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 * $NetBSD: e_sinhf.c,v 1.7 2002/05/26 22:01:52 wiz Exp $
16 * $DragonFly: src/lib/libm/src/e_sinhf.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
20 #include "math_private.h"
22 static const float one = 1.0, shuge = 1.0e37;
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*expf(fabsf(x));
50 /* |x| in [log(maxdouble), overflowthresold] */
52 w = expf((float)0.5*fabsf(x));
57 /* |x| > overflowthresold, sinh(x) overflow */