Passing Array Sections

The problem with passing array sections to procedures is how to describe the current mapping of the dummy arguments. The example below specifies an alignment between the actual arguments: B and Res and the align-target, A. In order to avoid any remapping when the subroutine Zubbie is invoked, the relationship (alignment) between its dummy arguments should be fully described. Specifying this alignment is going to be non-trivial due to the way in which the actual arguments are referenced (sectioned).

     REAL, DIMENSION(4,6) :: A, B
     REAL, DIMENSION(2,3) :: Res
!HPF$ PROCESSORS, DIMENSION(2,2) :: P
!HPF$ ALIGN B(:,:)   WITH A(:,:)
!HPF$ ALIGN Res(:,:) WITH A(::2,::2)
!HPF$ DISTRIBUTE (BLOCK,BLOCK) ONTO P :: A, B, Res
      ...
      CALL Zubbie(A(1:2,1::2),B(3:4,2::2),Res)

If we require a descriptive distribution, what should interface look like?

• cannot describe the mapping using only DISTRIBUTE,
• cannot simply describe relative alignment,
• must construct intermediate TEMPLATE in order to specify distribution.

Return to corresponding overview page

• Array Arguments Example 1
• Array Arguments Example 2