I'm pretty sure my old c2p routine is faster because it uses a lot more of RAM accesses, mainly fast ram, but still i guess WinUAE does not emulate the RAM's real speed and therefore will improve these accesses much more than on a real Amiga.
As for computing the whole cpu cycles both routines are taking, that's probably a bit beyond my knowledge. I am not to sure how much each instruction is taking. On the 68020 manual i have there are 3 different amount of cycles for each instructions (best, in cache, worst).
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