[openrisc] cpu extensibility

[paul <paulw@mmail.ath.cx>]

Hi

Does the current OPENRISC structure (implementation), make adding new 
instructions easy?
What I have in mind is to add instructions that can't be done in few 
cycles but a lot of cycles.
Specifically, can I add a new instruction say -- that would do big 
number multiplication , or do operations on a big chuck of memory, etc? 
The C compiler don't have to know about the instructions, it will be 
embedded assembly codes in C code.
Can it be done easily?
Thanks.



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