Index: lib/CodeGen/RegAllocGreedy.cpp
===================================================================
--- lib/CodeGen/RegAllocGreedy.cpp
+++ lib/CodeGen/RegAllocGreedy.cpp
@@ -700,7 +700,7 @@
     bool ReverseLocal = TRI->reverseLocalAssignment();
     const TargetRegisterClass &RC = *MRI->getRegClass(Reg);
     bool ForceGlobal = !ReverseLocal &&
-      (Size / SlotIndex::InstrDist) > (2 * RC.getNumRegs());
+      (Size / SlotIndex::InstrDist) > (2 * RegClassInfo.getNumAllocatableRegs(&RC));
 
     if (ExtraRegInfo[Reg].Stage == RS_Assign && !ForceGlobal && !LI->empty() &&
         LIS->intervalIsInOneMBB(*LI)) {