Optimisation

A few years ago I saw a thread somewhere explaining things like...

Code:

---

//C++
i=1000
while(--i)
{}

//is faster than

//C++
for(i = 999; i > -1; i--)
{}

---

and

Code:

---

i++;
i++;
i++;
i++;
i++;
i++;

//is faster than

i+=6;

//(for numbers less than about 7

---

Are these things true? And if so is it also true for .Net (managed programs)? Does anyone know if the original thread is still available.

depends on what compiler you use

I think that in good compilers the output will be about the same