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Re: ipa vrp implementation in gcc

Vivek Pandya

On Mon, Jan 18, 2016 at 11:35 AM, vivek pandya <> wrote:
> Vivek Pandya
> On Mon, Jan 18, 2016 at 4:16 AM, Kugan
> <> wrote:
>> > Hello I am Vivek Pandya, I am actually working on a GSoC 2016 proposal
>> > for his work and it is very similar to extending ipa-cp pass. I am also
>> > in touch with Jan Hubicka.
>> Hi Vivek,
>> Glad to know that you are planning to work on this. Could you please put
>> you plan in an accessible place (or post it here) so that we know what
>> you plans are. That way we can work on what you are not working. And
>> also possible contribute to your plan in other ways (like testing and
>> reviewing).
> Hello Kugan,
> Actually my work will include extending the ipa-cp pass to propagate
> range information and then integrating this information to improve LTO
> optimizations (at-least one). But as mentioned by Jan Hubicka the real
> problem is not to extend ipa-cp pass but tree-vrp it self a big task
> and scheduling it at early stage will cost a performance lose.
> So actually I was looking at some alternatives to Patterson's approach
> and particularly I found this non iterative method:
> which has
> already implemented in LLVM
> .

Also please some one suggest me wether this non iterative method will
be good to have as alternative VRP or not ? i.e will it serve our
purpose of light weight VRP to be used at earlier stage ??

> So my plan for this is first implementing above mentioned approach
> till 23 May , 2016 (My college project ) and then use this local pass
> for Value range analysis and then in my GSoC 2016 project I will use
> this pass for ipa-vrp pass and improving other ipa optimizations to
> use this information.
> Though in particular I have yet not figured implementation details.
> Currently I am learning about gcc IRs.
> If you have any further idea ( specially about constraints based
> method ) please let me know and help building my implementation
> approach.
> Sincerely,
> Vivek
>> Thanks,
>> Kugan

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