another bug fix

diff --git a/model.cc b/model.cc
index 62e75205e4ee9681bcef321856c744978c9cc5c1..468900aeb6120f659124e09fc839ac8aa53416ee 100644 (file)
--- a/model.cc
+++ b/model.cc
@@ -951,10 +951,10 @@ void ModelChecker::post_r_modification_order(ModelAction *curr, const ModelActio
                action_list_t::reverse_iterator rit;
                ModelAction *lastact = NULL;
 
-               /* Find last action that happens after curr */
+               /* Find last action that happens after curr that is either not curr or a rmw */
                for (rit = list->rbegin(); rit != list->rend(); rit++) {
                        ModelAction *act = *rit;
-                       if (curr->happens_before(act)) {
+                       if (curr->happens_before(act) && (curr != act || curr->is_rmw())) {
                                lastact = act;
                        } else
                                break;
@@ -962,12 +962,25 @@ void ModelChecker::post_r_modification_order(ModelAction *curr, const ModelActio
 
                        /* Include at most one act per-thread that "happens before" curr */
                if (lastact != NULL) {
-                       if (lastact->is_read()) {
+                       if (lastact==curr) {
+                               //Case 1: The resolved read is a RMW, and we need to make sure
+                               //that the write portion of the RMW mod order after rf
+
+                               mo_graph->addEdge(rf, lastact);
+                       } else if (lastact->is_read()) {
+                               //Case 2: The resolved read is a normal read and the next
+                               //operation is a read, and we need to make sure the value read
+                               //is mod ordered after rf
+
                                const ModelAction *postreadfrom = lastact->get_reads_from();
                                if (postreadfrom != NULL&&rf != postreadfrom)
                                        mo_graph->addEdge(rf, postreadfrom);
-                       } else if (rf != lastact) {
-                               mo_graph->addEdge(rf, lastact);
+                       } else {
+                               //Case 3: The resolved read is a normal read and the next
+                               //operation is a write, and we need to make sure that the
+                               //write is mod ordered after rf
+                               if (lastact!=rf)
+                                       mo_graph->addEdge(rf, lastact);
                        }
                        break;
                }