Thank you Kiran,

it sounds as a reason and it is very clever idea. But my code has structure like this:

void main(void)
{

initialization();

while(1) {
Save This Code
...
interpolate();
...

}

}

function interpolate is calling some other functions and the mentioned code is in one of them.

I think you are right with beginning address and returning point but isn't there a compiler to prevent from this? I think there wasn't any bad in first example and the second one has the same logical effect as first. There is only one change, in writing :)