HLS assigns initial values to variables over 64bit

    ap_uint<128> P; 
    P.range(127, 64) = 0xffffffffffffffff;
    P.range(63, 0) = 0xfffffffffffffffb;

As shown above, to Passign a value to a 128bit variable , if it is directly written P=0xfffffffffffffffffffffffffffffffb, then the right side of the equal sign can only store 64bit, so Pthe value assigned can only be 0xfffffffffffffffb. Special attention should be paid to novices when using.