[all-commits] [llvm/llvm-project] e2b365: [mlir][Linalg] Break unnecessary dependency throug...

[MaheshRavishankar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e2b365948b363636624d5c8cf631f075b19351aa
      https://github.com/llvm/llvm-project/commit/e2b365948b363636624d5c8cf631f075b19351aa
  Author: MaheshRavishankar <ravishankarm at google.com>
  Date:   2021-05-18 (Tue, 18 May 2021)

  Changed paths:
    M mlir/lib/Dialect/Linalg/Transforms/FusionOnTensors.cpp
    M mlir/test/Dialect/Linalg/fusion-tensor.mlir
    M mlir/test/Dialect/Linalg/reshape_fusion.mlir

  Log Message:
  -----------
  [mlir][Linalg] Break unnecessary dependency through unused `outs` tensor.

LinalgOps that are all parallel do not use the value of `outs`
tensor. The semantics is that the `outs` tensor is fully
overwritten. Using anything other than `init_tensor` can add false
dependencies between operations, when the use is just for the shape of
the tensor. Adding a canonicalization to always use `init_tensor` in
such cases, breaks this dependence.

Differential Revision: https://reviews.llvm.org/D102561