[all-commits] [llvm/llvm-project] 07292b: [LIR][SCEVExpander] Restore original flags when ab...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 07292b7203e31fb90d9180bfccde0d4e84be2245
      https://github.com/llvm/llvm-project/commit/07292b7203e31fb90d9180bfccde0d4e84be2245
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-02-21 (Wed, 21 Feb 2024)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
    M llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
    M llvm/test/Transforms/LoopIdiom/pr82337.ll

  Log Message:
  -----------
  [LIR][SCEVExpander] Restore original flags when aborting transform (#82362)

SCEVExpanderCleaner will currently remove instructions created by
SCEVExpander, but not restore poison generating flags that it may have
dropped. As such, running LIR can currently spuriously drop flags
without performing any transforms.

Fix this by keeping track of original instruction flags in SCEVExpander.

Fixes https://github.com/llvm/llvm-project/issues/82337.



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