double s2,s_h,s_l,t_h,t_l;
	double __ieee754_pow(double x, double y)#else	double __ieee754_pow(x,y)	double x, y;#endif{	double z,ax,z_h,z_l,p_h,p_l;	double y1,t1,t2,r,s,t,u,v,w;	int i,j,k,yisint,n;	int hx,hy,ix,iy;	unsigned lx,ly;	hx = __HI(x); lx = __LO(x);	hy = __HI(y); ly = __LO(y);	ix = hx&0x7fffffff;  iy = hy&0x7fffffff;    /* y==zero: x**0 = 1 */	if((iy|ly)==0) return one; 	    /* +-NaN return x+y */	if(ix > 0x7ff00000 || ((ix==0x7ff00000)&&(lx!=0)) ||	   iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0))) 		return x+y;	    /* determine if y is an odd int when x < 0     * yisint = 0	... y is not an integer     * yisint = 1	... y is an odd int     * yisint = 2	... y is an even int     */	yisint  = 0;	if(hx<0) {		    if(iy>=0x43400000) yisint = 2; /* even integer y */	    else if(iy>=0x3ff00000) {		k = (iy>>20)-0x3ff;	   /* exponent */		if(k>20) {		    j = ly>>(52-k);		    if((j<<(52-k))==(int)ly) yisint = 2-(j&1);		} else if(ly==0) {		    j = iy>>(20-k);		    if((j<<(20-k))==iy) yisint = 2-(j&1);		}	    }			}     /* special value of y */	if(ly==0) { 		    if (iy==0x7ff00000) {	/* y is +-inf */	        if(((ix-0x3ff00000)|lx)==0)		    return  y - y;	/* inf**+-1 is NaN */	        else if (ix >= 0x3ff00000)/* (|x|>1)**+-inf = inf,0 */		    return (hy>=0)? y: zero;	        else			/* (|x|<1)**-,+inf = inf,0 */		    return (hy<0)?-y: zero;	    } 	    if(iy==0x3ff00000) {	/* y is  +-1 */		if(hy<0) return one/x; else return x;	    }	    if(hy==0x40000000) return x*x; /* y is  2 */	    if(hy==0x3fe00000) {	/* y is  0.5 */		if(hx>=0)	/* x >= +0 */		return fd_sqrt(x);		    }	}	ax   = fd_fabs(x);    /* special value of x */	if(lx==0) {	    if(ix==0x7ff00000||ix==0||ix==0x3ff00000){		z = ax;			/*x is +-0,+-inf,+-1*/		if(hy<0) z = one/z;	/* z = (1/|x|) */		if(hx<0) {		    if(((ix-0x3ff00000)|yisint)==0) {			z = (z-z)/(z-z); /* (-1)**non-int is NaN */		    } else if(yisint==1) {#ifdef HPUX			__HI(z) ^= 1<<31; /* some HPUXes cannot negate 0.. */#else			z = -z;		/* (x<0)**odd = -(|x|**odd) */#endif			}		}		return z;	    }	}        /* (x<0)**(non-int) is NaN */	if((((hx>>31)+1)|yisint)==0) return (x-x)/(x-x);    /* |y| is really_big */	if(iy>0x41e00000) { /* if |y| > 2**31 */	    if(iy>0x43f00000){	/* if |y| > 2**64, must o/uflow */		if(ix<=0x3fefffff) return (hy<0)? really_big*really_big:tiny*tiny;		if(ix>=0x3ff00000) return (hy>0)? really_big*really_big:tiny*tiny;	    }	/* over/underflow if x is not close to one */	    if(ix<0x3fefffff) return (hy<0)? really_big*really_big:tiny*tiny;	    if(ix>0x3ff00000) return (hy>0)? really_big*really_big:tiny*tiny;	/* now |1-x| is tiny <= 2**-20, suffice to compute 	   log(x) by x-x^2/2+x^3/3-x^4/4 */	    t = x-1;		/* t has 20 trailing zeros */	    w = (t*t)*(0.5-t*(0.3333333333333333333333-t*0.25));	    u = ivln2_h*t;	/* ivln2_h has 21 