source: trunk/libs/newlib/src/newlib/libm/math/sf_frexp.c @ 543

/* sf_frexp.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.
 * ====================================================
 */

#include "fdlibm.h"

#ifdef __STDC__
static const float
#else
static float
#endif
two25 =  3.3554432000e+07; /* 0x4c000000 */

#ifdef __STDC__
        float frexpf(float x, int *eptr)
#else
        float frexpf(x, eptr)
        float x; int *eptr;
#endif
{
        __int32_t hx, ix;
        GET_FLOAT_WORD(hx,x);
        ix = 0x7fffffff&hx;
        *eptr = 0;
        if(!FLT_UWORD_IS_FINITE(ix)||FLT_UWORD_IS_ZERO(ix)) return x;   /* 0,inf,nan */
        if (FLT_UWORD_IS_SUBNORMAL(ix)) {               /* 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;
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
        double frexp(double x, int *eptr)
#else
        double frexp(x, eptr)
        double x; int *eptr;
#endif
{
        return (double) frexpf((float) x, eptr);
}

#endif /* defined(_DOUBLE_IS_32BITS) */