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MIPS did it too with the MIPS16 extension (https://en.wikipedia.org/wiki/MIPS_architecture#Application-...)

Makes sense as a hardware designer to be able to pick a power- and space-efficient chip.

Mashey also had thoughts about that: https://yarchive.net/comp/mips16.html

Likewise for atomic operations: https://yarchive.net/comp/ll_sc.html