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       ---
       s_asinhf.c (1428B)
       ---
            1 /* s_asinhf.c -- float version of s_asinh.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/s_asinhf.c,v 1.8 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
           24 one =  1.0000000000e+00, /* 0x3F800000 */
           25 ln2 =  6.9314718246e-01, /* 0x3f317218 */
           26 huge=  1.0000000000e+30;
           27 
           28 float
           29 asinhf(float x)
           30 {
           31         float t,w;
           32         int32_t hx,ix;
           33         GET_FLOAT_WORD(hx,x);
           34         ix = hx&0x7fffffff;
           35         if(ix>=0x7f800000) return x+x;        /* x is inf or NaN */
           36         if(ix< 0x31800000) {        /* |x|<2**-28 */
           37             if(huge+x>one) return x;        /* return x inexact except 0 */
           38         }
           39         if(ix>0x4d800000) {        /* |x| > 2**28 */
           40             w = __ieee754_logf(fabsf(x))+ln2;
           41         } else if (ix>0x40000000) {        /* 2**28 > |x| > 2.0 */
           42             t = fabsf(x);
           43             w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t));
           44         } else {                /* 2.0 > |x| > 2**-28 */
           45             t = x*x;
           46             w =log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t)));
           47         }
           48         if(hx>0) return w; else return -w;
           49 }