[llvm-branch-commits] [mlir] [mlir-c] Add 1:N TypeConverter conversion and materialization bindings (PR #208935)

[Jacques Pienaar via llvm-branch-commits]

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@@ -833,7 +833,194 @@ static MlirValue buildCastMaterialization(MlirRewriterBase rewriter,
   return mlirOperationGetResult(castOp, 0);
 }
 
-// Conversion pattern for `test.source`: replaces it with a `test.source_i64`
+// Source materialization callback that always declines (returns a null value)
+// and records that it was consulted. Used to exercise the "this materialization
+// declined, try the next one" fallback path.
+static MlirValue
+declineSourceMaterialization(MlirRewriterBase rewriter, MlirType outputType,
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jpienaar wrote:

Up to you, but I think you can also just do

`MlirRewriterBase /*rewriter*/`

to avoid needing void below and make it more self-documenting in signature that not used.

https://github.com/llvm/llvm-project/pull/208935