If you think about taking stage 1 file saved by P1 and use it for stage 2 of ECM, the answer is "no".
Anyhow, you can do P1 with a GPU, much faster, for both stage 1 and 2, and it is not limited to ~1200 bits like the gpuECM is.
That because P1 for mersenne numbers is very efficient, moving the problem from "q1 is smooth", to "k is smooth", where q=2kp+1 is the factor you are looking for, which means about "2p times" faster than ecm (well, that is a coarse approximation, and not exactly correct).
Last fiddled with by LaurV on 20160818 at 03:47
