diff --git a/tools/llvm-as/llvm-as.cpp b/tools/llvm-as/llvm-as.cpp
new file mode 100644
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--- /dev/null
+++ b/tools/llvm-as/llvm-as.cpp
@@ -0,0 +1,141 @@
+//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
+//
+//                     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 utility may be invoked in the following manner:
+//   llvm-as --help         - Output information about command line switches
+//   llvm-as [options]      - Read LLVM asm from stdin, write bitcode to stdout
+//   llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
+//                            to the x.bc file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Module.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/System/Signals.h"
+#include <fstream>
+#include <iostream>
+#include <memory>
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+               cl::value_desc("filename"));
+
+static cl::opt<bool>
+Force("f", cl::desc("Overwrite output files"));
+
+static cl::opt<bool>
+DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
+
+static cl::opt<bool>
+DisableVerify("disable-verify", cl::Hidden,
+              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
+
+int main(int argc, char **argv) {
+  llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
+  cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
+  sys::PrintStackTraceOnErrorSignal();
+
+  int exitCode = 0;
+  std::ostream *Out = 0;
+  try {
+    // Parse the file now...
+    ParseError Err;
+    std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename,&Err));
+    if (M.get() == 0) {
+      cerr << argv[0] << ": " << Err.getMessage() << "\n"; 
+      return 1;
+    }
+
+    if (!DisableVerify) {
+      std::string Err;
+      if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
+        cerr << argv[0]
+             << ": assembly parsed, but does not verify as correct!\n";
+        cerr << Err;
+        return 1;
+      } 
+    }
+
+    if (DumpAsm) cerr << "Here's the assembly:\n" << *M.get();
+
+    if (OutputFilename != "") {   // Specified an output filename?
+      if (OutputFilename != "-") {  // Not stdout?
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          cerr << argv[0] << ": error opening '" << OutputFilename
+               << "': file exists!\n"
+               << "Use -f command line argument to force output\n";
+          return 1;
+        }
+        Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
+                                std::ios::trunc | std::ios::binary);
+      } else {                      // Specified stdout
+        // FIXME: cout is not binary!
+        Out = &std::cout;
+      }
+    } else {
+      if (InputFilename == "-") {
+        OutputFilename = "-";
+        Out = &std::cout;
+      } else {
+        std::string IFN = InputFilename;
+        int Len = IFN.length();
+        if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
+          // Source ends in .ll
+          OutputFilename = std::string(IFN.begin(), IFN.end()-3);
+        } else {
+          OutputFilename = IFN;   // Append a .bc to it
+        }
+        OutputFilename += ".bc";
+
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          cerr << argv[0] << ": error opening '" << OutputFilename
+               << "': file exists!\n"
+               << "Use -f command line argument to force output\n";
+          return 1;
+        }
+
+        Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
+                                std::ios::trunc | std::ios::binary);
+        // Make sure that the Out file gets unlinked from the disk if we get a
+        // SIGINT
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+      }
+    }
+
+    if (!Out->good()) {
+      cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+      return 1;
+    }
+
+    if (Force || !CheckBitcodeOutputToConsole(Out,true))
+      WriteBitcodeToFile(M.get(), *Out);
+  } catch (const std::string& msg) {
+    cerr << argv[0] << ": " << msg << "\n";
+    exitCode = 1;
+  } catch (...) {
+    cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+    exitCode = 1;
+  }
+
+  if (Out != &std::cout) delete Out;
+  return exitCode;
+}
+