Merge branch 'master' of https://github.com/vortexgpgpu/vortex

sim/simX/decode.cpp

@@ -182,6 +182,7 @@ static const char* op_string(const Instr &instr) {
     case 2: return "SPLIT";
     case 3: return "JOIN";
     case 4: return "BAR"; 
+    case 6: return "PREFETCH";
     default:
       std::abort();
     }

sim/simX/execute.cpp

@@ -712,6 +712,11 @@ void Warp::execute(const Instr &instr, Pipeline *pipeline) {
         pipeline->stall_warp = true; 
         runOnce = true;       
       } break;
+      case 6: {
+        // PREFETCH
+        int addr = rsdata[0];
+        printf("*** PREFETCHED %d ***\n", addr);
+      } break;
       default:
         std::abort();
       }