diff options
Diffstat (limited to 'cpu/o3/mem_dep_unit_impl.hh')
| -rw-r--r-- | cpu/o3/mem_dep_unit_impl.hh | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/cpu/o3/mem_dep_unit_impl.hh b/cpu/o3/mem_dep_unit_impl.hh index 8b195baab..595e9293f 100644 --- a/cpu/o3/mem_dep_unit_impl.hh +++ b/cpu/o3/mem_dep_unit_impl.hh @@ -105,6 +105,7 @@ template <class MemDepPred, class Impl> void MemDepUnit<MemDepPred, Impl>::switchOut() { + // Clear any state. for (int i = 0; i < Impl::MaxThreads; ++i) { instList[i].clear(); } @@ -116,6 +117,7 @@ template <class MemDepPred, class Impl> void MemDepUnit<MemDepPred, Impl>::takeOverFrom() { + // Be sure to reset all state. loadBarrier = storeBarrier = false; loadBarrierSN = storeBarrierSN = 0; depPred.clear(); @@ -146,7 +148,7 @@ MemDepUnit<MemDepPred, Impl>::insert(DynInstPtr &inst) inst_entry->listIt = --(instList[tid].end()); // Check any barriers and the dependence predictor for any - // producing stores. + // producing memrefs/stores. InstSeqNum producing_store; if (inst->isLoad() && loadBarrier) { producing_store = loadBarrierSN; @@ -253,6 +255,7 @@ void MemDepUnit<MemDepPred, Impl>::insertBarrier(DynInstPtr &barr_inst) { InstSeqNum barr_sn = barr_inst->seqNum; + // Memory barriers block loads and stores, write barriers only stores. if (barr_inst->isMemBarrier()) { loadBarrier = true; loadBarrierSN = barr_sn; @@ -330,6 +333,7 @@ MemDepUnit<MemDepPred, Impl>::replay(DynInstPtr &inst) DynInstPtr temp_inst; bool found_inst = false; + // For now this replay function replays all waiting memory ops. while (!instsToReplay.empty()) { temp_inst = instsToReplay.front(); |