`memref.extract_strided_metadata` can forward constants independently of the
exsistence of other operations such as subview or reshape.
Differential Revision: https://reviews.llvm.org/D134603
Add a pattern to the pass that simplifies
extract_strided_metadata(other_op(memref)).
The new pattern gets rid of the expand_shape operation while
materializing its effects on the sizes, and the strides of
the base object.
In other words, this simplification replaces:
```
baseBuffer, offset, sizes, strides =
extract_strided_metadata(expand_shape(memref))
```
With
```
baseBuffer, offset, baseSizes, baseStrides =
extract_strided_metadata(memref)
sizes#reassIdx =
baseSizes#reassDim / product(expandShapeSizes#j,
for j in group excluding
reassIdx)
strides#reassIdx =
baseStrides#reassDim * product(expandShapeSizes#j,
for j in
reassIdx+1..
reassIdx+group.size-1)
```
Where `reassIdx` is a reassociation index for the group at
`reassDim` and `expandShapeSizes#j` is either:
- The constant size at dimension j, derived directly from the
result type of the expand_shape op, or
- An affine expression: baseSizes#reassDim / product of all
constant sizes in expandShapeSizes.
Note: baseBuffer and offset are unaffected by the expand_shape
operation.
Differential Revision: https://reviews.llvm.org/D133625
Add a dedicated pass to simplify
extract_strided_metadata(other_op(memref)).
Currently the pass features only one pattern:
extract_strided_metadata(subview).
The goal is to get rid of the subview while materializing its effects on
the offset, sizes, and strides with respect to the base object.
In other words, this simplification 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
```
Differential Revision: https://reviews.llvm.org/D133166
