Use const reference instead of vector copying.
llvm-svn: 173497
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 821a4f2..adf9a57 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -467,7 +467,8 @@
// Cache the list of excess pressure sets in this region. This will also track
// the max pressure in the scheduled code for these sets.
RegionCriticalPSets.clear();
- std::vector<unsigned> RegionPressure = RPTracker.getPressure().MaxSetPressure;
+ const std::vector<unsigned> &RegionPressure =
+ RPTracker.getPressure().MaxSetPressure;
for (unsigned i = 0, e = RegionPressure.size(); i < e; ++i) {
unsigned Limit = TRI->getRegPressureSetLimit(i);
DEBUG(dbgs() << TRI->getRegPressureSetName(i)