[llvm-dev] [GSoC 2021] Utilize LoopNest Pass

[Whitney T Tsang via llvm-dev]

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



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


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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, Ettore

  On Tue, Mar 9, 2021, 3:00 AM uint256_t via llvm-dev <
  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
   https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

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