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

pydir/build-runtime.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import shutil
 import tempfile
 
 import targets
 from utils import shellcmd
 from utils import FindBaseNaCl
@@ skipping 106 matching lines @@
                   '-pnaclabi-allow-debug-metadata',
                   '{dir}/szrt.tmp.bc'.format(dir=tempdir),
                   '-S',
                   '-o', '{dir}/szrt.ll'.format(dir=tempdir)
             ], echo=args.verbose)
         ll_files = ['{dir}/szrt.ll'.format(dir=tempdir),
                     '{srcdir}/szrt_ll.ll'.format(srcdir=srcdir)]
 
         MakeRuntimesForTarget(targets.X8632Target, ll_files,
                               srcdir, tempdir, rtdir, args.verbose)
+        MakeRuntimesForTarget(targets.X8664Target, ll_files,
+                              srcdir, tempdir, rtdir, args.verbose)
         MakeRuntimesForTarget(targets.ARM32Target, ll_files,
                               srcdir, tempdir, rtdir, args.verbose)
 
     finally:
         try:
             shutil.rmtree(tempdir)
         except OSError as exc:
             if exc.errno != errno.ENOENT: # ENOENT - no such file or directory
                 raise # re-raise exception
 
 if __name__ == '__main__':
     main()