[all-commits] [llvm/llvm-project] 620e01: [VPlan] Don't add live-outs if scalar epilogue is ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 620e011a2506c49d3ce6bdd77b9d17bef5edcf03
      https://github.com/llvm/llvm-project/commit/620e011a2506c49d3ce6bdd77b9d17bef5edcf03
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2023-04-09 (Sun, 09 Apr 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/test/Transforms/LoopVectorize/loop-form.ll

  Log Message:
  -----------
  [VPlan] Don't add live-outs if scalar epilogue is required.

Instead of clearing live outs when a scalar epilogue is required late,
don't add live outs during VPlan construction if a scalar epilogue is
required.

This enables more VPlan-based DCE (if the live out would be the only
user in the plan) and is a step towards removing an access of the cost
model in fixedVectorizedLoop (which is after VPlan execution).

Depends on D147468.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D147471