> On Apr 22, 2020, at 10:11 PM, Senthil Kumar via Gcc <gcc@gcc.gnu.org> wrote:
>
> On Wed, Apr 22, 2020 at 10:08 PM Jeff Law <l...@redhat.com> wrote:
>>
>> On Wed, 2020-04-22 at 22:01 +0530, Senthil Kumar via Gcc wrote:
>>> Hi,
>>>
>>> I'm thinking about attempting to do the CC0 transition for the
>>> AVR port in my spare time. I've read the CC0Transition gcc wiki
>>> page, and as the AVR ISA does not have non-condition-code
>>> clobbering arithmetic instructions, concluded that I'd have to
>>> follow the steps outlined for case #2.
>>>
>>> Are there any other things I need to watch out for?
>> Not offhand. You might want to look at how Bernd did the m68k though. I
>> think a
>> conceptually similar transition would be reasonable for AVR as well as the
>> alternative would be dropping the AVR port.
Last year I did the CC0 conversion for pdp11, which is another case #2
architecture, and a pretty simple one for the most part. I followed the Wiki
fairly closely, with help from Eric. One thing that may not be relevant is
that pdp11 has two CCREGS, one for float, one for integers.
paul
