[all-commits] [llvm/llvm-project] 5bfcf1: [VPlan] Construct VPlan1 once, share across buildV...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5bfcf13e48c9a168ff431fa655a41d88c725ca85
      https://github.com/llvm/llvm-project/commit/5bfcf13e48c9a168ff431fa655a41d88c725ca85
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-05-27 (Wed, 27 May 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/store-costs-sve.ll

  Log Message:
  -----------
  [VPlan] Construct VPlan1 once, share across buildVPlans calls. (#197276)

Extract the VF-independent VPlan1 setup pipeline (header phis,
simplification, early-exit handling, middle check, loop regions, tail
folding, mask introduction) into a new helper tryToBuildVPlan1().

Construct the initial Vlan1 once, and pass to repeated buildVPlans
calls.

Note that this means we need to move collectInLoopReductions up. We not
may construct VPlan1 on code paths where we did not before, because we
failed UserVF validation/selection, but I think that should be fine as
this makes the overall code simpler and the UserVF code paths are for
testing.

PR: https://github.com/llvm/llvm-project/pull/197276



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