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Introduces a dataflow analysis for tracking offset, size, and stride
ranges of operations.
Inference of the metadata is accomplished through the implementation of
the interface
`InferStridedMetadataOpInterface`.
To keep the size of the patch small, this patch only implements the
interface for the
`memref.subview` operation. It's future work to add more operations.
Example:
```mlir
func.func @memref_subview(%arg0: memref<8x16x4xf32, strided<[64, 4, 1]>>) {
%c0 = arith.constant 0 : index
%c1 = arith.constant 1 : index
%c2 = arith.constant 2 : index
%0 = test.with_bounds {smax = 13 : index, smin = 11 : index, umax = 13 : index, umin = 11 : index} : index
%1 = test.with_bounds {smax = 7 : index, smin = 5 : index, umax = 7 : index, umin = 5 : index} : index
%subview = memref.subview %arg0[%c0, %c0, %c1] [%1, %0, %c2] [%c1, %c1, %c1] : memref<8x16x4xf32, strided<[64, 4, 1]>> to memref<?x?x?xf32, strided<[?, ?, ?], offset: ?>>
return
}
```
Applying `mlir-opt --test-strided-metadata-range-analysis` prints:
```
Op: %subview = memref.subview %arg0[%c0, %c0, %c1] [%1, %0, %c2] [%c1, %c1, %c1] : memref<8x16x4xf32, strided<[64, 4, 1]>> to memref<?x?x?xf32, strided<[?, ?, ?], offset: ?>>
result[0]: strided_metadata<offset = [{unsigned : [1, 1] signed : [1, 1]}], sizes = [{unsigned : [5, 7] signed : [5, 7]}, {unsigned : [11, 13] signed : [11, 13]}, {unsigned : [2, 2] signed : [2, 2]}], strides = [{unsigned : [64, 64] signed : [64, 64]}, {unsigned : [4, 4] signed : [4, 4]}, {unsigned : [1, 1] signed : [1, 1]}]>
```
---------
Signed-off-by: Fabian Mora <fabian.mora-cordero@amd.com>
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