[all-commits] [llvm/llvm-project] cd3bfc: [SCEV] Preserve LCSSA when reusing dominating vari...

[Aiden Grossman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cd3bfc1f992612aff5df2c5d6c73d1c08a185880
      https://github.com/llvm/llvm-project/commit/cd3bfc1f992612aff5df2c5d6c73d1c08a185880
  Author: Aiden Grossman <aidengrossman at google.com>
  Date:   2026-06-22 (Mon, 22 Jun 2026)

  Changed paths:
    M llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
    M llvm/test/Transforms/LoopStrengthReduce/X86/lcssa-preservation-regression.ll

  Log Message:
  -----------
  [SCEV] Preserve LCSSA when reusing dominating variable

This seems to just be a missing case in SCEV. This came up when looking
at making LSR preserve LCSSA for the NewPM. Regression test of that
nature has been added.

Reviewers: fhahn, nikic, arsenm

Pull Request: https://github.com/llvm/llvm-project/pull/192831



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