1 files changed, 33 insertions, 10 deletions

diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index ca4627bbf..6f69b5ac4 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -446,6 +446,17 @@ AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
 
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
+
+template
+Fault
+AtomicSimpleCPU::write(Twin32_t data, Addr addr,
+                       unsigned flags, uint64_t *res);
+
+template
+Fault
+AtomicSimpleCPU::write(Twin64_t data, Addr addr,
+                       unsigned flags, uint64_t *res);
+
 template
 Fault
 AtomicSimpleCPU::write(uint64_t data, Addr addr,
@@ -505,17 +516,28 @@ AtomicSimpleCPU::tick()
         Fault fault = setupFetchRequest(ifetch_req);
 
         if (fault == NoFault) {
-            ifetch_pkt->reinitFromRequest();
+            Tick icache_latency = 0;
+            bool icache_access = false;
+            dcache_access = false; // assume no dcache access
 
-            Tick icache_latency = icachePort.sendAtomic(ifetch_pkt);
-            // ifetch_req is initialized to read the instruction directly
-            // into the CPU object's inst field.
+            //Fetch more instruction memory if necessary
+            if(predecoder.needMoreBytes())
+            {
+                icache_access = true;
+                ifetch_pkt->reinitFromRequest();
+
+                icache_latency = icachePort.sendAtomic(ifetch_pkt);
+                // ifetch_req is initialized to read the instruction directly
+                // into the CPU object's inst field.
+            }
 
-            dcache_access = false; // assume no dcache access
             preExecute();
 
-            fault = curStaticInst->execute(this, traceData);
-            postExecute();
+            if(curStaticInst)
+            {
+                fault = curStaticInst->execute(this, traceData);
+                postExecute();
+            }
 
             // @todo remove me after debugging with legion done
             if (curStaticInst && (!curStaticInst->isMicroOp() ||
@@ -523,7 +545,8 @@ AtomicSimpleCPU::tick()
                 instCnt++;
 
             if (simulate_stalls) {
-                Tick icache_stall = icache_latency - cycles(1);
+                Tick icache_stall =
+                    icache_access ? icache_latency - cycles(1) : 0;
                 Tick dcache_stall =
                     dcache_access ? dcache_latency - cycles(1) : 0;
                 Tick stall_cycles = (icache_stall + dcache_stall) / cycles(1);
@@ -534,8 +557,8 @@ AtomicSimpleCPU::tick()
             }
 
         }
-
-        advancePC(fault);
+        if(predecoder.needMoreBytes())
+            advancePC(fault);
     }
 
     if (_status != Idle)