spec/iasm.dd: Expand definition of Register and Register64 #3051
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These were previously defined as a set of tokens loosely arranged in a table. Unfortunately, this layout was ambiguous, and if interpreted literally (or by a program) in the same way as the rest of the grammar, they would mean that the tokens on the same line actually have to appear one after another in the source file in the specified order.
As such, we have to sacrifice a bit of human-readability to achieve machine readability. If necessary, the former can be later improved using CSS or additional macros, such as
MULTICOLS
.