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diff --git a/include/llvm/CallingConv.h b/include/llvm/CallingConv.h
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+++ b/include/llvm/CallingConv.h
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+//===-- llvm/CallingConv.h - LLVM Calling Conventions -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines LLVM's set of calling conventions. 
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CALLINGCONV_H
+#define LLVM_CALLINGCONV_H
+
+namespace llvm {
+
+/// CallingConv Namespace - This namespace contains an enum with a value for
+/// the well-known calling conventions.
+///
+namespace CallingConv {
+  /// A set of enums which specify the assigned numeric values for known llvm 
+  /// calling conventions.
+  /// @brief LLVM Calling Convention Representation
+  enum ID {
+    /// C - The default llvm calling convention, compatible with C.  This
+    /// convention is the only calling convention that supports varargs calls.
+    /// As with typical C calling conventions, the callee/caller have to 
+    /// tolerate certain amounts of prototype mismatch.
+    C = 0,
+    
+    // Generic LLVM calling conventions.  None of these calling conventions
+    // support varargs calls, and all assume that the caller and callee
+    // prototype exactly match.
+
+    /// Fast - This calling convention attempts to make calls as fast as 
+    /// possible (e.g. by passing things in registers).
+    Fast = 8,
+
+    // Cold - This calling convention attempts to make code in the caller as
+    // efficient as possible under the assumption that the call is not commonly
+    // executed.  As such, these calls often preserve all registers so that the
+    // call does not break any live ranges in the caller side.
+    Cold = 9,
+
+    // Target - This is the start of the target-specific calling conventions,
+    // e.g. fastcall and thiscall on X86.
+    FirstTargetCC = 64,
+
+    /// X86_StdCall - stdcall is the calling conventions mostly used by the
+    /// Win32 API. It is basically the same as the C convention with the
+    /// difference in that the callee is responsible for popping the arguments
+    /// from the stack.
+    X86_StdCall = 64,
+
+    /// X86_FastCall - 'fast' analog of X86_StdCall. Passes first two arguments
+    /// in ECX:EDX registers, others - via stack. Callee is responsible for
+    /// stack cleaning.
+    X86_FastCall = 65
+  };
+} // End CallingConv namespace
+
+} // End llvm namespace
+
+#endif