In this patch we are adding the support of copying a a `memref.subview` to the shared or private memory in GPU. The global to shared memory copy is adopted from codes implemented in IREE (https://github.com/iree-org/iree), but the private memory copy part has not been implemented in IREE. This patch enables transferring a subview from `global->shared`, `global->private`, and `shared->private`.
Our final aim is to provide a copy layout as an affine map to the `transform.promote` op to support transpose memory copy. This map is a permutation of the original affine index map. Although this has been implemented and user can copy data to arbitrary layout , this attempt is not included in this patch since we have still problem with `linalg.generic` operations to change their index map to the transformed index map. You can find more in following links ([[ 4fd5f93355 | Initial attempt to support layout map in promote op in transform dialect ]]) ([[ 9062b5849f | Fix data transpose in shared memory ]])
Reviewed By: ftynse
Differential Revision: https://reviews.llvm.org/D144666
115711c19c