[llvm-dev] LLVM bc converter from LLVM 3.9 to LLVM 3.1

[Jakub Kuderski via llvm-dev]

>
> I also have a look at the code, looks like it directly parse the bitcode
> and build in memory representation in a different LLVM version than the
> bitcode. Is this correct?

According to your description, I guess the BitCodeWriter should be the one
> to do the bitcode version downgrade, right?

I think so.

I don't know much about it and don't want to give you misleading
information; I'm cc-ing Stephen.


On 2 August 2016 at 16:53, Hongbin Zheng <etherzhhb at gmail.com> wrote:

> Thanks Jakub. Looks Like I didn't rely all.
>
> I also have a look at the code, looks like it directly parse the bitcode
> and build in memory representation in a different LLVM version than the
> bitcode. Is this correct?
>
> According to your description, I guess the BitCodeWriter should be the
> one to do the bitcode version downgrade, right?
>
> Does this took work on LLVM 3.9svn?
>
> And could you give some hints about how you test the bitcode translator?
>
> Thanks
> Hongbin
>
>
>
>
> On Tue, Aug 2, 2016 at 3:25 PM, Jakub Kuderski <
> kubakuderski+llvm at gmail.com> wrote:
>
>> I'm not sure if it was intended, but I think that you responded only to
>> me (not to the list).
>>
>> Anyway, RenderScript currently uses llvm 3.2 IR as binary
>> representation/exchangeable format, but the llvm version is higher
>> internally. Essentially, there it reads old bitcode and operates on the
>> newer one in memory. When it's done, it's also able to output bitcode in
>> the old format. The corresponding classes should be something like
>> BitCodeReader and BitCodeWriter.
>> The reader/writer is maintained to work with Android's llvm version,
>> which follows upstream llvm version.
>>
>> I haven't worked on it myself, but if you have some specific questions, I
>> should be able to point you to appropriate people.
>>
>> Regards
>>
>> On 2 August 2016 at 15:17, Hongbin Zheng <etherzhhb at gmail.com> wrote:
>>
>>> Hi Jakub,
>>>
>>> Thanks a lot. Do you have any document about this tool? or could you
>>> gave me a rough idea what it do?
>>>
>>> Thanks
>>> Hongbin
>>>
>>> On Tue, Aug 2, 2016 at 3:06 PM, Jakub Kuderski <
>>> kubakuderski+llvm at gmail.com> wrote:
>>>
>>>> Hi Hongbin,
>>>>
>>>> Android's RenderScript uses a tool like that. You can find the sources
>>>> here:
>>>> https://android.googlesource.com/platform/frameworks/compile/libbcc/+/master/bcinfo/
>>>>  .
>>>>
>>>> Best,
>>>> Jakub
>>>>
>>>>
>>>> On 2 August 2016 at 11:10, Hongbin Zheng via llvm-dev <
>>>> llvm-dev at lists.llvm.org> wrote:
>>>>
>>>>> Hi mailing list,
>>>>>
>>>>> I has been working on a large project that is based on LLVM 3.1.
>>>>> Recently we are thinking to introduce an LLVM bc converter from LLVM 3.9 to
>>>>> LLVM 3.1, such that we can introduce some of the newest LLVM analyses and
>>>>> optimizations to our  LLVM 3.1 based project.
>>>>>
>>>>> Have you worked on similar things that converting LLVM bc downward and
>>>>> has anything to share?
>>>>>
>>>>> Thanks
>>>>> Hongbin
>>>>>
>>>>> _______________________________________________
>>>>> LLVM Developers mailing list
>>>>> llvm-dev at lists.llvm.org
>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>>>
>>>>>
>>>>
>>>
>>
>
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