Subversion Repositories openrisc

/* 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) */