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

crosstest/test_stacksave_main.c

 //===- subzero/crosstest/test_stacksave_main.c - Driver for tests ---------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Driver for cross testing stacksave/stackrestore intrinsics.
 //
 //===----------------------------------------------------------------------===//
 
 /* crosstest.py --test=test_stacksave.c --driver=test_stacksave_main.c \
    --prefix=Subzero_ --output=test_stacksave */
 
 #include <inttypes.h>
 #include <stdint.h>
 #include <stdio.h>
 
 #include "test_stacksave.h"
 DECLARE_TESTS()
 DECLARE_TESTS(Subzero_)
 
-int main(int argc, char **argv) {
+#ifdef X8664_STACK_HACK
+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;
   typedef uint32_t (*FuncType)(uint32_t, uint32_t, uint32_t);
   static struct {
     const char *Name;
     FuncType FuncLlc;
     FuncType FuncSz;
   } Funcs[] = {{"test_basic_vla", test_basic_vla, Subzero_test_basic_vla},
                {"test_vla_in_loop", test_vla_in_loop, Subzero_test_vla_in_loop},
@@ skipping 14 matching lines @@
         printf("Failure %s: start=%" PRIu32 ", "
                "llc=%" PRIu32 ", sz=%" PRIu32 "\n",
                Funcs[f].Name, start, llc_result, sz_result);
       }
     }
   }
   printf("TotalTests=%zu Passes=%zu Failures=%zu\n", TotalTests, Passes,
          Failures);
   return Failures;
 }