- _M_IX86_FP defines whether VS should generate code using SSE or SSE2
instructions. It isn't correct to use it to check whether optional runtime
optimizations should be compiled in. It's also not defined at all in 64-bit
mode.
- So let's just keep it simple and give a list of everything that is supported
as release optimizations. It's not clear from the documentation if all of
these are really supported. It just list a bunch of intrinsics from these
that are.