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 * ====================================================
15 * $FreeBSD: head/lib/msun/src/e_sinhf.c 226598 2011-10-21 06:28:47Z das $
19 #include "math_private.h"
21 static const float one = 1.0, shuge = 1.0e37;
24 __ieee754_sinhf(float x)
33 if(ix>=0x7f800000) return x+x;
37 /* |x| in [0,9], return sign(x)*0.5*(E+E/(E+1))) */
38 if (ix < 0x41100000) { /* |x|<9 */
39 if (ix<0x39800000) /* |x|<2**-12 */
40 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
42 if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
43 return h*(t+t/(t+one));
46 /* |x| in [9, logf(maxfloat)] return 0.5*exp(|x|) */
47 if (ix < 0x42b17217) return h*__ieee754_expf(fabsf(x));
49 /* |x| in [logf(maxfloat), overflowthresold] */
51 return h*2.0F*__ldexp_expf(fabsf(x), -1);
53 /* |x| > overflowthresold, sinh(x) overflow */