[llvm] [mlir] [mlir][EmitC] Add MathToEmitC pass for math function lowering to EmitC (PR #113799)

[Simon Camphausen via llvm-commits]

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@@ -62,4 +62,13 @@ def EmitC_OpaqueAttr : EmitC_Attr<"Opaque", "opaque"> {
 
 def EmitC_OpaqueOrTypedAttr : AnyAttrOf<[EmitC_OpaqueAttr, TypedAttrInterface]>;
 
+def MathToEmitCLanguageTarget : I32EnumAttr<"MathToEmitCLanguageTarget",
+  "Specifies the language target for generating callees.", [
+    I32EnumAttrCase<"C", 0, "Use C-style function names">,
+    I32EnumAttrCase<"CPP", 1, "Use C++-style function names">
+  ]> {
+  let cppNamespace = "::mlir::emitc";
+}
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simon-camp wrote:

Does this have to be an attribute right now? As we don't have a dedicated op we could attach this to yet, we could start with a `LanguageTarget` enum somewhere in `Dialect/EmitC/Transforms`. Once we introduce a module like op we can give it an inherent attribute to define the target.

Additionally I would strip the `Math` prefix from the name as I expect this to be used in more places in the future as @aniragil mentioned.

https://github.com/llvm/llvm-project/pull/113799