================
@@ -3845,6 +3845,70 @@ Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, 
unsigned BuiltinID,
     if (BuiltinCountedByRef(TheCall))
       return ExprError();
     break;
+
+  case Builtin::BI__builtin_ct_select: {
+    if (TheCall->getNumArgs() != 3) {
+      // Simple argument count check without complex diagnostics
+      if (TheCall->getNumArgs() < 3) {
+        return Diag(TheCall->getEndLoc(),
+                    diag::err_typecheck_call_too_few_args_at_least)
+               << 0 << 3 << TheCall->getNumArgs() << 0
+               << TheCall->getCallee()->getSourceRange();
+      } else {
+        return Diag(TheCall->getEndLoc(),
----------------
arsenm wrote:

Missing error test

https://github.com/llvm/llvm-project/pull/166703
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