[all-commits] [llvm/llvm-project] 24a809: [MLIR] Avoid `vector.extract_strided_slice` when n...

[lialan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 24a8092be7c1700e9bcdb15c114e9a738f0a2a6b
      https://github.com/llvm/llvm-project/commit/24a8092be7c1700e9bcdb15c114e9a738f0a2a6b
  Author: lialan <me at alanli.org>
  Date:   2024-11-12 (Tue, 12 Nov 2024)

  Changed paths:
    M mlir/lib/Dialect/Vector/Transforms/VectorEmulateNarrowType.cpp

  Log Message:
  -----------
  [MLIR] Avoid `vector.extract_strided_slice` when not needed (#115941)

In `staticallyExtractSubvector`, When the extracting slice is the same
as source vector, do not need to emit `vector.extract_strided_slice`.

This fixes the lit test case `@vector_store_i4` in
`mlir\test\Dialect\Vector\vector-emulate-narrow-type.mlir`, where
converting from `vector<8xi4>` to `vector<4xi8>` does not need slice
extraction.

The issue was introduced in #113411 and #115070, CI failure link:
https://buildkite.com/llvm-project/github-pull-requests/builds/118845

This PR does not include a lit test case because it is a fix and the
above mentioned `@vector_store_i4` test actually tests the mechanism.

Signed-off-by: Alan Li <me at alanli.org>



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