avoid unnecessary table copies

Author: pdschubert

include/phasar/PhasarLLVM/DataFlowSolver/IfdsIde/Solver/IDESolver.h

@@ -892,8 +892,8 @@ class IDESolver
     for (n_t n : Values) {
       for (n_t SP : ICF->getStartPointsOf(ICF->getFunctionOf(n))) {
         using TableCell = typename Table<d_t, d_t, EdgeFunctionPtrType>::Cell;
-        Table<d_t, d_t, EdgeFunctionPtrType> LookupByTarget;
-        LookupByTarget = JumpFn->lookupByTarget(n);
+        Table<d_t, d_t, EdgeFunctionPtrType> &LookupByTarget =
+            JumpFn->lookupByTarget(n);
         for (const TableCell &SourceValTargetValAndFunction :
              LookupByTarget.cellSet()) {
           d_t dPrime = SourceValTargetValAndFunction.getRowKey();

include/phasar/PhasarLLVM/DataFlowSolver/IfdsIde/Solver/JumpFunctions.h

@@ -169,7 +169,7 @@ template <typename AnalysisDomainTy, typename Container> class JumpFunctions {
    * The return value is a set of records of the form
    * (sourceVal,targetVal,edgeFunction).
    */
-  Table<d_t, d_t, EdgeFunctionPtrType> lookupByTarget(n_t Target) {
+  Table<d_t, d_t, EdgeFunctionPtrType> &lookupByTarget(n_t Target) {
     return NonEmptyLookupByTargetNode[Target];
   }