Thread: Using external ASM function in C++

pros: speed, closer hardware interaction
cons: not portable outside the architecture. Not as easy to interact with the rest of the C/C++ program.
uses: optimization, device driver programming, OS programming
example:

Code:

extern "asm"
{
    mov ax, bx
}

Code:

extern "C" void Foo(int iParams)

Parameters begin at ebp+8. Don't forget this:

Code:

push ebp
mov ebp,esp

...
...

pop ebp

Or your code will crash.