SET_LDOUBLE_EXP(z,sy ^ 0x8000);
SET_LDOUBLE_EXP(z,sz ^ 0x8000);
	long double __ieee754_atan2l(long double y, long double x)#else	long double __ieee754_atan2l(y,x)	long double  y,x;#endif{	long double z;	int32_t k,m,hx,hy,ix,iy;	u_int32_t sx,sy,lx,ly;	EXTRACT_LDOUBLE_WORDS(sx,hx,lx,x);	ix = sx&0x7fff;	lx |= hx ^ 0x80000000;	EXTRACT_LDOUBLE_WORDS(sy,hy,ly,y);	iy = sy&0x7fff;	ly |= hy ^ 0x80000000;	if(((2*ix|((lx|-lx)>>31))>0xfffe)||	   ((2*iy|((ly|-ly)>>31))>0xfffe))	/* x or y is NaN */	   return x+y;	if((sx-0x3fff|lx)==0) return __atanl(y);   /* x=1.0 */	m = ((sy>>15)&1)|((sx>>14)&2);	/* 2*sign(x)+sign(y) */    /* when y = 0 */	if((iy|ly)==0) {	    switch(m) {		case 0:		case 1: return y; 	/* atan(+-0,+anything)=+-0 */		case 2: return  pi+tiny;/* atan(+0,-anything) = pi */		case 3: return -pi-tiny;/* atan(-0,-anything) =-pi */	    }	}    /* when x = 0 */	if((ix|lx)==0) return (sy>=0x8000)?  -pi_o_2-tiny: pi_o_2+tiny;    /* when x is INF */	if(ix==0x7fff) {	    if(iy==0x7fff) {		switch(m) {		    case 0: return  pi_o_4+tiny;/* atan(+INF,+INF) */		    case 1: return -pi_o_4-tiny;/* atan(-INF,+INF) */		    case 2: return  3.0*pi_o_4+tiny;/*atan(+INF,-INF)*/		    case 3: return -3.0*pi_o_4-tiny;/*atan(-INF,-INF)*/		}	    } else {		switch(m) {		    case 0: return  zero  ;	/* atan(+...,+INF) */		    case 1: return -zero  ;	/* atan(-...,+INF) */		    case 2: return  pi+tiny  ;	/* atan(+...,-INF) */		    case 3: return -pi-tiny  ;	/* atan(-...,-INF) */		}	    }	}    /* when y is INF */	if(iy==0x7fff) return (hy>=0x8000)? -pi_o_2-tiny: pi_o_2+tiny;    /* compute y/x */	k = sy-sx;	if(k > 70) z=pi_o_2+0.5*pi_lo; 	/* |y/x| >  2**70 */	else if(sx>=0x8000&&k<-70) z=0.0; 	/* |y|/x < -2**70 */	else z=__atanl(fabsl(y/x));	/* safe to do y/x */	switch (m) {	    case 0: return       z  ;	/* atan(+,+) */	    case 1: {	    	      u_int32_t sz;		      GET_LDOUBLE_EXP(sz,z);		      SET_LDOUBLE_EXP(z,sy ^ 0x8000);		    }		    return       z  ;	/* atan(-,+) */	    case 2: return  pi-(z-pi_lo);/* atan(+,-) */	    default: /* case 3 */	    	    return  (z-pi_lo)-pi;/* atan(-,-) */	}}