[all-commits] [llvm/llvm-project] ecc354: [Utils] Fix incorrect LCSSA PHI nodes when splitti...

[Camsyn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ecc35456d79aac3fb85fe95e30cdaaca916e8722
      https://github.com/llvm/llvm-project/commit/ecc35456d79aac3fb85fe95e30cdaaca916e8722
  Author: Camsyn <camsyn at foxmail.com>
  Date:   2025-04-03 (Thu, 03 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
    M llvm/unittests/Transforms/Utils/BasicBlockUtilsTest.cpp

  Log Message:
  -----------
  [Utils] Fix incorrect LCSSA PHI nodes when splitting critical edges with MergeIdenticalEdges (#131744)

This PR fixes incorrect LCSSA PHI node generation when splitting
critical edges with both
`PreserveLCSSA` and `MergeIdenticalEdges` enabled. The bug caused PHI
nodes in the split block
to miss predecessors when multiple identical edges were merged.



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