mi-sched: Load clustering is a bit to expensive to enable unconditionally.

llvm-svn: 189990

Author: atrick

llvm/include/llvm/Target/TargetInstrInfo.h

@@ -615,6 +615,8 @@ class TargetInstrInfo : public MCInstrInfo {
     return false;
   }
 
+  virtual bool enableClusterLoads() const { return false; }
+
   virtual bool shouldClusterLoads(MachineInstr *FirstLdSt,
                                   MachineInstr *SecondLdSt,
                                   unsigned NumLoads) const {

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -2753,7 +2753,7 @@ static ScheduleDAGInstrs *createConvergingSched(MachineSchedContext *C) {
   // 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));