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Summary

  1. [mlir][Linalg] Update the semantics, verifier and test for Linalg with (details)
Commit f52d71736b10e87b1aa1880b777dc9462a0085ce by ntv
[mlir][Linalg] Update the semantics, verifier and test for Linalg with
tensors.
Summary: This diff fixes issues with the semantics of linalg.generic on
tensors that appeared when converting directly from HLO to
linalg.generic. The changes are self-contained within MLIR and can be
captured and tested independently of XLA.
The linalg.generic and indexed_generic are updated to:
To allow progressive lowering from the value world (a.k.a tensor values)
to the buffer world (a.k.a memref values), a linalg.generic op accepts
mixing input and output ranked tensor values with input and output
memrefs.
```
%1 = linalg.generic #trait_attribute %A, %B {other-attributes} :
tensor<?x?xf32>,
memref<?x?xf32, stride_specification>
-> (tensor<?x?xf32>)
```
In this case, the number of outputs (args_out) must match the sum of (1)
the number of output buffer operands and (2) the number of tensor return
values. The semantics is that the linalg.indexed_generic op produces
(i.e. allocates and fills) its return values.
Tensor values must be legalized by a buffer allocation pass before most
transformations can be applied. Such legalization moves tensor return
values into output buffer operands and updates the region argument
accordingly.
Transformations that create control-flow around linalg.indexed_generic
operations are not expected to mix with tensors because SSA values do
not escape naturally. Still, transformations and rewrites that take
advantage of tensor SSA values are expected to be useful and will be
added in the near future.
Subscribers: bmahjour, mehdi_amini, rriddle, jpienaar, burmako,
shauheen, antiagainst, arpith-jacob, mgester, lucyrfox, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D72555
The file was modifiedmlir/lib/Dialect/Linalg/Transforms/Promotion.cpp
The file was modifiedmlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
The file was modifiedmlir/lib/Dialect/Linalg/Transforms/LinalgToLoops.cpp
The file was modifiedmlir/include/mlir/Dialect/Linalg/Utils/Utils.h
The file was modifiedmlir/include/mlir/Dialect/Linalg/IR/LinalgTraits.h
The file was modifiedmlir/lib/Dialect/Linalg/Transforms/Tiling.cpp
The file was modifiedmlir/lib/Dialect/Linalg/Transforms/Fusion.cpp
The file was modifiedmlir/test/Dialect/Linalg/roundtrip.mlir
The file was modifiedmlir/lib/Dialect/Linalg/Transforms/LinalgTransforms.cpp
The file was modifiedmlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td
The file was modifiedmlir/test/Dialect/Linalg/invalid.mlir
The file was modifiedmlir/lib/Dialect/Linalg/Analysis/DependenceAnalysis.cpp