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Though I don't do much assembly for the stock standard PC (though I've done some work with microcontrollers) it may be a good idea make sure things run on 32bit and 64bit machines if any library is made. Endian correctness too, if applicable. Most of that can be done with #defines. I haven't come across many endian problems (except where forgetting about network data conversions), though I have had some with getting really useful libraries working under a 64bit environment.
Note that I only had a brief look at the code posted earlier, so dunno if any of that applies; I'm posting more as a general comment.