[all-commits] [llvm/llvm-project] a1bdb0: [VectorCombine] Change shuffleToIdentity to use Us...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a1bdb016564d3c0867e83f3bb7494bfe8128f4b6
      https://github.com/llvm/llvm-project/commit/a1bdb016564d3c0867e83f3bb7494bfe8128f4b6
  Author: David Green <david.green at arm.com>
  Date:   2024-06-17 (Mon, 17 Jun 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/VectorCombine/AArch64/shuffletoidentity.ll

  Log Message:
  -----------
  [VectorCombine] Change shuffleToIdentity to use Use. NFC

When looking up through shuffles, a Value can be multiple different leaf types
(for example an identity from one position, a splat from another). We currently
detect this by recalculating which type of leaf it is when generating, but as
more types of leafs are added (#94954) this doesn't scale very well.

This patch switches it to use Use, not Value, to more accurately detect which
type of leaf each Use should have.



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