[all-commits] [llvm/llvm-project] 2f5512: [VPlan] Handle early exit before forming regions. ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2f55123cbb52a4c845a8d9ff837d8be90968175c
      https://github.com/llvm/llvm-project/commit/2f55123cbb52a4c845a8d9ff837d8be90968175c
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-12 (Mon, 12 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/unittests/Transforms/Vectorize/VPlanTestBase.h

  Log Message:
  -----------
  [VPlan] Handle early exit before forming regions. (NFC) (#138393)

Move early-exit handling up front to original VPlan construction, before
introducing early exits.

This builds on https://github.com/llvm/llvm-project/pull/137709, which
adds exiting edges to the original VPlan, instead of adding exit blocks
later.

This retains the exit conditions early, and means we can handle early
exits before forming regions, without the reliance on VPRecipeBuilder.

Once we retain all exits initially, handling early exits before region
construction ensures the regions are valid; otherwise we would leave
edges exiting the region from elsewhere than the latch.

Removing the reliance on VPRecipeBuilder removes the dependence on
mapping IR BBs to VPBBs and unblocks predication as VPlan transform:
https://github.com/llvm/llvm-project/pull/128420.

Depends on https://github.com/llvm/llvm-project/pull/137709 (included in
PR).

PR: https://github.com/llvm/llvm-project/pull/138393



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