[PATCH] D87494: [WIP] Improve LSR debug-info

[Markus Lavin via Phabricator via llvm-commits]

markus updated this revision to Diff 291534.
markus added a reviewer: aprantl.
markus added a comment.
Herald added a subscriber: ormris.

Change of appraoch. Instead of hooking into `deleteDeadPHIs` with an `AboutToDeleteCallback` we do a pre-pass to store a way the `llvm.dbg.value` of the loop as well as their SCEV expressions. After LSR has done its thing we go through those stored away `llvm.dbg.value` and if any of them now has an `undef` variable location we try to update it using its stored SCEV.

At least this way is clean and simple.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87494/new/

https://reviews.llvm.org/D87494

Files:
  llvm/include/llvm/Analysis/ScalarEvolution.h
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/test/DebugInfo/COFF/fpo-shrink-wrap.ll
  llvm/test/Transforms/LoopStrengthReduce/dbg-preserve-0.ll

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