[oc] or1k instruction set.

[Andre <george@armcc.org>]

I just heard about this project today and would like to offer any help I
can. I know quite a bit about the MIPS architecture and a bit about the
ARM as well so hopefully I can be of some use.

Anyway, as it seems the or1k source has been pulled for the time being
(any guesses about when it might be back ?) I've had a quick look
through the preliminary ISA document instead. I know its only a draft,
but I noticed the following:

h.jal is listed twice (pages 61 and 62)

l.subi32s probably isn't needed - a compiler could use the l.addi32s
instruction and swap the sign. (MIPS has ADDI and ADDIU, but no subtract
immediate instructions).

andre
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