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 static char rcsid[] = "$FreeBSD$";
21 #include "math_private.h"
23 static const float one = 1.0, shuge = 1.0e37;
26 __ieee754_sinhf(float x)
35 if(ix>=0x7f800000) return x+x;
39 /* |x| in [0,9], return sign(x)*0.5*(E+E/(E+1))) */
40 if (ix < 0x41100000) { /* |x|<9 */
41 if (ix<0x39800000) /* |x|<2**-12 */
42 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
44 if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
45 return h*(t+t/(t+one));
48 /* |x| in [9, logf(maxfloat)] return 0.5*exp(|x|) */
49 if (ix < 0x42b17217) return h*__ieee754_expf(fabsf(x));
51 /* |x| in [logf(maxfloat), overflowthresold] */
53 w = __ieee754_expf((float)0.5*fabsf(x));
58 /* |x| > overflowthresold, sinh(x) overflow */