There are not that many compiler generated instructions both for X32 or X64 if you look at it by percentage of code. You have to look up the manual for rare instructions no matter what, you hardly need to read maybe a dozen pages to know enough to understand the common operations and control flow. My argument if you start with the current arch, that will be your frame of reference instead of X32 (why not X16 if earlier is better?)
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There are not that many compiler generated instructions both for X32 or X64 if you look at it by percentage of code. You have to look up the manual for rare instructions no matter what, you hardly need to read maybe a dozen pages to know enough to understand the common operations and control flow. My argument if you start with the current arch, that will be your frame of reference instead of X32 (why not X16 if earlier is better?)