diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 52737a6..123ad6d 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -10,7 +10,6 @@
 #include "llvm/CodeGen/MachineModuleInfo.h"
 
 #include "llvm/Constants.h"
-#include "llvm/Analysis/ValueTracking.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineLocation.h"
@@ -207,9 +206,7 @@
   }
   virtual void Apply(std::string &Field) {
     Constant *C = CI->getOperand(I++);
-    // Fills in the string if it succeeds
-    if (!GetConstantStringInfo(C, Field))
-      Field.clear();
+    Field = C->getStringValue();
   }
   virtual void Apply(DebugInfoDesc *&Field) {
     Constant *C = CI->getOperand(I++);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 002821d..f1c2ecf 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/Constants.h"
-#include "llvm/Analysis/ValueTracking.h"
 #include "llvm/GlobalAlias.h"
 #include "llvm/GlobalVariable.h"
 #include "llvm/Intrinsics.h"
@@ -2578,7 +2577,8 @@
 
 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
 ///
-static bool isMemSrcFromString(SDOperand Src, std::string &Str) {
+static bool isMemSrcFromString(SDOperand Src, std::string &Str,
+                               uint64_t &SrcOff) {
   unsigned SrcDelta = 0;
   GlobalAddressSDNode *G = NULL;
   if (Src.getOpcode() == ISD::GlobalAddress)
@@ -2593,8 +2593,13 @@
     return false;
 
   GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
-  if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
-    return true;
+  if (GV && GV->isConstant()) {
+    Str = GV->getStringValue(false);
+    if (!Str.empty()) {
+      SrcOff += SrcDelta;
+      return true;
+    }
+  }
 
   return false;
 }
@@ -2611,7 +2616,8 @@
   bool AllowUnalign = TLI.allowsUnalignedMemoryAccesses();
 
   std::string Str;
-  bool isSrcStr = isMemSrcFromString(Src, Str);
+  uint64_t SrcOff = 0;
+  bool isSrcStr = isMemSrcFromString(Src, Str, SrcOff);
   bool isSrcConst = isa<ConstantSDNode>(Src);
   MVT VT= TLI.getOptimalMemOpType(Size, Align, isSrcConst, isSrcStr);
   if (VT != MVT::iAny) {
@@ -2706,11 +2712,11 @@
     return SDOperand();
 
   std::string Str;
-  bool CopyFromStr = isMemSrcFromString(Src, Str);
+  uint64_t SrcOff = 0, DstOff = 0;
+  bool CopyFromStr = isMemSrcFromString(Src, Str, SrcOff);
 
   SmallVector<SDOperand, 8> OutChains;
   unsigned NumMemOps = MemOps.size();
-  uint64_t SrcOff = 0, DstOff = 0;
   for (unsigned i = 0; i < NumMemOps; i++) {
     MVT VT = MemOps[i];
     unsigned VTSize = VT.getSizeInBits() / 8;