
|
|
ix = hx&0x7fffffff;
|
||
|
|
if(ix>=0x7f800000) return x+x; /* x is inf or NaN */
|
||
|
|
if(ix< 0x31800000) { /* |x|<2**-28 */
|
||
|
|
if(huge+x>one) return x; /* return x inexact except 0 */
|
||
|
|
}
|
||
|
|
if(ix>0x4d800000) { /* |x| > 2**28 */
|
||
|
|
w = __ieee754_logf(fabsf(x))+ln2;
|
||
|
|
} else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */
|
||
|
|
t = fabsf(x);
|
||
|
|
w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t));
|
||
|
|
} else { /* 2.0 > |x| > 2**-28 */
|
||
|
|
t = x*x;
|
||
|
|
w =log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t)));
|
||
|
|
}
|
||
|
|
if(hx>0) return w; else return -w;
|
||
|
|
}
|