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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

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
To:
Cc: llvm-dev , etiotto@ca.ibm.com, whitneyt@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@gmail.com>: