1/* s_asinhf.c -- float version of s_asinh.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
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
12 * is preserved.
13 * ====================================================
14 */
15
16#include <float.h>
17#include <math.h>
18#include <math_private.h>
19
20static const float
21one = 1.0000000000e+00, /* 0x3F800000 */
22ln2 = 6.9314718246e-01, /* 0x3f317218 */
23huge= 1.0000000000e+30;
24
25float
26__asinhf(float x)
27{
28 float w;
29 int32_t hx,ix;
30 GET_FLOAT_WORD(hx,x);
31 ix = hx&0x7fffffff;
32 if(__builtin_expect(ix< 0x38000000, 0)) { /* |x|<2**-14 */
33 math_check_force_underflow (x);
34 if(huge+x>one) return x; /* return x inexact except 0 */
35 }
36 if(__builtin_expect(ix>0x47000000, 0)) { /* |x| > 2**14 */
37 if(ix>=0x7f800000) return x+x; /* x is inf or NaN */
38 w = __ieee754_logf(fabsf(x))+ln2;
39 } else {
40 float xa = fabsf(x);
41 if (ix>0x40000000) { /* 2**14 > |x| > 2.0 */
42 w = __ieee754_logf(2.0f*xa+one/(__ieee754_sqrtf(xa*xa+one)+xa));
43 } else { /* 2.0 > |x| > 2**-14 */
44 float t = xa*xa;
45 w =__log1pf(xa+t/(one+__ieee754_sqrtf(one+t)));
46 }
47 }
48 return __copysignf(w, x);
49}
50weak_alias (__asinhf, asinhf)
51