Re: Guidelines for instruction set design?

On Apr 30, 9:25 pm, cyril.cress...@gmail.com wrote:
> Hello,
>
> I'm currently trying to port LCC to a custom CPU implemented in a
> FPGA. A different person is designing the hardware and instruction
> set.
>
> I was wondering if there are some general guidelines one should
> observe when designing an instruction set so that a C compiler can
> easily be ported to that CPU.


Did you mean that the C compiler should be able to generate optimal
code for the given architecture? If yes or even otherwise -the best
instruction set (proven over the years) is RISC. You can use the MIPS
instruction set free of royalty (in case its a for-profit
implementation) as long as you use only integer operations.


FYI -Pentium/AMD Opteron provides the x86 instruction set for
compatibility reasons, but the x86 instructions are translated to RISC
instructions before they are executed.
[Not really. -John]


> I'm asking because I'm having a hard time porting LCC with the current
> instruction set of our custom CPU.
>
> I've already searched in this group's archive but I couldn't find an
> answer.
>
> I can provide more information on our current instruction set if it
> helps you answer my question, though I don't think it's revelant here.


the current instruction set is not required, but you may want to
elaborate on what exactly is the problem faced by you as of now.


thanks
-kamal

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