[all-commits] [llvm/llvm-project] bf2b14: [LV] Enable auto-vectorisation of loops with uncou...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bf2b14acf326bc9eecdf38722d4de8fddf126be6
      https://github.com/llvm/llvm-project/commit/bf2b14acf326bc9eecdf38722d4de8fddf126be6
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-06-27 (Fri, 27 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.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/AArch64/single-early-exit-interleave.ll
    M llvm/test/Transforms/LoopVectorize/early_exit_legality.ll
    M llvm/test/Transforms/LoopVectorize/early_exit_store_legality.ll
    M llvm/test/Transforms/LoopVectorize/multi_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/multi_early_exit_live_outs.ll
    M llvm/test/Transforms/LoopVectorize/single-early-exit-interleave.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit_live_outs.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit_with_outer_loop.ll
    M llvm/test/Transforms/LoopVectorize/uncountable-early-exit-vplan.ll
    M llvm/test/Transforms/LoopVectorize/unsupported_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-early-exit.ll

  Log Message:
  -----------
  [LV] Enable auto-vectorisation of loops with uncountable exits (#133099)

Until now the feature to enable vectorisation of some early exit
loops with uncountable exits was controlled under a flag, off by
default. Now that we have efficient code generation for
vectorising such loops (see PR #130766) and we still have some
time from the next LLVM release it seems like a good time point
to enable the feature by default. If any issues arise post-commit
it can be easily reverted.

Using this patch I built and ran the LLVM test suite successfully,
which on neoverse-v1 led to the vectorisation of 114 additional
early exit loops. I also built and ran SPEC2017 successfully for
both neoverse-v1 and neoverse-v2.



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