sig. bits */	    v = t*ivln2_l-w*ivln2;	    t1 = u+v;	    __LO(t1) = 0;	    t2 = v-(t1-u);	} else {	    double s2,s_h,s_l,t_h,t_l;	    n = 0;	/* take care subnormal number */	    if(ix<0x00100000)		{ax *= two53; n -= 53; ix = __HI(ax); }	    n  += ((ix)>>20)-0x3ff;	    j  = ix&0x000fffff;	/* determine interval */	    ix = j|0x3ff00000;		/* normalize ix */	    if(j<=0x3988E) k=0;		/* |x|<sqrt(3/2) */	    else if(j<0xBB67A) k=1;	/* |x|<sqrt(3)   */	    else {k=0;n+=1;ix -= 0x00100000;}	    __HI(ax) = ix;	/* compute s = s_h+s_l = (x-1)/(x+1) or (x-1.5)/(x+1.5) */	    u = ax-bp[k];		/* bp[0]=1.0, bp[1]=1.5 */	    v = one/(ax+bp[k]);	    s = u*v;	    s_h = s;	    __LO(s_h) = 0;	/* t_h=ax+bp[k] High */	    t_h = zero;	    __HI(t_h)=((ix>>1)|0x20000000)+0x00080000+(k<<18); 	    t_l = ax - (t_h-bp[k]);	    s_l = v*((u-s_h*t_h)-s_h*t_l);	/* compute log(ax) */	    s2 = s*s;	    r = s2*s2*(L1+s2*(L2+s2*(L3+s2*(L4+s2*(L5+s2*L6)))));	    r += s_l*(s_h+s);	    s2  = s_h*s_h;	    t_h = 3.0+s2+r;	    __LO(t_h) = 0;	    t_l = r-((t_h-3.0)-s2);	/* u+v = s*(1+...) */	    u = s_h*t_h;	    v = s_l*t_h+t_l*s;	/* 2/(3log2)*(s+...) */	    p_h = u+v;	    __LO(p_h) = 0;	    p_l = v-(p_h-u);	    z_h = cp_h*p_h;		/* cp_h+cp_l = 2/(3*log2) */	    z_l = cp_l*p_h+p_l*cp+dp_l[k];	/* log2(ax) = (s+..)*2/(3*log2) = n + dp_h + z_h + z_l */	    t = (double)n;	    t1 = (((z_h+z_l)+dp_h[k])+t);	    __LO(t1) = 0;	    t2 = z_l-(((t1-t)-dp_h[k])-z_h);	}	s = one; /* s (sign of result -ve**odd) = -1 else = 1 */	if((((hx>>31)+1)|(yisint-1))==0) s = -one;/* (-ve)**(odd int) */    /* split up y into y1+y2 and compute (y1+y2)*(t1+t2) */	y1  = y;	__LO(y1) = 0;	p_l = (y-y1)*t1+y*t2;	p_h = y1*t1;	z = p_l+p_h;	j = __HI(z);	i = __LO(z);	if (j>=0x40900000) {				/* z >= 1024 */	    if(((j-0x40900000)|i)!=0)			/* if z > 1024 */		return s*really_big*really_big;			/* overflow */	    else {		if(p_l+ovt>z-p_h) return s*really_big*really_big;	/* overflow */	    }	} else if((j&0x7fffffff)>=0x4090cc00 ) {	/* z <= -1075 */	    if(((j-0xc090cc00)|i)!=0) 		/* z < -1075 */		return s*tiny*tiny;		/* underflow */	    else {		if(p_l<=z-p_h) return s*tiny*tiny;	/* underflow */	    }	}    /*     * compute 2**(p_h+p_l)     */	i = j&0x7fffffff;	k = (i>>20)-0x3ff;	n = 0;	if(i>0x3fe00000) {		/* if |z| > 0.5, set n = [z+0.5] */	    n = j+(0x00100000>>(k+1));	    k = ((n&0x7fffffff)>>20)-0x3ff;	/* new k for n */	    t = zero;	    __HI(t) = (n&~(0x000fffff>>k));	    n = ((n&0x000fffff)|0x00100000)>>(20-k);	    if(j<0) n = -n;	    p_h -= t;	} 	t = p_l+p_h;	__LO(t) = 0;	u = t*lg2_h;	v = (p_l-(t-p_h))*lg2+t*lg2_l;	z = u+v;	w = v-(z-u);	t  = z*z;	t1  = z - t*(P1+t*(P2+t*(P3+t*(P4+t*P5))));	r  = (z*t1)/(t1-two)-(w+z*w);	z  = one-(r-z);	j  = __HI(z);	j += (n<<20);	if((j>>20)<=0) z = fd_scalbn(z,n);	/* subnormal output */	else __HI(z) += (n<<20);	return s*z;}