/* derived from /netlib/fdlibm */ /* @(#)s_rint.c 1.3 95/01/18 *//* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunSoft, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice  * is preserved. * ==================================================== */ /* dummy routine to get around over-eager arm compiler optimization.  * Calling this causes a store and reload of floating point numbers  */ voiddummy(void){}  /* * rint(x) * Return x rounded to integral value according to the prevailing * rounding mode. * Method: *	Using floating addition. * Exception: *	Inexact flag raised if x not equal to rint(x). */ #include "fdlibm.h" static const doubleTWO52[2]={  4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */}; 	double rint(double x){	int i0,j0,sx;	unsigned i,i1;	double w,t;	i0 =  __HI(x);	sx = (i0>>31)&1;	i1 =  __LO(x);	j0 = ((i0>>20)&0x7ff)-0x3ff;	if(j0<20) {	    if(j0<0) { 			if(((i0&0x7fffffff)|i1)==0) return x;		i1 |= (i0&0x0fffff);		i0 &= 0xfffe0000;		i0 |= ((i1|-i1)>>12)&0x80000;		__HI(x)=i0;	        w = TWO52[sx]+x;                 dummy();			/* fix optimiser */	        t =  w-TWO52[sx];	        i0 = __HI(t);	        __HI(t) = (i0&0x7fffffff)|(sx<<31);	        return t;	    } else {		i = (0x000fffff)>>j0;		if(((i0&i)|i1)==0) return x; /* x is integral */		i>>=1;		if(((i0&i)|i1)!=0) {		    if(j0==19) i1 = 0x40000000; else		    i0 = (i0&(~i))|((0x20000)>>j0);		}	    }	} else if (j0>51) {	    if(j0==0x400) return x+x;	/* inf or NaN */	    else return x;		/* x is integral */	} else {	    i = ((unsigned)(0xffffffff))>>(j0-20);	    if((i1&i)==0) return x;	/* x is integral */	    i>>=1;	    if((i1&i)!=0) i1 = (i1&(~i))|((0x40000000)>>(j0-20));	}	__HI(x) = i0;	__LO(x) = i1;	w = TWO52[sx]+x;	dummy();			/* fix optimiser */	return w-TWO52[sx];}