Index: include/llvm/Target/TargetInstrInfo.h
===================================================================
--- include/llvm/Target/TargetInstrInfo.h
+++ include/llvm/Target/TargetInstrInfo.h
@@ -21,6 +21,7 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/Support/BranchProbability.h"
 #include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/CodeGen/LiveIntervalAnalysis.h"
 
 namespace llvm {
 
@@ -799,7 +800,8 @@
   /// The new instruction is inserted before MI, and the client is responsible
   /// for removing the old instruction.
   MachineInstr *foldMemoryOperand(MachineBasicBlock::iterator MI,
-                                  ArrayRef<unsigned> Ops, int FrameIndex) const;
+                                  ArrayRef<unsigned> Ops, int FrameIndex,
+                                  LiveIntervals &LIS) const;
 
   /// Same as the previous version except it allows folding of any load and
   /// store from / to any address, not just from a specific stack slot.
@@ -884,7 +886,8 @@
   /// at InsertPt.
   virtual MachineInstr *foldMemoryOperandImpl(
       MachineFunction &MF, MachineInstr *MI, ArrayRef<unsigned> Ops,
-      MachineBasicBlock::iterator InsertPt, int FrameIndex) const {
+      MachineBasicBlock::iterator InsertPt, int FrameIndex,
+      LiveIntervals &LIS) const {
     return nullptr;
   }
 
Index: lib/CodeGen/InlineSpiller.cpp
===================================================================
--- lib/CodeGen/InlineSpiller.cpp
+++ lib/CodeGen/InlineSpiller.cpp
@@ -762,7 +762,7 @@
 
   MachineInstr *FoldMI =
                 LoadMI ? TII.foldMemoryOperand(MI, FoldOps, LoadMI)
-                       : TII.foldMemoryOperand(MI, FoldOps, StackSlot);
+                       : TII.foldMemoryOperand(MI, FoldOps, StackSlot, LIS);
   if (!FoldMI)
     return false;
 
Index: lib/CodeGen/TargetInstrInfo.cpp
===================================================================
--- lib/CodeGen/TargetInstrInfo.cpp
+++ lib/CodeGen/TargetInstrInfo.cpp
@@ -497,7 +497,8 @@
 /// stream.
 MachineInstr *TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
                                                  ArrayRef<unsigned> Ops,
-                                                 int FI) const {
+                                                 int FI,
+                                                 LiveIntervals &LIS) const {
   unsigned Flags = 0;
   for (unsigned i = 0, e = Ops.size(); i != e; ++i)
     if (MI->getOperand(Ops[i]).isDef())
@@ -519,7 +520,7 @@
       MBB->insert(MI, NewMI);
   } else {
     // Ask the target to do the actual folding.
-    NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, FI);
+    NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, FI, LIS);
   }
 
   if (NewMI) {
Index: lib/Target/SystemZ/SystemZInstrInfo.h
===================================================================
--- lib/Target/SystemZ/SystemZInstrInfo.h
+++ lib/Target/SystemZ/SystemZInstrInfo.h
@@ -202,7 +202,8 @@
   MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
                                       ArrayRef<unsigned> Ops,
                                       MachineBasicBlock::iterator InsertPt,
-                                      int FrameIndex) const override;
+                                      int FrameIndex,
+                                      LiveIntervals &LIS) const override;
   MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
                                       ArrayRef<unsigned> Ops,
                                       MachineBasicBlock::iterator InsertPt,
Index: lib/Target/SystemZ/SystemZInstrInfo.cpp
===================================================================
--- lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -15,6 +15,7 @@
 #include "SystemZInstrBuilder.h"
 #include "SystemZTargetMachine.h"
 #include "llvm/CodeGen/LiveVariables.h"
+#include "llvm/CodeGen/LiveIntervalAnalysis.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 
 using namespace llvm;
@@ -846,31 +847,38 @@
 
 MachineInstr *SystemZInstrInfo::foldMemoryOperandImpl(
     MachineFunction &MF, MachineInstr *MI, ArrayRef<unsigned> Ops,
-    MachineBasicBlock::iterator InsertPt, int FrameIndex) const {
+    MachineBasicBlock::iterator InsertPt, int FrameIndex,
+    LiveIntervals &LIS) const {
+  const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
   const MachineFrameInfo *MFI = MF.getFrameInfo();
   unsigned Size = MFI->getObjectSize(FrameIndex);
   unsigned Opcode = MI->getOpcode();
 
-// XXX This is an introduction of a CC def and is illegal! Reactivate
-// with a check of liveness of CC reg.
-#if 0
   if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
     if ((Opcode == SystemZ::LA || Opcode == SystemZ::LAY) &&
         isInt<8>(MI->getOperand(2).getImm()) &&
         !MI->getOperand(3).getReg()) {
-      // LA(Y) %reg, CONST(%reg) -> AGSI %mem, CONST
-      MachineInstr *BuiltMI =
-        BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
-                     get(SystemZ::AGSI))
+
+      // Check CC liveness, since new instruction introduces a dead
+      // def of CC.
+      LiveRange &CCLiveRange =
+        LIS.getRegUnit(*MCRegUnitIterator(SystemZ::CC, TRI));
+      SlotIndex MISlot = LIS.getSlotIndexes()->getInstructionIndex(*MI);
+      if (!CCLiveRange.liveAt(MISlot)) {
+        // LA(Y) %reg, CONST(%reg) -> AGSI %mem, CONST
+        MachineInstr *BuiltMI =
+          BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
+                  get(SystemZ::AGSI))
           .addFrameIndex(FrameIndex)
           .addImm(0)
           .addImm(MI->getOperand(2).getImm());
-      BuiltMI->findRegisterDefOperand(SystemZ::CC)->setIsDead(true);
-      return BuiltMI;
+        BuiltMI->findRegisterDefOperand(SystemZ::CC)->setIsDead(true);
+        CCLiveRange.createDeadDef(MISlot, LIS.getVNInfoAllocator());
+        return BuiltMI;
+      }
     }
     return nullptr;
   }
-#endif
 
   // All other cases require a single operand.
   if (Ops.size() != 1)
Index: test/CodeGen/SystemZ/int-add-12.ll
===================================================================
--- test/CodeGen/SystemZ/int-add-12.ll
+++ test/CodeGen/SystemZ/int-add-12.ll
@@ -130,7 +130,7 @@
 ; Check that adding 127 to a spilled value can use AGSI.
 define void @f11(i64 *%ptr, i32 %sel) {
 ; CHECK-LABEL: f11:
-; _CHECK: agsi {{[0-9]+}}(%r15), 127
+; CHECK: agsi {{[0-9]+}}(%r15), 127
 ; CHECK: br %r14
 entry:
   %val0 = load volatile i64 , i64 *%ptr