__kernel_rem_pio2
n = __kernel_rem_pio2(tx,y,e0,nx,2);
extern int __kernel_rem_pio2(double*,double*,int,int,int);
e0 = __kernel_rem_pio2(xd, yd, e0, NX, PREC);
e0 = __kernel_rem_pio2(xd, yd, e0, NX, PREC);
e0 = __kernel_rem_pio2(xd, yd, e0, NX, PREC);
e0 = __kernel_rem_pio2(xd, yd, e0, NX, PREC);