Guidelines for instruction set design?

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.


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.


Cyril
[Interesting question. C should be pretty straightforward on anything
with flat byte addressing and enough registers to handle stack frames.
What makes this architecture hard? -John]

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