This PR adds "downcasting" of `ir.Value` to either `BlockArgument` or
`OpResult` (and then potentially further down if a user-registered
"value caster" exists). Also this PR changes `__str__` to return the
correct thing (`OpResult(...)` or `BlockArgument(...)` instead of
generic `Value(...)`).
The current implementation of the WMMA intrinsic ops as they are defined
in the ROCDL tablegen is incorrect. They represent as operands what
should be attributes such as `clamp`, `opsel`, `signA/signB`. This
change performs a refactoring to bring it in line with what we expect.
---------
Signed-off-by: Muzammiluddin Syed <muzasyed@amd.com>
Ops that are already snake case (like [`ROCDL_wmma_*`
ops](66b0b0466b/mlir/include/mlir/Dialect/LLVMIR/ROCDLOps.td (L411)))
produce python "value-builders" that collide with the class names:
```python
class wmma_bf16_16x16x16_bf16(_ods_ir.OpView):
OPERATION_NAME = "rocdl.wmma.bf16.16x16x16.bf16"
...
def wmma_bf16_16x16x16_bf16(res, args, *, loc=None, ip=None) -> _ods_ir.Value:
return wmma_bf16_16x16x16_bf16(res=res, args=args, loc=loc, ip=ip).result
```
and thus cannot be emitted (because of recursive self-calls).
This PR fixes that by affixing `_` to the value builder names.
I would've preferred to just rename the ops but that would be a breaking
change 🤷.
