AS3 loop speed

What is the fastest way to loop ?
We have an integer i, and we want to increment i until it reach REPS,
fastest way ?

1)

for(i= 0;i<REPS;i++)

2)

for(i=-1;++i<REPS;)

3)

for(i= REPS;--i;)

4)

for(i= 0;(i-REPS)>>31;i++)

5)

for(i= -1;(++i-REPS)>>31;)

6)

for(i= -1;(++i-REPS)>>>31;)

All those methods are equivalents, except for 3 where we decrease i instead of increasing it..
My results:

** UPDATE: I changed and increased the value of REPS in the tests to try to get a more stable profiling.

My 2 winners :
5) for(i= -1;(++i-REPS)>>31;)
6) for(i= -1;(++i-REPS)>>>31;)

What do you get ?