Subzero. Native 64-bit int arithmetic on x86-64.

crosstest/test_calling_conv_main.cpp

 //===- subzero/crosstest/test_calling_conv_main.cpp - Driver for tests ----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains the driver for cross testing the compatibility of
@@ skipping 144 matching lines @@
         ++Failures;
         std::cout << "testCallee(Caller=" << Funcs[f].CallerName
                   << ", Callee=" << Funcs[f].CalleeName << ", ArgNum=" << ArgNum
                   << ")\nsz =" << bufAsString(BufSz)
                   << "\nllc=" << bufAsString(BufLlc) << "\n";
       }
     }
   }
 }
 
+#ifdef X8664_STACK_HACK
+extern "C" int wrapped_main(int argc, char *argv[]) {
+#else  // !defined(X8664_STACK_HACK)
 int main(int argc, char *argv[]) {
+#endif // X8664_STACK_HACK
   size_t TotalTests = 0;
   size_t Passes = 0;
   size_t Failures = 0;
 
   testCaller(TotalTests, Passes, Failures);
   testCallee(TotalTests, Passes, Failures);
 
   std::cout << "TotalTests=" << TotalTests << " Passes=" << Passes
             << " Failures=" << Failures << "\n";
 
   return Failures;
 }