__rem_pio2_large
hidden int __rem_pio2_large(double*,double*,int,int,int);
n = __rem_pio2_large(tx,ty,(int)(ix>>20)-(0x3ff+23),i+1,1);
n = __rem_pio2_large(tx,ty,e0,1,0);
n = __rem_pio2_large(tx, ty, ex-0x3fff-23, i+1, NY);