This is CPython64/64, which according to PyPy's Windows documentation, is an implementation of CPython that has sys.maxint == sys.maxsize == 2 ** 63 - 1 even on Win64. This implementation is made by running several phases of sed on the vanilla codebase of CPython 2.7.6, then hand-tuned to fix compilation errors, format string inconsistencies, test case failures and the like. It can pass almost all of CPython test suite, but the remaining failures are minor enough that they do not affect running PyPy.

Original README file can be found at README.original.

Since CPython64/64 is only meant to help porting PyPy to Win64, only 64-bit Windows is supported. It is known to build under Visual Studio 2010's 64-bit toolchain, and likely VS2008 as well (not tested). The build procedure is the same as vanilla CPython's.

CPython64/64 currently can pass a major portion of tests, the only remaining ones are:

test_ctypes test_distutils test_import test_macpath
test_multiprocessing test_ntpath test_posixpath

Of these failing tests, the three path-related tests also fail on regular CPython with mysterious encoding errors; test_import fails due to some UNC path handling error. Finally, test_ctypes and test_distutils failures are somewhat expected but unrelated to PyPy.

So far, CPython64/64 can run PyPy, but translation has not been attempted yet. Now anyone willing to contribute to PyPy on Win64 can step up and move on!