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If I understand this correctly:
Current CPU developing companies like AMD and Intel have their own API codes (the assembly language) as what they see as the 2G language on top of the Machine code (1G language)
Would it be possible or desirable (performance or otherwise) to have a CPU that would perform IL handling at it’s core instead of the current API calls?
A similar technology does exist for Java – ARM do a range of CPUs that can do this, they call it their ‘Jazelle’ technology.
However, the operations represented by .net IL opcodes are only well-defined in combination with the type information held on the stack, not on their own. This is a major difference from Java bytecode, and would make it much more difficult to create sensible hardware to execute IL.
Moreover, IL is intended for compilation to a final target. Most back ends that spit out IL do very little optimisation, aiming instead to preserve semantic content for verification and optimisation in the final compilation step. Even if the hardware problems could be overcome, the result will almost certainly still be slower than a decent optimising JIT.
So, to sum up: while it is not impossible, it would be disproportionately hard compared to other architectures, and would achieve little.