Why no SSE2 on Windows?

[Hexenhammer]

The Visual Studio project for 0.8.0 is set not to use SSE2. I just wonder why.
Lua uses "double" (C speak) as its native number type and SSE2 really speeds up all operations on doubles.

[Boolsheet]

Because people still use Pentium II and Athlon XP processors.

Also, what I have seen is that MSVC's SSE2 code generator is shitty and is actually slower than its x87 code.

[Hexenhammer]

Thanks for the explanation!