[all-commits] [llvm/llvm-project] 055db3: [LV] Optimise latch exit induction users for some ...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 055db3ec334221408f5187ce507c45925ceeb143
      https://github.com/llvm/llvm-project/commit/055db3ec334221408f5187ce507c45925ceeb143
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-03-11 (Tue, 11 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/single_early_exit_live_outs.ll

  Log Message:
  -----------
  [LV] Optimise latch exit induction users for some early exit loops (#128880)

This is the first of two PRs that attempts to improve the IR
generated in the exit blocks of vectorised loops with uncountable
early exits. In this PR I am improving the generated code for
users of induction variables in early exit loops that have a
unique exit block, when exiting via the latch.

I have moved some of the code for calculating the exit values in
latch exit blocks from `optimizeInductionExitUsers` into a new
function `optimizeLatchExitInductionUser`.

I intend to follow this up very soon with another patch to
optimise the code for induction users in the vector.early.exit
block.



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