[PATCH] D133166: [mlir][MemRef] Canonicalize extract_strided_metadata(subview)

[Quentin Colombet via Phabricator via llvm-commits]

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Add a canonicalization step for extract_strided_metadata(subview).
The goal is to get rid of the subview while expressing its effects directly on the offset and strides of the base object.

In other words, this canonicalization replaces:

  baseBuffer, offset, sizes, strides =
      extract_strided_metadata(
          subview(memref, subOffset, subSizes, subStrides))

With

  baseBuffer, baseOffset, baseSizes, baseStrides =
      extract_strided_metadata(memref)
  strides#i = baseStrides#i * subSizes#i
  offset = baseOffset + sum(subOffset#i * strides#i)
  sizes = subSizes


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133166

Files:
  mlir/include/mlir/Dialect/MemRef/IR/MemRefOps.td
  mlir/lib/Dialect/MemRef/IR/MemRefOps.cpp
  mlir/test/Dialect/MemRef/canonicalize.mlir

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