/* @(#)e_remainder.c 5.1 93/09/24 *//* * ==================================================== * 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. * ==================================================== *//* __ieee754_remainder(x,p) * Return :                   * 	returns  x REM p  =  x - [x/p]*p as if in infinite  * 	precise arithmetic, where [x/p] is the (infinite bit)  *	integer nearest x/p (in half way case choose the even one). * Method :  *	Based on fmod() return x-[x/p]chopped*p exactlp. */#include "fdlibm.h"#ifndef _DOUBLE_IS_32BITS#ifdef __STDC__static const double zero = 0.0;#elsestatic double zero = 0.0;#endif#ifdef __STDC__	double __ieee754_remainder(double x, double p)#else	double __ieee754_remainder(x,p)	double x,p;#endif{	__int32_t hx,hp;	__uint32_t sx,lx,lp;	double p_half;	EXTRACT_WORDS(hx,lx,x);	EXTRACT_WORDS(hp,lp,p);	sx = hx&0x80000000;	hp &= 0x7fffffff;	hx &= 0x7fffffff;    /* purge off exception values */	if((hp|lp)==0) return (x*p)/(x*p); 	/* p = 0 */	if((hx>=0x7ff00000)||			/* x not finite */	  ((hp>=0x7ff00000)&&			/* p is NaN */	  (((hp-0x7ff00000)|lp)!=0)))	    return (x*p)/(x*p);	if (hp<=0x7fdfffff) x = __ieee754_fmod(x,p+p);	/* now x < 2p */	if (((hx-hp)|(lx-lp))==0) return zero*x;	x  = fabs(x);	p  = fabs(p);	if (hp<0x00200000) {	    if(x+x>p) {		x-=p;		if(x+x>=p) x -= p;	    }	} else {	    p_half = 0.5*p;	    if(x>p_half) {		x-=p;		if(x>=p_half) x -= p;	    }	}	GET_HIGH_WORD(hx,x);	SET_HIGH_WORD(x,hx^sx);	return x;}#endif /* defined(_DOUBLE_IS_32BITS) */