[all-commits] [llvm/llvm-project] c2d15a: [VPlan] Update final IV exit value via VPlan. (#11...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c2d15ac4d4432788557e77c15ce572ac655a8fec
      https://github.com/llvm/llvm-project/commit/c2d15ac4d4432788557e77c15ce572ac655a8fec
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-01-18 (Sat, 18 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/lib/Transforms/Vectorize/VPlanUtils.h
    M llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll
    M llvm/test/Transforms/LoopVectorize/X86/multi-exit-cost.ll
    M llvm/test/Transforms/LoopVectorize/iv_outside_user.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit_live_outs.ll
    M llvm/test/Transforms/LoopVectorize/unused-blend-mask-for-first-operand.ll

  Log Message:
  -----------
  [VPlan] Update final IV exit value via VPlan. (#112147)

Model updating IV users directly in VPlan, replace fixupIVUsers.

Now simple extracts are created for all phis in the exit block during
initial VPlan construction. A later VPlan transform 
(optimizeInductionExitUsers) replaces extracts of inductions with 
their pre-computed values if possible.

This completes the transition towards modeling all live-outs directly in
VPlan.

There are a few follow-ups:
* emit extracts initially also for resume phis, and optimize them 
   tougher with IV exit users
* support for VPlans with multiple exits in optimizeInductionExitUsers.


Depends on https://github.com/llvm/llvm-project/pull/110004,
https://github.com/llvm/llvm-project/pull/109975 and
https://github.com/llvm/llvm-project/pull/112145.



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