[all-commits] [llvm/llvm-project] 528b13: [SCEVExp] Add helper to clean up dead instructions...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 528b13df571c86a2c5b8305d7974f135d785e30f
      https://github.com/llvm/llvm-project/commit/528b13df571c86a2c5b8305d7974f135d785e30f
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-09-08 (Mon, 08 Sep 2025)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
    M llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-branches-cost.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/predicated-costs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-cost.ll
    M llvm/test/Transforms/LoopVectorize/PowerPC/optimal-epilog-vectorization.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll
    M llvm/test/Transforms/LoopVectorize/X86/cost-model.ll
    M llvm/test/Transforms/LoopVectorize/X86/interleave-cost.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr35432.ll
    M llvm/test/Transforms/LoopVectorize/interleaved-accesses-requiring-scev-predicates.ll
    M llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization.ll
    M llvm/test/Transforms/LoopVectorize/pr34681.ll
    M llvm/test/Transforms/LoopVectorize/pr37248.ll
    M llvm/test/Transforms/LoopVectorize/reverse_induction.ll
    M llvm/test/Transforms/LoopVectorize/runtime-check-small-clamped-bounds.ll
    M llvm/test/Transforms/LoopVectorize/scev-predicate-reasoning.ll
    M llvm/test/Transforms/LoopVectorize/vplan-native-path-inner-loop-with-runtime-checks.ll

  Log Message:
  -----------
  [SCEVExp] Add helper to clean up dead instructions after expansion. (#157308)

Add new helper to erase dead instructions inserted during SCEV expansion
but not being used due to InstSimplifyFolder simplifications.

Together with https://github.com/llvm/llvm-project/pull/157307 this also
allows removing some specialized folds, e.g.
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp#L2205

PR: https://github.com/llvm/llvm-project/pull/157308



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