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 * ====================================================
17 #include "math_private.h"
19 static const float one = 1.0, shuge = 1.0e37;
31 if(ix>=0x7f800000) return x+x;
35 /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */
36 if (ix < 0x41b00000) { /* |x|<22 */
37 if (ix<0x31800000) /* |x|<2**-28 */
38 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
40 if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
41 return h*(t+t/(t+one));
44 /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */
45 if (ix < 0x42b17180) return h*expf(fabsf(x));
47 /* |x| in [log(maxdouble), overflowthresold] */
49 w = expf((float)0.5*fabsf(x));
54 /* |x| > overflowthresold, sinh(x) overflow */