[all-commits] [llvm/llvm-project] d56dee: [VPlan] Connect Entry to scalar preheader during i...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d56deea1e4fb16bdf2789fe1b9a18084f42fd933
      https://github.com/llvm/llvm-project/commit/d56deea1e4fb16bdf2789fe1b9a18084f42fd933
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-27 (Tue, 27 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-forced.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-widen-gep.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve2-histcnt-vplan.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/synthesize-mask-for-call.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/vplan-printing.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/widen-call-with-intrinsic-or-libfunc.ll
    M llvm/test/Transforms/LoopVectorize/PowerPC/vplan-force-tail-with-evl.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vplan-vp-intrinsics-fixed-order-recurrence.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vplan-vp-intrinsics-reduction.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-chains-vplan.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
    M llvm/test/Transforms/LoopVectorize/icmp-uniforms.ll
    M llvm/test/Transforms/LoopVectorize/interleave-and-scalarize-only.ll
    M llvm/test/Transforms/LoopVectorize/uncountable-early-exit-vplan.ll
    M llvm/test/Transforms/LoopVectorize/vplan-dot-printing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-iv-transforms.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-before-execute.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-reductions.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge-vf1.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll
    M llvm/test/Transforms/LoopVectorize/vplan-unused-interleave-group.ll
    M llvm/test/Transforms/LoopVectorize/vplan-widen-struct-return.ll
    M llvm/unittests/Transforms/Vectorize/VPlanHCFGTest.cpp
    M llvm/unittests/Transforms/Vectorize/VPlanSlpTest.cpp

  Log Message:
  -----------
  [VPlan] Connect Entry to scalar preheader during initial construction. (#140132)

Update initial construction to connect the Plan's entry to the scalar
preheader during initial construction. This moves a small part of the
 skeleton creation out of ILV and will also enable replacing
 VPInstruction::ResumePhi with regular VPPhi recipes.

Resume phis need 2 incoming values to start with, the second being the
bypass value from the scalar ph (and used to replicate the incoming
value for other bypass blocks). Adding the extra edge ensures we
incoming values for resume phis match the incoming blocks.

PR: https://github.com/llvm/llvm-project/pull/140132



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