Loop speed

[Lucas]

What is the fastest way for a loop?

Code:

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int i=3
for i 3 sqrt(a)+1 2
,if(a%i=0) ret 0

or

Code:

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int i=3
;bucle
if(i<=sqrt(a)+1)
,if(a%i=0) ret 0
,i+2
,goto bucle

or

Code:

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int i=3
rep
,if(a%i=0) ret 0
,i+2
,if(i>sqrt(a)+1) break

or

...

in my test:
1) aprox 100 ms
2) aprox 500 ms
3) aprox 500 ms

[Gintaras]

All should be similar if same code inside. Here for is faster because sqrt is called once.

[Lucas]

Ok. Thanks.