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diff --git a/lib/Transforms/Utils/CloneModule.cpp b/lib/Transforms/Utils/CloneModule.cpp
new file mode 100644
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+++ b/lib/Transforms/Utils/CloneModule.cpp
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+//===- CloneModule.cpp - Clone an entire module ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the CloneModule interface which makes a copy of an
+// entire module.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Utils/Cloning.h"
+#include "llvm/Module.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/SymbolTable.h"
+#include "llvm/Constant.h"
+#include "ValueMapper.h"
+using namespace llvm;
+
+/// CloneModule - Return an exact copy of the specified module.  This is not as
+/// easy as it might seem because we have to worry about making copies of global
+/// variables and functions, and making their (initializers and references,
+/// respectively) refer to the right globals.
+///
+Module *llvm::CloneModule(const Module *M) {
+  // First off, we need to create the new module...
+  Module *New = new Module(M->getModuleIdentifier());
+  New->setEndianness(M->getEndianness());
+  New->setPointerSize(M->getPointerSize());
+
+  // Copy all of the type symbol table entries over...
+  const SymbolTable &SymTab = M->getSymbolTable();
+  SymbolTable::type_const_iterator TypeI = SymTab.type_begin();
+  SymbolTable::type_const_iterator TypeE = SymTab.type_end();
+  for ( ; TypeI != TypeE; ++TypeI ) {
+    New->addTypeName(TypeI->first, TypeI->second);
+  }
+
+  // Create the value map that maps things from the old module over to the new
+  // module.
+  std::map<const Value*, Value*> ValueMap;
+
+  // Loop over all of the global variables, making corresponding globals in the
+  // new module.  Here we add them to the ValueMap and to the new Module.  We
+  // don't worry about attributes or initializers, they will come later.
+  //
+  for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
+       I != E; ++I)
+    ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
+                                     GlobalValue::ExternalLinkage, 0,
+                                     I->getName(), New);
+
+  // Loop over the functions in the module, making external functions as before
+  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
+    Function *NF =
+      new Function(cast<FunctionType>(I->getType()->getElementType()),
+                   GlobalValue::ExternalLinkage, I->getName(), New);
+    NF->setCallingConv(I->getCallingConv());
+    ValueMap[I]= NF;
+  }
+
+  // Now that all of the things that global variable initializer can refer to
+  // have been created, loop through and copy the global variable referrers
+  // over...  We also set the attributes on the global now.
+  //
+  for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
+       I != E; ++I) {
+    GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
+    if (I->hasInitializer())
+      GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
+                                                 ValueMap)));
+    GV->setLinkage(I->getLinkage());
+  }
+
+  // Similarly, copy over function bodies now...
+  //
+  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
+    Function *F = cast<Function>(ValueMap[I]);
+    if (!I->isExternal()) {
+      Function::arg_iterator DestI = F->arg_begin();
+      for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
+           ++J) {
+        DestI->setName(J->getName());
+        ValueMap[J] = DestI++;
+      }
+
+      std::vector<ReturnInst*> Returns;  // Ignore returns cloned...
+      CloneFunctionInto(F, I, ValueMap, Returns);
+    }
+
+    F->setLinkage(I->getLinkage());
+  }
+
+  return New;
+}
+
+// vim: sw=2