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

[uint256_t via llvm-dev]

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
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