[llvm] r189990 - mi-sched: Load clustering is a bit to expensive to enable unconditionally.

[Andrew Trick]

Author: atrick
Date: Wed Sep  4 16:00:08 2013
New Revision: 189990

URL: http://llvm.org/viewvc/llvm-project?rev=189990&view=rev
Log:
mi-sched: Load clustering is a bit to expensive to enable unconditionally.

Modified:
    llvm/trunk/include/llvm/Target/TargetInstrInfo.h
    llvm/trunk/lib/CodeGen/MachineScheduler.cpp

Modified: llvm/trunk/include/llvm/Target/TargetInstrInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetInstrInfo.h?rev=189990&r1=189989&r2=189990&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetInstrInfo.h (original)
+++ llvm/trunk/include/llvm/Target/TargetInstrInfo.h Wed Sep  4 16:00:08 2013
@@ -615,6 +615,8 @@ public:
     return false;
   }
 
+  virtual bool enableClusterLoads() const { return false; }
+
   virtual bool shouldClusterLoads(MachineInstr *FirstLdSt,
                                   MachineInstr *SecondLdSt,
                                   unsigned NumLoads) const {

Modified: llvm/trunk/lib/CodeGen/MachineScheduler.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineScheduler.cpp?rev=189990&r1=189989&r2=189990&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineScheduler.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineScheduler.cpp Wed Sep  4 16:00:08 2013
@@ -2753,7 +2753,7 @@ static ScheduleDAGInstrs *createConvergi
   // data and pass it to later mutations. Have a single mutation that gathers
   // the interesting nodes in one pass.
   DAG->addMutation(new CopyConstrain(DAG->TII, DAG->TRI));
-  if (EnableLoadCluster)
+  if (EnableLoadCluster && DAG->TII->enableClusterLoads())
     DAG->addMutation(new LoadClusterMutation(DAG->TII, DAG->TRI));
   if (EnableMacroFusion)
     DAG->addMutation(new MacroFusion(DAG->TII));