[all-commits] [llvm/llvm-project] 6d88ac: [mlir][bufferization] Transfer `restrict` during e...

[Matthias Springer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d88ac11d7d7353beab83016a363d7542e0b020c
      https://github.com/llvm/llvm-project/commit/6d88ac11d7d7353beab83016a363d7542e0b020c
  Author: Matthias Springer <me at m-sp.org>
  Date:   2023-10-11 (Wed, 11 Oct 2023)

  Changed paths:
    M mlir/include/mlir/Dialect/Bufferization/IR/BufferizationOps.td
    M mlir/lib/Dialect/Bufferization/IR/BufferizationOps.cpp
    M mlir/test/Dialect/Bufferization/Transforms/one-shot-bufferize-empty-tensor-elimination.mlir
    M mlir/test/Dialect/Bufferization/invalid.mlir

  Log Message:
  -----------
  [mlir][bufferization] Transfer `restrict` during empty tensor elimination (#68729)

Empty tensor elimination is looking for
`bufferization.materialize_in_destination` ops with a `tensor.empty`
source. It replaces the `tensor.empty` with a `bufferization.to_tensor
restrict` of the memref destination. As part of this rewrite, the
`restrict` keyword should be removed, so that no second `to_tensor
restrict` op will be inserted. Such IR would be invalid.
`bufferization.materialize_in_destination` with memref destination and
without the `restrict` attribute are ignored by empty tensor
elimination.

Also relax the verifier of `materialize_in_destination`. The `restrict`
keyword is not generally needed because the op does not expose the
buffer as a tensor.