[all-commits] [llvm/llvm-project] b72689: [LV] Ignore live-out users in cost model if scalar...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b72689a5cbd8645c183476cd87e32948308c5b64
      https://github.com/llvm/llvm-project/commit/b72689a5cbd8645c183476cd87e32948308c5b64
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-25 (Thu, 25 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/dead-ops-cost.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll

  Log Message:
  -----------
  [LV] Ignore live-out users in cost model if scalar epilogue is required.

Follow-up to ba8126b6fef79.

If a scalar epilogue is required, users outside the loop won't use
live-outs from the vector loop but from the scalar epilogue. Ignore them if
that is the case.

This fixes another case where the VPlan-based cost-model more accurately
computes cost.

Fixes https://github.com/llvm/llvm-project/issues/100464.



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