Inline asm in HQ#X prevents compiling in 64bit

[Edward850]

For whatever reason, the hq2/3/4x filters a filled with inline assembler functions. Inline assembler, however, cannot be used in 64bit, so something about these functions needs to change.

[Graf Zahl]

That code must be disabled for 64 bit, I thought this had already been set up in the code, as it worked in older builds.

You can see that there are two sets of HQnX, the other one being plain C++. The assembly version was brought back because it creates far superior results.

[_mental_]

I implemented the same hqnx as assembly version by using MMX intrinsics.
There was an intention to enable this scaler for compilers without Microsoft inline assemble support. But this should help for x64 Windows build too.
Let me know if you are interested in it. I'm asking, because it's not a big deal to make a pull request with just code. Although CMake changes might take some time, as I am using this implementation to build for OS X only via custom Xcode project.

[Graf Zahl]

If it's the same algorithm but gets rid of the inline assembly, I'd gladly take it.

[_mental_]

I just did a quick test. Sad but Microsoft removed MMX intrisics in x64 for some reason. 32-bit build is OK.
Actually, code compiles just fine for 64-bit. But all intrinsics are treated as regular functions, leading to unresolved errors during linking.
Looks like the same algorithm needs to be rewritten using SSE2. Surely this will take some time.