Subversion Repositories openrisc_2011-10-31

/* ef_remainder.c -- float version of e_remainder.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 zero = 0.0;

#else

static float zero = 0.0;

#endif

#ifdef __STDC__

        float remainderf(float x, float p)

#else

        float remainderf(x,p)

        float x,p;

#endif

{

        __int32_t hx,hp;

        __uint32_t sx;

        float p_half;

        GET_FLOAT_WORD(hx,x);

        GET_FLOAT_WORD(hp,p);

        sx = hx&0x80000000;

        hp &= 0x7fffffff;

        hx &= 0x7fffffff;

    /* purge off exception values */

        if(hp==0) return (x*p)/(x*p);            /* p = 0 */

        if((hx>=0x7f800000)||                   /* x not finite */

          ((hp>0x7f800000)))                    /* p is NaN */

            return (x*p)/(x*p);

        if (hp<=0x7effffff) x = fmodf(x,p+p);   /* now x < 2p */

        if ((hx-hp)==0) return zero*x;

        x  = fabsf(x);

        p  = fabsf(p);

        if (hp<0x01000000) {

            if(x+x>p) {

                x-=p;

                if(x+x>=p) x -= p;

            }

        } else {

            p_half = (float)0.5*p;

            if(x>p_half) {

                x-=p;

                if(x>=p_half) x -= p;

            }

        }

        GET_FLOAT_WORD(hx,x);

        SET_FLOAT_WORD(x,hx^sx);

        return x;

}