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Vectorization

In which cases can loop be vectorized?

DO I = 1, N-1
  A(I) = A(I+1)*B(I)
ENDDO

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V

A(1:128) = A(2:129)*B(1:128)
A(129:256) = A(130:257)*B(129:256)
....

Vectorization preserves semantics.