Hi everyone,
I have just landed two patches that update how scalable vectors work:
- ⚙ D153372 [mlir][VectorType] Allow arbitrary dimensions to be scalable
- ⚙ D153412 [mlir][VectorType] Remove `numScalableDims` from the vector type
If you don’t care about scalable vectors then this change won’t affect you 
If you do use scalable vectors then please note that this old syntax:
// OLD syntax
vector<[2x3]x4xf32>
has been replaced with:
// NEW syntax
vector<[2]x[3]x4xf32>
Additionally (and more importantly), any dimension in a vector is allowed to be scalable, e.g.:
// NEW - arbitrary dimension can be scalable. This wasn't supported _before_.
vector<[2]x4xf32>
Until recently only the trailing dimensions were allowed to be scalable, e.g.
// OLD - only the trailing dimension can be scalable
vector<2x[4]xf32>
This change was introduced to enable https://discourse.llvm.org/t/rfc-scalable-vectorisation-in-linalg/.
-Andrzej