[all-commits] [llvm/llvm-project] 72532c: [LV] Don't predicate divs with invariant divisor w...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 72532c921989990180b11d46e38a92874008f51a
      https://github.com/llvm/llvm-project/commit/72532c921989990180b11d46e38a92874008f51a
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-25 (Thu, 25 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/divs-with-scalable-vfs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/reduction-recurrence-costs-sve.ll
    M llvm/test/Transforms/LoopVectorize/X86/divs-with-tail-folding.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll

  Log Message:
  -----------
  [LV] Don't predicate divs with invariant divisor when folding tail (#98904)

When folding the tail, at least one of the lanes must execute
unconditionally. If the divisor is loop-invariant no predication is
needed, as predication would not prevent the divide-by-0 on the executed
lane.

Depends on https://github.com/llvm/llvm-project/pull/98892.

PR: https://github.com/llvm/llvm-project/pull/98904



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