diff --git a/llvm/utils/TableGen/CallingConvEmitter.cpp b/llvm/utils/TableGen/CallingConvEmitter.cpp
new file mode 100644
index 000000000000..977191f92d3c
--- /dev/null
+++ b/llvm/utils/TableGen/CallingConvEmitter.cpp
@@ -0,0 +1,128 @@
+//===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tablegen backend is responsible for emitting descriptions of the calling
+// conventions supported by this target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CallingConvEmitter.h"
+#include "Record.h"
+#include "CodeGenTarget.h"
+using namespace llvm;
+
+void CallingConvEmitter::run(std::ostream &O) {
+  EmitSourceFileHeader("Calling Convention Implementation Fragment", O);
+
+  std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
+  
+  // Emit prototypes for all of the CC's so that they can forward ref each
+  // other.
+  for (unsigned i = 0, e = CCs.size(); i != e; ++i) {
+    O << "static bool " << CCs[i]->getName()
+      << "(unsigned ValNo, MVT::ValueType ValVT, MVT::ValueType LocVT,\n"
+      << std::string(CCs[i]->getName().size()+13, ' ')
+      << "CCValAssign::LocInfo LocInfo, unsigned ArgFlags, CCState &State);\n";
+  }
+  
+  // Emit each calling convention description in full.
+  for (unsigned i = 0, e = CCs.size(); i != e; ++i)
+    EmitCallingConv(CCs[i], O);
+}
+
+
+void CallingConvEmitter::EmitCallingConv(Record *CC, std::ostream &O) {
+  ListInit *CCActions = CC->getValueAsListInit("Actions");
+  Counter = 0;
+
+  O << "\n\nstatic bool " << CC->getName()
+    << "(unsigned ValNo, MVT::ValueType ValVT, MVT::ValueType LocVT,\n"
+    << std::string(CC->getName().size()+13, ' ')
+    << "CCValAssign::LocInfo LocInfo, "
+    << "unsigned ArgFlags, CCState &State) {\n";
+      
+  // Emit all of the actions, in order.
+  for (unsigned i = 0, e = CCActions->getSize(); i != e; ++i) {
+    O << "\n";
+    EmitAction(CCActions->getElementAsRecord(i), 2, O);
+  }
+  
+  O << "\n  return true;  // CC didn't match.\n";
+  O << "}\n";
+}
+
+void CallingConvEmitter::EmitAction(Record *Action,
+                                    unsigned Indent, std::ostream &O) {
+  std::string IndentStr = std::string(Indent, ' ');
+  
+  if (Action->isSubClassOf("CCPredicateAction")) {
+    O << IndentStr << "if (";
+    
+    if (Action->isSubClassOf("CCMatchType")) {
+      ListInit *VTs = Action->getValueAsListInit("VTs");
+      for (unsigned i = 0, e = VTs->getSize(); i != e; ++i) {
+        Record *VT = VTs->getElementAsRecord(i);
+        if (i != 0) O << " || \n    " << IndentStr;
+        O << "LocVT == " << getEnumName(getValueType(VT));
+      }
+
+    } else if (Action->isSubClassOf("CCMatchIf")) {
+      O << Action->getValueAsString("Predicate");
+    } else {
+      Action->dump();
+      throw "Unknown CCPredicateAction!";
+    }
+    
+    O << ") {\n";
+    EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O);
+    O << IndentStr << "}\n";
+  } else {
+    if (Action->isSubClassOf("CCDelegateTo")) {
+      Record *CC = Action->getValueAsDef("CC");
+      O << IndentStr << "if (!" << CC->getName()
+        << "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n"
+        << IndentStr << "  return false;\n";
+    } else if (Action->isSubClassOf("CCAssignToReg")) {
+      ListInit *RegList = Action->getValueAsListInit("RegList");
+      if (RegList->getSize() == 1) {
+        O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
+        O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
+      } else {
+        O << IndentStr << "static const unsigned RegList" << ++Counter
+          << "[] = {\n";
+        O << IndentStr << "  ";
+        for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
+          if (i != 0) O << ", ";
+          O << getQualifiedName(RegList->getElementAsRecord(i));
+        }
+        O << "\n" << IndentStr << "};\n";
+        O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
+          << Counter << ", " << RegList->getSize() << ")) {\n";
+      }
+      O << IndentStr << "  State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
+        << "Reg, LocVT, LocInfo));\n";
+      O << IndentStr << "  return false;\n";
+      O << IndentStr << "}\n";
+    } else if (Action->isSubClassOf("CCAssignToStack")) {
+      int Size = Action->getValueAsInt("Size");
+      int Align = Action->getValueAsInt("Align");
+      
+      O << IndentStr << "unsigned Offset" << ++Counter
+        << " = State.AllocateStack(" << Size << ", " << Align << ");\n";
+      O << IndentStr << "State.addLoc(CCValAssign::getMem(ValNo, ArgVT, Offset"
+        << Counter << ", LocVT, LocInfo));\n";
+      O << IndentStr << "return false;\n";
+    } else if (Action->isSubClassOf("CCPromoteToType")) {
+      
+    } else {
+      Action->dump();
+      throw "Unknown CCAction!";
+    }
+  }
+}
\ No newline at end of file
diff --git a/llvm/utils/TableGen/CallingConvEmitter.h b/llvm/utils/TableGen/CallingConvEmitter.h
new file mode 100644
index 000000000000..a0bfab3e75cf
--- /dev/null
+++ b/llvm/utils/TableGen/CallingConvEmitter.h
@@ -0,0 +1,38 @@
+//===- CallingConvEmitter.h - Generate calling conventions ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tablegen backend is responsible for emitting descriptions of the calling
+// conventions supported by this target.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CALLINGCONV_EMITTER_H
+#define CALLINGCONV_EMITTER_H
+
+#include "TableGenBackend.h"
+#include <map>
+#include <vector>
+#include <cassert>
+
+namespace llvm {
+  class CallingConvEmitter : public TableGenBackend {
+    RecordKeeper &Records;
+  public:
+    CallingConvEmitter(RecordKeeper &R) : Records(R) {}
+
+    // run - Output the asmwriter, returning true on failure.
+    void run(std::ostream &o);
+    
+  private:
+    void EmitCallingConv(Record *CC, std::ostream &O);
+    void EmitAction(Record *Action, unsigned Indent, std::ostream &O);
+    unsigned Counter;
+  };
+}
+#endif