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 <float.h>
17#include <math.h>
18#include <math_private.h>
19
20static const float one = 1.0, shuge = 1.0e37;
21
22float
23__ieee754_sinhf(float x)
24{
25 float t,w,h;
26 int32_t ix,jx;
27
28 GET_FLOAT_WORD(jx,x);
29 ix = jx&0x7fffffff;
30
31 /* x is INF or NaN */
32 if(__builtin_expect(ix>=0x7f800000, 0)) return x+x;
33
34 h = 0.5;
35 if (jx<0) h = -h;
36 /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */
37 if (ix < 0x41b00000) { /* |x|<22 */
38 if (__builtin_expect(ix<0x31800000, 0)) { /* |x|<2**-28 */
39 math_check_force_underflow (x);
40 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
41 }
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 [22, log(maxdouble)] return 0.5*exp(|x|) */
48 if (ix < 0x42b17180) return h*__ieee754_expf(fabsf(x));
49
50 /* |x| in [log(maxdouble), overflowthresold] */
51 if (ix<=0x42b2d4fc) {
52 w = __ieee754_expf((float)0.5*fabsf(x));
53 t = h*w;
54 return t*w;
55 }
56
57 /* |x| > overflowthresold, sinh(x) overflow */
58 return math_narrow_eval (x*shuge);
59}
60strong_alias (__ieee754_sinhf, __sinhf_finite)
61