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/* sf_rint.c -- float version of s_rint.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

TWO23[2]={

  8.3886080000e+06, /* 0x4b000000 */

 -8.3886080000e+06, /* 0xcb000000 */

};

#ifdef __STDC__

        float rintf(float x)

#else

        float rintf(x)

        float x;

#endif

{

        __int32_t i0,j0,sx;

        __uint32_t i,i1;

        float t;

        volatile float w;

        GET_FLOAT_WORD(i0,x);

        sx = (i0>>31)&1;

        j0 = ((i0>>23)&0xff)-0x7f;

        if(j0<23) {

            if(j0<0) {

                if((i0&0x7fffffff)==0) return x;

                i1 = (i0&0x07fffff);

                i0 &= 0xfff00000;

                i0 |= ((i1|-i1)>>9)&0x400000;

                SET_FLOAT_WORD(x,i0);

                w = TWO23[sx]+x;

                t =  w-TWO23[sx];

                GET_FLOAT_WORD(i0,t);

                SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));

                return t;

            } else {

                i = (0x007fffff)>>j0;

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

                i>>=1;

                if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0);

            }

        } else {

            if(j0==0x80) return x+x;    /* inf or NaN */

            else return x;              /* x is integral */

        }

        SET_FLOAT_WORD(x,i0);

        w = TWO23[sx]+x;

        return w-TWO23[sx];

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double rint(double x)

#else

        double rint(x)

        double x;

#endif

{

        return (double) rintf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */