[all-commits] [llvm/llvm-project] ddffb7: [LV] Strip unreachable SCEV-check blocks (#130079)

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ddffb74afd870d284ba07f1cf6c67117a8ab8b33
      https://github.com/llvm/llvm-project/commit/ddffb74afd870d284ba07f1cf6c67117a8ab8b33
  Author: Ramkumar Ramachandra <ramkumar.ramachandra at codasip.com>
  Date:   2025-03-06 (Thu, 06 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-branches-cost.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr36524.ll

  Log Message:
  -----------
  [LV] Strip unreachable SCEV-check blocks (#130079)

emitSCEVChecks checks if SCEVCheckCond matches zero, and returns
nullptr. However, it sets SCEVCheckCond as used before it does this,
which prevents it from being removed during cleanup, resulting in
unreachable blocks being emitted. Fix this.



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