free 64-bit C++ compiler on Windows
Does a free (at least as in beer), working 64-bit C++ compiler on Windows exist?
I have tried mingw-w64, but apparently at the current state, optimization is not supported (and performance is the reason I need a 64-bit compiler, so that's out of the question).
Cygwin's GCC I haven't tried, but I heard it cannot compile to 64-bit binaries?
Intel C++ compiler isn't free, and worse still, it requires Visual Studio.
I don't want to use the Microsoft compiler because my code is largely GCC-centric (using intrinsics and such).
*edit* Oh, and it has to be able to compile Boost, as my project uses Boost::Thread (which mingw-w64 doesn't work with) */edit*