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legacy RISC mode? last time I checked it was called the ARM mode, which is the absolute standard.

Thumb has benefits, but there are also limitations which is why I wouldn't call it a replacement.



Not anymore - Thumb2 is the new standard and supports everything that ARM does (at least, the last I read it did).

One of the big differences is that you now need a marker instruction for predicated sequences, but obviously the encoding is quite different.




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