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Split bytecodes into micro-ops #592

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@gvanrossum

For various reasons the Tier 2 optimizer and interpreter prefer to have an instruction format that only contains one argument per instruction -- the argument can be either the opcode or a cache value.

This is a substantial task, but luckily we can parallelize it.

I expect that we'll find we need some improvements to the generator, to ensure that the original bytecodes (which become macro-instructions) are as efficient as their original version.

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    epic-generatorDSL-based code generator for the interpreter(s)epic-tier2-optimizerLinear code region optimizer for 3.13 and beyond.

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