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Vectorization of Conditionals

DO I = 1, N
  IF (A(I).GT.0)
    A(I) = A(I)+B(I)
  ELSE
    A(I) = A(I)-B(I)
  ENDIF
ENDDO

$$

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V

M(1:N) = A(1:N).GT.0
A(1:N) = CMERGE(M, A+B, A-B)