[Mlir-commits] [mlir] [mlir][ArmSME] Lower extract from 2D scalable create_mask to psel (PR #96066)

[Cullen Rhodes]

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@@ -549,6 +550,77 @@ struct VectorExtractToArmSMELowering
   }
 };
 
+/// Lower a `vector.extract` from a 2-D scalable `vector.create_mask` to
+/// `arm_sve.psel`. Note: While psel is under ArmSVE it requires SME (or
+/// SVE 2.1), so this is currently the most logical place for this lowering.
+///
+/// Example:
+/// ```mlir
+/// %mask = vector.create_mask %a, %b : vector<[4]x[8]xi1>
+/// %slice = vector.extract %mask[%index]
+///                                   : vector<[8]xi1> from vector<[4]x[8]xi1>
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c-rhodes wrote:

nit: indentation is too much, 2 spaces would be enough (same below)

https://github.com/llvm/llvm-project/pull/96066