[Mlir-commits] [mlir] [mlir][ArmSME] Update tile slice layout syntax (PR #69151)

[Benjamin Maxwell]

MacDue wrote:

> the ambiguity comes from having 2 optional groups with leading ,, the generator can't handle this.

As when it sees a `,` it does not know if what follows should be the padding or the layout. It's not clever enough to look ahead and see the next token must be a layout (or must be padding), so it requires you to use the explicit syntax (`#arm_sme.layout<horizontal>`).

https://github.com/llvm/llvm-project/pull/69151