/home/jaouen/pok_official/pok/trunk/libpok/libm/frexpf.c

/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Fri Jan 30 14:41:34 2009 
 */

/* s_frexpf.c -- float version of s_frexp.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#ifdef POK_NEEDS_LIBMATH

#include <libm.h>
#include "math_private.h"

static const float
two25 =  3.3554432000e+07; /* 0x4c000000 */

float
frexpf(float x, int *eptr)
{
        int32_t hx,ix;
        GET_FLOAT_WORD(hx,x);
        ix = 0x7fffffff&hx;
        *eptr = 0;
        if(ix>=0x7f800000||(ix==0)) return x;   /* 0,inf,nan */
        if (ix<0x00800000) {            /* subnormal */
            x *= two25;
            GET_FLOAT_WORD(hx,x);
            ix = hx&0x7fffffff;
            *eptr = -25;
        }
        *eptr += (ix>>23)-126;
        hx = (hx&0x807fffff)|0x3f000000;
        SET_FLOAT_WORD(x,hx);
        return x;
}

#endif