[Mlir-commits] [mlir] [mlir][vector] Add `actualRank` output parameter to `createUnrollIterator()` (PR #94197)

[Benjamin Maxwell]

================
@@ -86,20 +86,24 @@ bool isContiguousSlice(MemRefType memrefType, VectorType vectorType);
 ///
 /// If no leading dimensions can be unrolled an empty optional will be returned.
 ///
+/// The actual rank the vector type can be unrolled to can be discovered by
+/// passing a pointer (to an int64_t) to the optional `actualRank` parameter.
+///
----------------
MacDue wrote:

I think this is already covered by the existing docs:
```
/// Returns an iterator for all positions in the leading dimensions of `vType`
/// up to the `targetRank`. If any leading dimension before the `targetRank` is
/// scalable (so cannot be unrolled), it will return an iterator for positions
/// up to the first scalable dimension.
```

https://github.com/llvm/llvm-project/pull/94197