[Omp] About iteration determination for #omp for

[NovaElf]

Hi there. I have 2 questions concerning iteration determination for the #omp 
for construct.

Does each thread do some calculation to find out which slices of the 
iterations it should be taking? Since the calculation can only be done on 
entry to the #omp for construct, and there is no barrier on entry, any 
thread can arrive first, so it seems impossible for one thread to be 
handling that job.

A second question is, the #omp for loop has some loop invariant 
restrictions. However, if I purposely violate those restrictions, will it 
result in compile time error or will it only result in incorrect execution?

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