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While the third example can be partially normalized to allow some parallelization, but still lack the ability to know the loop span (how many iterations there will be), making it harder to vectorize by using multi-media hardware.
Starting at 7 is not so much of a problem, as long as the increment is regular, preferably one. When multiple statements inside the loop use the index, some private temporary variables may be created to cope with the different iteration paces.
===Impossible conversions===
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