1 /* e_sinhf.c -- float version of e_sinh.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/e_sinhf.c,v 1.5 1999/08/28 00:06:39 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/e_sinhf.c,v 1.3 2004/12/29 15:22:57 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
22 static const float one = 1.0, shuge = 1.0e37;
25 __ieee754_sinhf(float x)
34 if(ix>=0x7f800000) return x+x;
38 /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */
39 if (ix < 0x41b00000) { /* |x|<22 */
40 if (ix<0x31800000) /* |x|<2**-28 */
41 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
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 */