From: Andrew Trick <atrick@apple.com>
Date: Wed, 4 Sep 2013 21:00:08 +0000 (+0000)
Subject: mi-sched: Load clustering is a bit to expensive to enable unconditionally.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d1d0d37a198df718b0fd1f838b7d9593b1636299;p=oota-llvm.git

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189990 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index f746daf921b..d92ad42a879 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -615,6 +615,8 @@ public:
     return false;
   }
 
+  virtual bool enableClusterLoads() const { return false; }
+
   virtual bool shouldClusterLoads(MachineInstr *FirstLdSt,
                                   MachineInstr *SecondLdSt,
                                   unsigned NumLoads) const {
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index 0aacc3a59dc..d9da8381eaa 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/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));