__int128 question

Im getting a c4235 error when trying to compile with __int128 variables. Does anyoen know which architectures support __int128 ?

Peculiar - the __int128 keyword doesn't occur in MSDN at all, according to Google and MSDN's own search.

Whatever. My guess is 64-bit platforms: IA-64 and perhaps x86/64.

Hmmm, looks like I will have to directly implement large integer functions.