[all-commits] [llvm/llvm-project] 578504: [VPlan] Add VPIRBasicBlock, use to model pre-prehe...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5785048321ab82d18667655681d871f7cdc357e5
      https://github.com/llvm/llvm-project/commit/5785048321ab82d18667655681d871f7cdc357e5
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-05-30 (Thu, 30 May 2024)

  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/lib/Transforms/Vectorize/VPlanVerifier.cpp
    M llvm/unittests/Transforms/Vectorize/VPlanTestBase.h

  Log Message:
  -----------
  [VPlan] Add VPIRBasicBlock, use to model pre-preheader. (#93398)

This patch adds a new special type of VPBasicBlock that wraps an
existing IR basic block. Recipes of the block get added before the
terminator of the wrapped IR basic block. Making it a subclass of
VPBasicBlock avoids duplicating various APIs to manage recipes in a
block, as well as makes sure the traversals filtering VPBasicBlocks
automatically apply as well.

Initially VPIRBasicBlock are only used for the pre-preheader (wrapping
the original preheader of the scalar loop).

As follow-up, this will be used to move more parts of the skeleton
inside VPlan, starting with the branch and condition in the middle
block.

Separated out of https://github.com/llvm/llvm-project/pull/92651

PR: https://github.com/llvm/llvm-project/pull/93398



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