Subversion Repositories openrisc_me

/* sf_floor.c -- float version of s_floor.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.

 * ====================================================

 */

/*

 * floorf(x)

 * Return x rounded toward -inf to integral value

 * Method:

 *      Bit twiddling.

 * Exception:

 *      Inexact flag raised if x not equal to floorf(x).

 */

#include "fdlibm.h"

#ifdef __STDC__

static const float huge = 1.0e30;

#else

static float huge = 1.0e30;

#endif

#ifdef __STDC__

        float floorf(float x)

#else

        float floorf(x)

        float x;

#endif

{

        __int32_t i0,j0;

        __uint32_t i,ix;

        GET_FLOAT_WORD(i0,x);

        ix = (i0&0x7fffffff);

        j0 = (ix>>23)-0x7f;

        if(j0<23) {

            if(j0<0) {   /* raise inexact if x != 0 */

                if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */

                    if(i0>=0) {i0=0;}

                    else if(!FLT_UWORD_IS_ZERO(ix))

                        { i0=0xbf800000;}

                }

            } else {

                i = (0x007fffff)>>j0;

                if((i0&i)==0) return x; /* x is integral */

                if(huge+x>(float)0.0) { /* raise inexact flag */

                    if(i0<0) i0 += (0x00800000)>>j0;

                    i0 &= (~i);

                }

            }

        } else {

            if(!FLT_UWORD_IS_FINITE(ix)) return x+x;    /* inf or NaN */

            else return x;              /* x is integral */

        }

        SET_FLOAT_WORD(x,i0);

        return x;

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double floor(double x)

#else

        double floor(x)

        double x;

#endif

{

        return (double) floorf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */