x86 ASM

C++.

Is _asm{} as useful as i think it is? for example writing a function that passes it's parametersto _asm{} and then does some loops/if's etc then returns back. That would be more efficient (for mass/batch use) than if i wrote the function in C++ right?

I've never gotten the point of inline assembly (except for platform-specific magic in system libraries); surely, you cannot write it as freely as you could if you wrote the whole program?  The other registers must surely be troubled by the inline code messing things up?