[cc65] The most critical operations of the C runtime

Hello,

as some of you might remember, I'm writing a 6502 Virtual Machine.

I was thinking about accelerating the most critical routines of the C runtime.

The idea is NOT to extend the CPU with custom opcodes, but to use the IO chip.

Something like this:

runtime_operation:
	STA CC65OP1 ; operand 1, if necessary
	STX CC65OP2 ; operand 2, if necessary
	LDX #CC65_???
	STX CC65OPC ; operation code; triggers operation
	LDA CC65RES ; operation result, if necessary
	RTS

I have no access to the CPU registers, but I have access to the memory
and I can assume a specific layout for page 0.I cannot bloat the code
of the IO chip too much; ideally I'm looking for 5-10 operations to
accelerate.

Does it make sense or do you think that the the most critical
operations are so short that the overhead would be too big anyway?

Thanks,
Emanuele
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