llvm dev - Dec 2020 - [RFC] Backend for Motorola 6800 series CPU (M68k)

Hi Min!

On 12/4/20 8:32 AM, Min-Yih Hsu wrote:
> Another major update on this topic: currently I’ve addressed most of the
feedbacks
> on the Phabricator patches. (I think only one was left and that’s related
to Windows,
> but since our own buildbots only run non-Windows system I think it’s fine
for now)
> 
> More importantly, I’ve fixed rest of the test failures, so now except one
XFAIL test
> case, which takes more time to fix it, M68k passes all of its tests now :-)
> 
> Personally, I think the M68k backend is in good shape to become an
experimental LLVM backend.
> 
> Currently only Patch 7 (D88393) has Renato’s semi-LGTM, and he was also
asking other
> people’s opinion and LGTM. It would be great if anyone can help reviewing
and approving
> these patches.
> 
> The journey of getting M68k backend upstream has gone pretty far and again,
I really
> appreciate feedbacks and helps from reviewers and everyone on this thread!
Congratulations on this important milestone and the fantastic work you
delivered.

I would have never expected that this effort would ever get this far, so I'm
more
than impressed and happy about the news.

The backend is also already actively being used in another project, namely a
compiler
explorer instance which features various compilers for m68k including your LLVM
port [1].

And, secondly, Nick Desaulniers will be giving a short talk on December 18th, on
our
monthly m68k online meeting [2] where he will be talking about compiling the
Linux
kernel for m68k using your new LLVM backend :-).

Adrian
> [1] http://brownbot.mooo.com/
> [2] http://m68k.info/
-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

Hi All,

Another update on this topic: Currently three patches have been approved, thanks
for all reviewers’ time and efforts :-)

Here are the remaining patches:
 - Patch 1/8 D88385: Got one LGTM, however I believe Jessica Clarke (jrtc27)
(CC-ed here) is listed as blocker. Does anyone here know the best way to contact
Jessica? Since the patch has been blocked for quite a long time and pinging
@jrtc27 on Phab didn’t seem to work
 - Patch 3/8 D88389   (Basic .td files)
 - Patch 4/8 D88390   (MC layer)
 - Patch 5/8 D88391   (Target lowering)
 - Patch 6/8 D88392   (IR Tests)

Except Patch 6, which only has minor formatting issues to fix, I didn’t see any
major objections or concerns on other patches at this time point.

In addition to the patch review, tomorrow Dec 18th 19:00 CET (10:00 AM PST),
Nick Desaulniers is going to give a talk on compiling Linux Kernel for M68k
using LLVM.
Please checkout http://m68k.info/ <http://m68k.info/> for more info about
the live stream

Best,
-Min
> On Dec 4, 2020, at 1:03 AM, John Paul Adrian Glaubitz <glaubitz at
physik.fu-berlin.de> wrote:
> 
> Hi Min!
> 
> On 12/4/20 8:32 AM, Min-Yih Hsu wrote:
>> Another major update on this topic: currently I’ve addressed most of
the feedbacks
>> on the Phabricator patches. (I think only one was left and that’s
related to Windows,
>> but since our own buildbots only run non-Windows system I think it’s
fine for now)
>> 
>> More importantly, I’ve fixed rest of the test failures, so now except
one XFAIL test
>> case, which takes more time to fix it, M68k passes all of its tests now
:-)
>> 
>> Personally, I think the M68k backend is in good shape to become an
experimental LLVM backend.
>> 
>> Currently only Patch 7 (D88393) has Renato’s semi-LGTM, and he was also
asking other
>> people’s opinion and LGTM. It would be great if anyone can help
reviewing and approving
>> these patches.
>> 
>> The journey of getting M68k backend upstream has gone pretty far and
again, I really
>> appreciate feedbacks and helps from reviewers and everyone on this
thread!
> 
> Congratulations on this important milestone and the fantastic work you
delivered.
> 
> I would have never expected that this effort would ever get this far, so
I'm more
> than impressed and happy about the news.
> 
> The backend is also already actively being used in another project, namely
a compiler
> explorer instance which features various compilers for m68k including your
LLVM
> port [1].
> 
> And, secondly, Nick Desaulniers will be giving a short talk on December
18th, on our
> monthly m68k online meeting [2] where he will be talking about compiling
the Linux
> kernel for m68k using your new LLVM backend :-).
> 
> Adrian
> 
>> [1] http://brownbot.mooo.com/
>> [2] http://m68k.info/
> 
> -- 
> .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer - glaubitz at debian.org
> `. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
>  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
> 
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