Hello,
I have a question about finding good passes for utilizing LoopNest pass.
> The LoopFullUnrollPass is not a good candidate for the change, as it is a
loop pass and it is being used as a loop pass.
Then you mean that passes which are implemented as not a loop pass (function
pass) and not already used as a loop pass are good for this
change?
I didn't get that. Could you tell me why it is?
Thanks in advance,
Toshiki Maekawa
On Fri, Mar 12, 2021, 1:20 AM uint256_t <konndennsa at gmail.com> wrote:
> Thank you for your advice. As you mentioned, LoopUnrollAndJam seems to be
> a good candidate.
> I'm going to find another analyse/transform pass suitable for loop nest
> pass.
>
> Best,
> Toshiki Maekawa
>
> 2021年3月10日(水) 23:32 Whitney T Tsang <whitneyt at ca.ibm.com>:
>
>> Sure, in this project, we plan to utilize the LoopNest pass in some
>> existing passes.
>> As an example, here is one of the patches to transform the loop
>> interchange pass: https://reviews.llvm.org/D97847.
>> On top of doing the code changes, we want to understand what are the
pros
>> and cons of the change.
>> We can do that by collecting some data, e.g. compile time.
>>
>> There are two loop unroller, LoopFullUnrollPass and LoopUnrollPass.
>> The LoopFullUnrollPass is not a good candidate for the change, as it is
a
>> loop pass and it is being used as a loop pass.
>> It is written to be traverse from inner to outer loop, with other loop
>> transformations in between in the loop pipeline.
>> The LoopUnrollPass could be a candidate, but the LoopUnrollAndJamPass
can
>> be an easier to understand candidate,
>> as unroll and jam transformation naturally operate on more than one
loop
>> (LoopNest).
>>
>> Regards,
>> Whitney Tsang
>>
>> [image: Inactive hide details for uint256_t ---2021/03/10 07:52:17
>> AM---I'm glad to get in touch with you two. I'm planning to
utilize]uint256_t
>> ---2021/03/10 07:52:17 AM---I'm glad to get in touch with you two.
I'm
>> planning to utilize LoopNest pass for some passes like lo
>>
>> From: uint256_t <konndennsa at gmail.com>
>> To:
>> Cc: llvm-dev <llvm-dev at lists.llvm.org>, etiotto at ca.ibm.com,
>> whitneyt at ca.ibm.com
>> Date: 2021/03/10 07:52 AM
>> Subject: [EXTERNAL] Re: [llvm-dev] [GSoC 2021] Utilize LoopNest Pass
>> ------------------------------
>>
>>
>> ZjQcmQRYFpfptBannerEnd
>> I'm glad to get in touch with you two.
>> I'm planning to utilize LoopNest pass for some passes like loop
unrolling.
>> Could you tell me more about this project if any?
>>
>> 2021年3月9日(火) 20:47 Whitney Tsang <*whitney.uwaterloo at gmail.com*
>> <whitney.uwaterloo at gmail.com>>:
>>
>> + Whitney, Ettore
>>
>> On Tue, Mar 9, 2021, 3:00 AM uint256_t via llvm-dev <
>> *llvm-dev at lists.llvm.org* <llvm-dev at lists.llvm.org>>
wrote:
>> Hello,
>>
>> I'm thinking of participating in GSoC at LLVM.
>> I've already talked about ideas with some project mentors but a
newly
>> added project idea "Utilize LoopNest Pass" attracted me.
>> I want to get in touch with its mentors (Whitney Tsang, Ettore
>> Tiotto), whose email I couldn't find out.
>>
>> Sincerely,
>> Toshiki Maekawa
>> _______________________________________________
>> LLVM Developers mailing list
>> *llvm-dev at lists.llvm.org* <llvm-dev at lists.llvm.org>
>> *https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev*
>>
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>>
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