[all-commits] [llvm/llvm-project] 5fae40: [VPlan] Dispatch to multiple exit blocks via middl...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5fae408d3a4c073ee43aec9906fa44ffe4026301
      https://github.com/llvm/llvm-project/commit/5fae408d3a4c073ee43aec9906fa44ffe4026301
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M llvm/docs/Vectorizers.rst
    A llvm/docs/vplan-early-exit.dot
    A llvm/docs/vplan-early-exit.png
    M llvm/include/llvm/Transforms/Vectorize/LoopVectorizationLegality.h
    M llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/test/Transforms/LoopVectorize/early_exit_legality.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit.ll
    A llvm/test/Transforms/LoopVectorize/uncountable-early-exit-vplan.ll
    M llvm/test/Transforms/LoopVectorize/unsupported_early_exit.ll

  Log Message:
  -----------
  [VPlan] Dispatch to multiple exit blocks via middle blocks. (#112138)

A more lightweight variant of
https://github.com/llvm/llvm-project/pull/109193,
which dispatches to multiple exit blocks via the middle blocks.

The patch also introduces a bit of required scaffolding to enable
early-exit vectorization, including an option. At the moment, early-exit
vectorization doesn't come with legality checks, and is only used if the
option is provided and the loop has metadata forcing vectorization. This
is only intended to be used for testing during bring-up, with @david-arm
enabling auto early-exit vectorization plugging in the changes from
https://github.com/llvm/llvm-project/pull/88385.

PR: https://github.com/llvm/llvm-project/pull/112138



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