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       ---
       e_sinhf.c (1581B)
       ---
            1 /* e_sinhf.c -- float version of e_sinh.c.
            2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
            3  */
            4 
            5 /*
            6  * ====================================================
            7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
            8  *
            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
           12  * is preserved.
           13  * ====================================================
           14  */
           15 
           16 #ifndef lint
           17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_sinhf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           18 #endif
           19 
           20 #include "math.h"
           21 #include "math_private.h"
           22 
           23 static const float one = 1.0, shuge = 1.0e37;
           24 
           25 float
           26 __ieee754_sinhf(float x)
           27 {
           28         float t,w,h;
           29         int32_t ix,jx;
           30 
           31         GET_FLOAT_WORD(jx,x);
           32         ix = jx&0x7fffffff;
           33 
           34     /* x is INF or NaN */
           35         if(ix>=0x7f800000) return x+x;
           36 
           37         h = 0.5;
           38         if (jx<0) h = -h;
           39     /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */
           40         if (ix < 0x41b00000) {                /* |x|<22 */
           41             if (ix<0x31800000)                 /* |x|<2**-28 */
           42                 if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */
           43             t = expm1f(fabsf(x));
           44             if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one));
           45             return h*(t+t/(t+one));
           46         }
           47 
           48     /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */
           49         if (ix < 0x42b17180)  return h*__ieee754_expf(fabsf(x));
           50 
           51     /* |x| in [log(maxdouble), overflowthresold] */
           52         if (ix<=0x42b2d4fc) {
           53             w = __ieee754_expf((float)0.5*fabsf(x));
           54             t = h*w;
           55             return t*w;
           56         }
           57 
           58     /* |x| > overflowthresold, sinh(x) overflow */
           59         return x*shuge;
           60 }