ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / src / e_atanhf.c
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1/* e_atanhf.c -- float version of e_atanh.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 *
6ff43c94 15 * $FreeBSD: head/lib/msun/src/e_atanhf.c 176451 2008-02-22 02:30:36Z das $
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16 */
17
6ff43c94 18#include "math.h"
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19#include "math_private.h"
20
21static const float one = 1.0, huge = 1e30;
22
23static const float zero = 0.0;
24
25float
6ff43c94 26__ieee754_atanhf(float x)
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27{
28 float t;
29 int32_t hx,ix;
30 GET_FLOAT_WORD(hx,x);
31 ix = hx&0x7fffffff;
32 if (ix>0x3f800000) /* |x|>1 */
33 return (x-x)/(x-x);
34 if(ix==0x3f800000)
35 return x/zero;
36 if(ix<0x31800000&&(huge+x)>zero) return x; /* x<2**-28 */
37 SET_FLOAT_WORD(x,ix);
38 if(ix<0x3f000000) { /* x < 0.5 */
39 t = x+x;
40 t = (float)0.5*log1pf(t+t*x/(one-x));
41 } else
42 t = (float)0.5*log1pf((x+x)/(one-x));
43 if(hx>=0) return t; else return -t;
44}