[all-commits] [llvm/llvm-project] 1c9fe8: [LV] Optimise users of induction variables in earl...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c9fe8c8af7e473e37e141d36837d196dd9a5256
      https://github.com/llvm/llvm-project/commit/1c9fe8c8af7e473e37e141d36837d196dd9a5256
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-03-26 (Wed, 26 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/early_exit_costs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/simple_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit_live_outs.ll
    M llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-early-exit.ll

  Log Message:
  -----------
  [LV] Optimise users of induction variables in early exit blocks (#130766)

This is the second of two PRs that attempts to improve the IR
generated in the exit blocks of vectorised loops with uncountable
early exits. It follows on from PR #128880. In this PR I am
improving the generated code for users of induction variables in
early exit blocks.

This required using a newly add VPInstruction called
FirstActiveLane, which calculates the index of the first active
predicate in the mask operand.

I have added a new function optimizeEarlyExitInductionUser that
is called from optimizeInductionExitUsers when handling users in
early exit blocks.



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