createResidualExp: added heuristic for a-b=0 or b-a=0

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@23492 f25d12d1-65f4-0310-ae8a-bbce733d8d8e
OpenModelica · Nov 20, 2014 · 4ebd209 · 4ebd209
1 parent 20ffbea
commit 4ebd209
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Compiler/FrontEnd/Expression.mo b/Compiler/FrontEnd/Expression.mo
@@ -11279,7 +11279,7 @@ algorithm
         //explst = listAppend(explst, explst1);
         res2 = makeSimplifySum(explst1);
         res2 = expMul(res2,e1);
-        res = expSub(res1, res2);
+        res = if isConst(res1) or (listLength(explst1) + 1) > listLength(explst) then expSub(res2, res1) else expSub(res1, res2); //heuristic
         (res, _) = ExpressionSimplify.simplify(res);
       then
         res;