Azure Worker Role VM specifications

How can we learn the specifications of the Virtual Machine on which we are running the worker role? I call C++ functions and some functions use SIMD instructions and threads. My question is: Is there an instructional limit on the running code? Obviously, visual studio creates compatible code when the project is targeted for azure platform. But what happens if 开发者_运维百科I call a dll function? Is it always safe if the dll is compiled for an x64 PC?

Windows Azure runs entirely on 64 bit, which they don't mention as a feature as such, it's just mentioned throughout the documentation. It tends to come up when people want to run 32 bit dlls. There is a lesson in the training kit for building your own c++ dlls to run on Windows Azure. The short version is that if you're only ever running your .dll on 64 bit machines, compiling for x64 is fine.