[all-commits] [llvm/llvm-project] 2c8713: Reapply "[VPlan] Update final IV exit value via VP...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2c87133c6212d4bd02b5e64adbb51f4e66bc2351
      https://github.com/llvm/llvm-project/commit/2c87133c6212d4bd02b5e64adbb51f4e66bc2351
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-01-19 (Sun, 19 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:
  -----------
  Reapply "[VPlan] Update final IV exit value via VPlan. (#112147)"

This reverts the revert commit 58326f1d5b5b379590af92dd129b2f3b3e96af46.

The build failure in sanitizer stage2 builds has been fixed with
0d39fe6f5bb3edf0bddec09a8c6417377390aeac.

Original commit message:
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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