the -cp option at the moment does not convert private key hex to uncompressed address format i am sure this is not a bug also for convenience can you update -><
Currently it just converts a private key to a private key and then exits. And it looks like there is an flag to do uncompressed key conversion called
isComp which is passed to the internal function that does the conversion but it's not enabled by default.
https://github.com/JeanLucPons/VanitySearch/blob/1bc508a19e2066777f3fb1a020f68f8705daf0f4/main.cpp#L469-cp option update:
add read from input file for -cp option where it can read bunch of private key in hex format from text file instead of single computation to leverage gpu horse power for converting pre computed private keys and converting to compressed and uncompressed address format there is no tool out there does this using gpu i am pretty most people want their pre computed private keys to be converted as a side benefit.
Why with GPUs? That option is basically a conversion utility that already runs quickly, it doesn't start a vanity address search like the others.