One particular thing that I keep seeing come up: it would be highly advantageous for the ISA to declare "after a jump, certain registers are clobbered". This sh

One particular thing that I keep seeing come up: it would be highly advantageous for the ISA to declare "after a jump, certain registers are clobbered". This should certainly include flags (at least, the arithmetic kind - clearly, things like DF/IF/TF are fundamentally a different kind of state even if the (rare!) explicit get-flags and set-flags instructions include both), but there's a decent argument that a couple accumulator-like registers should also be clobbered (but not if used for the RETURN value). Resumable instructions are clearly also a big deal.