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 | |
20 | static const float one = 1.0, shuge = 1.0e37; |
21 | |
22 | float |
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 | } |
60 | strong_alias (__ieee754_sinhf, __sinhf_finite) |
61 | |