asm: add num_registers_available()
#11714
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This change adds a way to inspect how many registers an instruction can address. We assume for now that legacy instructions can always emit the REX prefix and thus access 16 registers; thus, the only encoding that allows access to 32 registers is EVEX. This also refactors some of the top-level generation logic to be less verbose.
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This change adds a way to inspect how many registers an instruction can address. We assume for now that legacy instructions can always emit the REX prefix and thus access 16 registers; thus, the only encoding that allows access to 32 registers is EVEX.
This also refactors some of the top-level generation logic to be less verbose.