[PATCH] D97290: [LoopInterchange] Replace tightly-nesting-ness check with the one from `LoopNest`
Ta-Wei Tu via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 23 07:07:21 PST 2021
TaWeiTu created this revision.
TaWeiTu added reviewers: Whitney, fhahn.
Herald added a subscriber: hiraditya.
TaWeiTu requested review of this revision.
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Herald added a subscriber: llvm-commits.
The check `tightlyNested()` in `LoopInterchange` is similar to the one in `LoopNest`.
In fact, the former misses some cases where loop-interchange is not feasible and results in incorrect behaviour.
Replacing it with the much robust version provided by `LoopNest` reduces code duplications and fixes https://bugs.llvm.org/show_bug.cgi?id=48113.
`LoopInterchange` has a weaker definition of tightly or perfectly nesting-ness than the one implemented in `LoopNest::arePerfectlyNested()`.
Therefore, `tightlyNested()` is instead implemented with `LoopNest::checkLoopsStructure` and additional checks for unsafe instructions.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D97290
Files:
llvm/include/llvm/Analysis/LoopNestAnalysis.h
llvm/lib/Analysis/LoopNestAnalysis.cpp
llvm/lib/Transforms/Scalar/LoopInterchange.cpp
llvm/test/Transforms/LoopInterchange/pr48113.ll
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