[llvm] [RISCV][ISel] Combine vector fadd/fsub/fmul with fp extend. (PR #81248)

[via llvm-commits]

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@@ -13273,22 +13281,34 @@ struct NodeExtensionHelper {
     return OrigOperand.getOpcode() == RISCVISD::VMV_V_X_VL;
   }
 
+  /// Get the extended opcode.
+  unsigned getExtOpc(ExtKind SupportsExt) const {
+    switch (SupportsExt) {
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sun-jacobi wrote:

It might be more readable with a enum? We could know exactly what extensions are currently supported.

https://github.com/llvm/llvm-project/pull/81248