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 * ====================================================
16 #include <sys/cdefs.h>
18 #include "math_private.h"
20 static const float one = 1.0, shuge = 1.0e37;
32 if(ix>=0x7f800000) return x+x;
36 /* |x| in [0,9], return sign(x)*0.5*(E+E/(E+1))) */
37 if (ix < 0x41100000) { /* |x|<9 */
38 if (ix<0x39800000) /* |x|<2**-12 */
39 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
41 if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
42 return h*(t+t/(t+one));
45 /* |x| in [9, logf(maxfloat)] return 0.5*exp(|x|) */
46 if (ix < 0x42b17217) return h*expf(fabsf(x));
48 /* |x| in [logf(maxfloat), overflowthresold] */
50 return h*2.0F*__ldexp_expf(fabsf(x), -1);
52 /* |x| > overflowthresold, sinh(x) overflow */