[Mlir-commits] [mlir] [TOSA] Add pass to sanitize gather/scatter indices (PR #221200)

[Luke Hutton]

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@@ -199,6 +199,24 @@ def TosaDowngrade1p1To1p0Pass
   }];
 }
 
+def TosaGatherScatterHardeningPass
+    : Pass<"tosa-gather-scatter-hardening", "func::FuncOp"> {
+  let summary = "Clamp TOSA gather and scatter indices to valid bounds";
+  let description = [{
+    Bounds the indices used by each gather and scatter with TOSA minimum and
+    maximum operations so that all accesses are in bounds. When the same
+    indices value is used by several gather or scatter operations that require
+    identical bounds, one bounding sequence is shared by all of them. Other
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lhutton1 wrote:

I suspect this is something that can be tidied up with common sub expression elimination. To keep the pass simple, we can avoid doing this here

https://github.com/llvm/llvm-project/pull/221200