1 /* s_asinhf.c -- float version of s_asinh.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
16 #include <sys/cdefs.h>
17 #if defined(LIBM_SCCS) && !defined(lint)
18 __RCSID("$NetBSD: s_asinhf.c,v 1.8 2002/05/26 22:01:54 wiz Exp $");
22 #include "math_private.h"
25 one
= 1.0000000000e+00, /* 0x3F800000 */
26 ln2
= 6.9314718246e-01, /* 0x3f317218 */
27 huge
= 1.0000000000e+30;
36 if(ix
>=0x7f800000) return x
+x
; /* x is inf or NaN */
37 if(ix
< 0x31800000) { /* |x|<2**-28 */
38 if(huge
+x
>one
) return x
; /* return x inexact except 0 */
40 if(ix
>0x4d800000) { /* |x| > 2**28 */
41 w
= __ieee754_logf(fabsf(x
))+ln2
;
42 } else if (ix
>0x40000000) { /* 2**28 > |x| > 2.0 */
44 w
= __ieee754_logf((float)2.0*t
+one
/(__ieee754_sqrtf(x
*x
+one
)+t
));
45 } else { /* 2.0 > |x| > 2**-28 */
47 w
=log1pf(fabsf(x
)+t
/(one
+__ieee754_sqrtf(one
+t
)));
49 if(hx
>0) return w
; else return -w
;