Go backward to Vectorization Principles Go up to Top Go forward to Partial Vectorization

Vectorization Principles

• Subscripts linear in induction variable

  Linear combination of induction variable and constants

  DO I = ...
    ... A(I+C) ... A(D*I+C) ...
  ENDDO
  

• Only innermost loop is vectorized

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

  I is constant in inner loop!