diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -11318,11 +11318,8 @@
   "matrix row and column subscripts cannot be separated by any expression">;
 def err_matrix_subscript_comma: Error<
   "comma expressions are not allowed as indices in matrix subscript expressions">;
-def err_builtin_matrix_arg: Error<"1st argument must be a matrix">;
 def err_builtin_matrix_scalar_unsigned_arg: Error<
   "%0 argument must be a constant unsigned integer expression">;
-def err_builtin_matrix_pointer_arg: Error<
-  "%ordinal0 argument must be a pointer to a valid matrix element type">;
 def err_builtin_matrix_pointer_arg_mismatch: Error<
   "the pointee of the 2nd argument must match the element type of the 1st argument (%0 != %1)">;
 def err_builtin_matrix_store_to_const: Error<
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -16578,7 +16578,8 @@
 
   auto *MType = Matrix->getType()->getAs<ConstantMatrixType>();
   if (!MType) {
-    Diag(Matrix->getBeginLoc(), diag::err_builtin_matrix_arg);
+    Diag(Matrix->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+        << 1 << "matrix" << Matrix->getType();
     return ExprError();
   }
 
@@ -16649,15 +16650,17 @@
   auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
   QualType ElementTy;
   if (!PtrTy) {
-    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
-        << PtrArgIdx + 1;
+    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+        << PtrArgIdx + 1 << "pointer to a valid matrix element type"
+        << PtrExpr->getType();
     ArgError = true;
   } else {
     ElementTy = PtrTy->getPointeeType().getUnqualifiedType();
 
     if (!ConstantMatrixType::isValidElementType(ElementTy)) {
-      Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
-          << PtrArgIdx + 1;
+      Diag(PtrExpr->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+          << PtrArgIdx + 1 << "pointer to a valid matrix element type"
+          << PtrExpr->getType();
       ArgError = true;
     }
   }
@@ -16756,7 +16759,8 @@
 
   auto *MatrixTy = MatrixExpr->getType()->getAs<ConstantMatrixType>();
   if (!MatrixTy) {
-    Diag(MatrixExpr->getBeginLoc(), diag::err_builtin_matrix_arg) << 0;
+    Diag(MatrixExpr->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+        << 1 << "matrix" << MatrixExpr->getType();
     ArgError = true;
   }
 
@@ -16775,8 +16779,9 @@
   // Check pointer argument.
   auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
   if (!PtrTy) {
-    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
-        << PtrArgIdx + 1;
+    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+        << PtrArgIdx + 1 << "pointer to a valid matrix element type"
+        << PtrExpr->getType();
     ArgError = true;
   } else {
     QualType ElementTy = PtrTy->getPointeeType();