[cfe-dev] [LLVMdev] About commit TILE-Gx backend to community repository and default disabled

Jiong Wang jiwang at tilera.com
Sat Mar 23 02:51:15 PDT 2013

on 2013/3/23 1:52, Chris Lattner wrote:
> On Mar 19, 2013, at 8:58 PM, Jiong Wang <jiwang at tilera.com> wrote:
>> Hi Chris,
>> could you please comment on committing TILE-Gx backend into community?
> Hi Jiong,
> I don't have any special advice here.  It sounds like the general functionality level is high enough.  Taking it into mainline sounds great, so long as it is reviewed by someone.


   I will commit after rebasing & re-testing the code on latest llvm 
mainline. And I will follow http://llvm.org/docs/HowToAddABuilder.html 
to setup a TILE-Gx buildbot.

Tilera Corporation.

> -Chris
>> ========== TILE-Gx Status ===========
>> Features Supported
>> ===
>> 1. general function.
>> 2. PIC/TLS/JumpTable.
>> 3. Instructoin Bundling for VLIW.
>> 4. Asm Parser
>> 5. MC Layer (aware of instruction bundle), MCJIT support.
>> 6. Initial regression tests for CodeGen & MC Layer.
>> Regression Result
>> ===
>> Expected Passes : 13363
>> Expected Failures : 84
>> Unsupported Tests : 76
>> Unexpected Failures: 21
>> 20 of the unexpected failures are caused by lack of old jit support.
>> Test-Suite Result
>> ===
>> Expected Passes : 953
>> Unexpected Failures: 14
>> (all 14 failures has the same output as tilegx gcc,
>> most of them are about float precision issue)
>> 于 2013/3/16 2:37, Tom Stellard 写道:
>>> On Fri, Mar 15, 2013 at 05:38:28PM +0800, Jiong Wang wrote:
>>>> Hi Chandler,
>>>> on 2013/3/15 17:15, Chandler Carruth wrote:
>>>>> On Fri, Mar 15, 2013 at 1:54 AM, Jiong Wang <jiwang at tilera.com
>>>>> <mailto:jiwang at tilera.com>> wrote:
>>>>>     I agree that everyone should contribute to keep the community
>>>>>     active and vigorious. But I think there are difference between
>>>>>     contributors.
>>>>>        some are focused and with expertise on middle end, while others
>>>>>     may on front or back end. so the normal way for a new contributor
>>>>>     is, find a familiar point to start, then go deeper and wider and
>>>>>     expand one's contribution during this process.
>>>>>        For Tilera corporation and me, we would like the keep tilegx
>>>>>     backend actively maintained and improved, and wish it could be a
>>>>>     good target to improve and test VLIW, many core features etc.
>>>>> Inevitably, if you care about LLVM's support for your platform,
>>>>> you will care about bugs and features in the target-independent
>>>>> stack of LLVM's software (including the target independent parts
>>>>> of Clang, etc). There will be bugs which are priorities only for
>>>>> you and/or your users, features most pressing only for you or your
>>>>> users, etc. As such, it seems likely that you will need at least a
>>>>> basic working familiarity with the stack, and the ability to
>>>>> improve it in at least basic ways. Simple things like finding and
>>>>> fixing bugs in the target independent code generator, improving
>>>>> DAG combine optimizations, or looking for compile time hotspots
>>>>> are almost always approachable by nearly anyone on the project.
>>>>      I am not quite understand your points here, for a backend
>>>> maintainer, of course, these things are daily work.
>>>>> Essentially, you don't need to invent a new middle end
>>>>> optimization, or improve the subtleties of our alias analysis.
>>>>> Most of LLVM, and most of our bugs/missing features/areas for
>>>>> improvement, involve straightforward C++ code and systems that
>>>>> anyone who cares can go in, hack, and improve. That's what
>>>>> occupies the majority of the maintenance work as it happens. There
>>>>> is relatively little deeply detailed work requiring specialized
>>>>> knowledge.
>>>>      Anyway, my question is "how could tilegx backend included in
>>>> community repository?", I am here to seek answer for this. I
>>>> searched mailinglist archive, and learned R600 and AArch64's request
>>>> post, but find few things.
>>> Hi Jiong,
>>> I am the maintainer of the R600 backend so I have some experience trying to
>>> get a new backend included in the community repository.
>>> My recommendation is to contact the project lead, Chris Lattner,
>>> directly and point him to the reviews that have already been done and ask
>>> him specifically what you need to do to get the backend approved.
>>> There is no formal process in place for adding a new backend, and I
>>> think if you keep posing your question to the list you will have trouble
>>> getting a clear answer on what needs to be done
>>> -Tom
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