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It's also been demonstrated repeatedly that emulators in general and MAME in particular have performance profiles unlike anything else people commonly run on Intel CPUs. I strongly suggest not holding your breath.
Yes I've benchmarked Mame previously with PGO and the results were very different across a range of emulated arcade systems with some gaining basically nothing while others gained ~15-20%, will be interesting to see what x32 can offer, given how cpu bound Mame is.
Also while I assume by 'Intel CPUs' you meant the x86 acrhitecture, I'd just wanted to point out that x32 won't benefit Intel 64-bit cpu's more than AMD 64-bit cpu's as the only thing it does is to allow using the full x86_64 register set together with 32-bit pointers rather than 64-bit pointers, thus making the code footprint smaller.
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I do appreciate people ginning up new things I'll end up having to support though :P This is why Windows keeps winning.
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