[all-commits] [llvm/llvm-project] b263c0: [VPlan] Move predication to VPlanTransform (NFC). ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b263c08e1a0b54a871915930aa9a1a6ba205b099
      https://github.com/llvm/llvm-project/commit/b263c08e1a0b54a871915930aa9a1a6ba205b099
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-21 (Wed, 21 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/CMakeLists.txt
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    A llvm/lib/Transforms/Vectorize/VPlanPredicator.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/unittests/Transforms/Vectorize/VPlanTestBase.h

  Log Message:
  -----------
  [VPlan] Move predication to VPlanTransform (NFC). (#128420)

This patch moves the logic to predicate and linearize a VPlan to a
dedicated VPlan transform. It mostly ports the existing logic directly.

There are a number of follow-ups planned in the near future to
further improve on the implementation:
* Edge and block masks are cached in VPPredicator, but the block masks
are still made available to VPRecipeBuilder, so they can be accessed
during recipe construction. As a follow-up, this should be replaced by
adding mask operands to all VPInstructions that need them and use that
during recipe construction.
* The mask caching in a map also means that this map needs updating each
time a new recipe replaces a VPInstruction; this would also be handled
by adding mask operands.


PR: https://github.com/llvm/llvm-project/pull/128420



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