================
@@ -16,88 +16,90 @@ namespace clang {
 
 SemaSPIRV::SemaSPIRV(Sema &S) : SemaBase(S) {}
 
+/// Checks if the first `NumArgsToCheck` arguments of a function call are of
+/// vector type. If any of the arguments is not a vector type, it emits a
+/// diagnostic error and returns `true`. Otherwise, it returns `false`.
+///
+/// \param TheCall The function call expression to check.
+/// \param NumArgsToCheck The number of arguments to check for vector type.
+/// \return `true` if any of the arguments is not a vector type, `false`
+/// otherwise.
+
+bool SemaSPIRV::CheckVectorArgs(CallExpr *TheCall, unsigned NumArgsToCheck) {
+  for (unsigned i = 0; i < NumArgsToCheck; ++i) {
+    ExprResult Arg = TheCall->getArg(i);
+    QualType ArgTy = Arg.get()->getType();
+    auto *VTy = ArgTy->getAs<VectorType>();
+    if (VTy == nullptr) {
+      SemaRef.Diag(Arg.get()->getBeginLoc(),
+                   diag::err_typecheck_convert_incompatible)
+          << ArgTy
+          << SemaRef.Context.getVectorType(ArgTy, 2, VectorKind::Generic) << 1
+          << 0 << 0;
+      return true;
+    }
+  }
+  return false;
+}
+
 bool SemaSPIRV::CheckSPIRVBuiltinFunctionCall(unsigned BuiltinID,
                                               CallExpr *TheCall) {
   switch (BuiltinID) {
   case SPIRV::BI__builtin_spirv_distance: {
----------------
spall wrote:

does this not need to check that the element type is a float? Is that checked 
previously? 

https://github.com/llvm/llvm-project/pull/136026
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