[all-commits] [llvm/llvm-project] 0bf798: [mlir][ArmSME] Remove `ConvertIllegalShapeCastOpsT...

[Andrzej Warzyński via All-commits]

  Branch: refs/heads/users/banach-space/sme/remove_ConvertIllegalShapeCastOpsToTransposes
  Home:   https://github.com/llvm/llvm-project
  Commit: 0bf798d0b39216e584c452559f8c54bcc8583676
      https://github.com/llvm/llvm-project/commit/0bf798d0b39216e584c452559f8c54bcc8583676
  Author: Andrzej Warzynski <andrzej.warzynski at arm.com>
  Date:   2025-05-14 (Wed, 14 May 2025)

  Changed paths:
    M mlir/lib/Dialect/ArmSME/Transforms/VectorLegalization.cpp
    M mlir/lib/Dialect/Vector/IR/VectorOps.cpp
    M mlir/test/Dialect/ArmSME/vector-legalization.mlir
    M mlir/test/Dialect/Vector/canonicalize/vector-transpose.mlir

  Log Message:
  -----------
  [mlir][ArmSME] Remove `ConvertIllegalShapeCastOpsToTransposes`

As a follow-up to PR #135841 (see discussion for context), this patch
removes `ConvertIllegalShapeCastOpsToTransposes` from the SME legalization
pass and unblocks `ShapeCastOp::fold` for scalable vectors.

AFAIK, `ConvertIllegalShapeCastOpsToTransposes` was originally needed
because we were generating `vector.shape_cast` ops that couldn't be
lowered otherwise. To confirm it's no longer required, I tested this
patch locally using end-to-end tests.

Notably, this also removes a special case from `ShapeCastOp::fold`.



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