dacaw, good luck with the assembler port! It has been too many years since I programmed assembler, I don't know what tools are available to help. Of course assembler will require significant manual recoding, but I'd think there should be some automated tools to do a first pass on the code, converting 32-bit instruction sections to equivalent 64-bit and maybe even reassigning some registers.
Maybe that wouldn't be practical. The time saved through automated conversions would have to be more than the time spent fixing mistakes and optimizing design for performance (any code automatically generated which conflicted with a re-design would have to be dumped anyhow).
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