1/* e_sinhf.c -- float version of e_sinh.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 <sys/cdefs.h>
17__FBSDID("$FreeBSD$");
18
19#include "math.h"
20#include "math_private.h"
21
22static const float one = 1.0, shuge = 1.0e37;
23
24float
25__ieee754_sinhf(float x)
26{
27	float t,h;
28	int32_t ix,jx;
29
30	GET_FLOAT_WORD(jx,x);
31	ix = jx&0x7fffffff;
32
33    /* x is INF or NaN */
34	if(ix>=0x7f800000) return x+x;
35
36	h = 0.5;
37	if (jx<0) h = -h;
38    /* |x| in [0,9], return sign(x)*0.5*(E+E/(E+1))) */
39	if (ix < 0x41100000) {		/* |x|<9 */
40	    if (ix<0x39800000) 		/* |x|<2**-12 */
41		if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
42	    t = expm1f(fabsf(x));
43	    if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
44	    return h*(t+t/(t+one));
45	}
46
47    /* |x| in [9, logf(maxfloat)] return 0.5*exp(|x|) */
48	if (ix < 0x42b17217)  return h*__ieee754_expf(fabsf(x));
49
50    /* |x| in [logf(maxfloat), overflowthresold] */
51	if (ix<=0x42b2d4fc)
52	    return h*2.0F*__ldexp_expf(fabsf(x), -1);
53
54    /* |x| > overflowthresold, sinh(x) overflow */
55	return x*shuge;
56}
57