1 /* e_sinhf.c -- float version of e_sinh.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
18 #include <math_private.h>
20 static const float one
= 1.0, shuge
= 1.0e37
;
23 __ieee754_sinhf(float x
)
32 if(__builtin_expect(ix
>=0x7f800000, 0)) return x
+x
;
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 */
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
));
47 /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */
48 if (ix
< 0x42b17180) return h
*__ieee754_expf(fabsf(x
));
50 /* |x| in [log(maxdouble), overflowthresold] */
52 w
= __ieee754_expf((float)0.5*fabsf(x
));
57 /* |x| > overflowthresold, sinh(x) overflow */
58 return math_narrow_eval (x
*shuge
);
60 strong_alias (__ieee754_sinhf
, __sinhf_finite
)