Re: [f-cpu] latest gcc & immediate addressing [Was: BOUNCE f-cpu@seul.org:...] (fwd)

[Michael Riepe <michael@stud.uni-hannover.de>]

On Thu, Jan 09, 2003 at 05:47:33AM +0000, cedric wrote:
[...]
> > > >     - logic operations take 9-bit signed immediate operands.
[...]

> Hum, I have a problem here, I don't find any empty room for that in our ISA. 
> How did you implement it, by using some of the OP_CODE bits ?

The manual entry for ROP2 operations is way out of date; the encoding is
different now (uses eight opcodes instead of one). The function is encoded
in bits 26-24, bits 20-12 hold the (sign-extended) immediate operand.

-- 
 Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
 "All I wanna do is have a little fun before I die"
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