I don't think debut of gpu miner would immediately cause 1000x mining power increase, so probably not gonna be anywhere near this dramatic.
Do you plan to include gmp optimiztions to primecoind miner?
I will be testing mikaelh's optimization tomorrow.
I know I for one would prefer that gpled and lgpled requirments stay out of primecoind, maybe these this type of change belongs in a standalone miner, or maybe used libfastmath?