[all-commits] [llvm/llvm-project] f48884: [VPlan] Remove loop region in optimizeForVFAndUF. ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f48884ded884d982a7fd13394b0e93e6588f4143
      https://github.com/llvm/llvm-project/commit/f48884ded884d982a7fd13394b0e93e6588f4143
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-01-05 (Sun, 05 Jan 2025)

  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/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/call-costs.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/low-trip-count.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/short-trip-count.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/truncate-to-minimal-bitwidth-cost.ll
    M llvm/test/Transforms/LoopVectorize/SystemZ/pr47665.ll
    M llvm/test/Transforms/LoopVectorize/SystemZ/scalar-steps-with-users-demanding-all-lanes-and-first-lane-only.ll
    M llvm/test/Transforms/LoopVectorize/X86/constant-fold.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr34438.ll
    M llvm/test/Transforms/LoopVectorize/debugloc-optimize-vfuf-term.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
    M llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination.ll
    M llvm/test/Transforms/LoopVectorize/version-stride-with-integer-casts.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-before-execute.ll

  Log Message:
  -----------
  [VPlan] Remove loop region in optimizeForVFAndUF. (#108378)

Update optimizeForVFAndUF to completely remove the vector loop region
when possible. At the moment, we cannot remove the region if it contains

* widened IVs: the recipe is needed to generate the step vector
* reductions: ComputeReductionResults requires the reduction phi recipe
for codegen.

Both cases can be addressed by more explicit modeling.

The patch also includes a number of updates to allow executing VPlans
without a vector loop region.

Depends on https://github.com/llvm/llvm-project/pull/110004



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