diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h
index 99a4c3d..a04189c 100644
--- a/include/llvm/CodeGen/MachineFrameInfo.h
+++ b/include/llvm/CodeGen/MachineFrameInfo.h
@@ -102,8 +102,14 @@
     // default, fixed objects are immutable unless marked otherwise.
     bool isImmutable;
 
-    StackObject(uint64_t Sz, unsigned Al, int64_t SP = 0, bool IM = false)
-      : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM) {}
+    // isSpillSlot - If true, the stack object is used as spill slot. It
+    // cannot alias any other memory objects.
+    bool isSpillSlot;
+
+    StackObject(uint64_t Sz, unsigned Al, int64_t SP = 0, bool IM = false,
+                bool isSS = false)
+      : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
+        isSpillSlot(isSS) {}
   };
 
   /// Objects - The list of stack objects allocated...
@@ -352,6 +358,14 @@
     return Objects[ObjectIdx+NumFixedObjects].isImmutable;
   }
 
+  /// isSpillSlotObjectIndex - Returns true if the specified index corresponds
+  /// to a spill slot..
+  bool isSpillSlotObjectIndex(int ObjectIdx) const {
+    assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
+           "Invalid Object Idx!");
+    return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;;
+  }
+
   /// isDeadObjectIndex - Returns true if the specified index corresponds to
   /// a dead object.
   bool isDeadObjectIndex(int ObjectIdx) const {
@@ -363,9 +377,9 @@
   /// CreateStackObject - Create a new statically sized stack object, returning
   /// a nonnegative identifier to represent it.
   ///
-  int CreateStackObject(uint64_t Size, unsigned Alignment) {
+  int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS = false) {
     assert(Size != 0 && "Cannot allocate zero size stack objects!");
-    Objects.push_back(StackObject(Size, Alignment));
+    Objects.push_back(StackObject(Size, Alignment, 0, false, isSS));
     return (int)Objects.size()-NumFixedObjects-1;
   }
 
diff --git a/lib/CodeGen/PreAllocSplitting.cpp b/lib/CodeGen/PreAllocSplitting.cpp
index 8fa07d4..726869a 100644
--- a/lib/CodeGen/PreAllocSplitting.cpp
+++ b/lib/CodeGen/PreAllocSplitting.cpp
@@ -952,7 +952,7 @@
   if (I != IntervalSSMap.end()) {
     SS = I->second;
   } else {
-    SS = MFI->CreateStackObject(RC->getSize(), RC->getAlignment());    
+    SS = MFI->CreateStackObject(RC->getSize(), RC->getAlignment());
   }
   
   MachineInstr* FMI = TII->foldMemoryOperand(*MBB->getParent(),
diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 7af0bba..8a0b003 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -259,7 +259,7 @@
       // the TargetRegisterClass if the stack alignment is smaller. Use the
       // min.
       Align = std::min(Align, StackAlign);
-      FrameIdx = FFI->CreateStackObject(RC->getSize(), Align);
+      FrameIdx = FFI->CreateStackObject(RC->getSize(), Align, true);
       if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
       if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx;
     } else {
diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp
index 6caa2d3..28ede55 100644
--- a/lib/CodeGen/RegAllocLocal.cpp
+++ b/lib/CodeGen/RegAllocLocal.cpp
@@ -263,7 +263,7 @@
 
   // Allocate a new stack object for this spill location...
   int FrameIdx = MF->getFrameInfo()->CreateStackObject(RC->getSize(),
-                                                       RC->getAlignment());
+                                                       RC->getAlignment(),true);
 
   // Assign the slot...
   StackSlotForVirtReg[VirtReg] = FrameIdx;
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index c78f35b..cac098b 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -118,7 +118,7 @@
          "attempt to assign stack slot to already spilled register");
   const TargetRegisterClass* RC = MF->getRegInfo().getRegClass(virtReg);
   int SS = MF->getFrameInfo()->CreateStackObject(RC->getSize(),
-                                                RC->getAlignment());
+                                              RC->getAlignment(), /*isSS*/true);
   if (LowSpillSlot == NO_STACK_SLOT)
     LowSpillSlot = SS;
   if (HighSpillSlot == NO_STACK_SLOT || SS > HighSpillSlot)
@@ -162,7 +162,7 @@
   if (I != EmergencySpillSlots.end())
     return I->second;
   int SS = MF->getFrameInfo()->CreateStackObject(RC->getSize(),
-                                                RC->getAlignment());
+                                              RC->getAlignment(), /*isSS*/true);
   if (LowSpillSlot == NO_STACK_SLOT)
     LowSpillSlot = SS;
   if (HighSpillSlot == NO_STACK_SLOT || SS > HighSpillSlot)
diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index ecdf5a0..271e0a9 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -670,8 +670,11 @@
   MachineFunction &MF = *MBB.getParent();
   MachineFrameInfo &MFI = *MF.getFrameInfo();
 
+  const Value *SV = (MFI.isFixedObjectIndex(FI) ||
+                     MFI.isSpillSlotObjectIndex(FI))
+    ? PseudoSourceValue::getFixedStack(FI) : PseudoSourceValue::getStack();
   MachineMemOperand *MMO =
-    MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
+    MF.getMachineMemOperand(SV,
                             MachineMemOperand::MOStore, 0,
                             MFI.getObjectSize(FI),
                             MFI.getObjectAlignment(FI));
@@ -708,8 +711,11 @@
   MachineFunction &MF = *MBB.getParent();
   MachineFrameInfo &MFI = *MF.getFrameInfo();
 
+  const Value *SV = (MFI.isFixedObjectIndex(FI) ||
+                     MFI.isSpillSlotObjectIndex(FI))
+    ? PseudoSourceValue::getFixedStack(FI) : PseudoSourceValue::getStack();
   MachineMemOperand *MMO =
-    MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
+    MF.getMachineMemOperand(SV,
                             MachineMemOperand::MOLoad, 0,
                             MFI.getObjectSize(FI),
                             MFI.getObjectAlignment(FI));
diff --git a/lib/Target/X86/X86InstrBuilder.h b/lib/Target/X86/X86InstrBuilder.h
index c475b56..8cbdfec 100644
--- a/lib/Target/X86/X86InstrBuilder.h
+++ b/lib/Target/X86/X86InstrBuilder.h
@@ -143,8 +143,11 @@
     Flags |= MachineMemOperand::MOLoad;
   if (TID.mayStore())
     Flags |= MachineMemOperand::MOStore;
+  const Value *SV = (MFI.isFixedObjectIndex(FI) ||
+                     MFI.isSpillSlotObjectIndex(FI))
+    ? PseudoSourceValue::getFixedStack(FI) : PseudoSourceValue::getStack();
   MachineMemOperand *MMO =
-    MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
+    MF.getMachineMemOperand(SV,
                             Flags, Offset,
                             MFI.getObjectSize(FI),
                             MFI.getObjectAlignment(FI));