- checking const tsubs for derivations

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@19104 f25d12d1-65f4-0310-ae8a-bbce733d8d8e
OpenModelica · Feb 13, 2014 · a4c0882 · a4c0882
1 parent f4bcb63
commit a4c0882
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/Compiler/BackEnd/Differentiate.mo b/Compiler/BackEnd/Differentiate.mo
@@ -790,8 +790,9 @@ algorithm
         failure(BackendDAE.DIFFERENTATION_TIME() = inDiffType);
 
         (res1, functionTree) = differentiateExp(e, inDiffwrtCref, inInputData, inDiffType, inFunctionTree);
-
-        res = DAE.TSUB(res1, i, tp); 
+
+        b = Expression.isConstValue(res1);
+        res = Util.if_(b,DAE.TSUB(res1, i, tp),res1); 
         (res,_) = ExpressionSimplify.simplify(res);
 
         //se1 = ExpressionDump.printExpStr(res);