Basic HTML version of Foils prepared 26 September 1996

Foil 64 Fortran77 is part of Fortran90

From HPCC Software Technologies Fall 96 -- Overview and HPF Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 26 September 96. by Geoffrey C. Fox
A=B or more interestingly
WHERE( B > 0. ) A = B
ELSEWHERE A=0.
END WHERE
can be written
DO I = n1,n2
DO J = m1,m2
IF(B(I,J) >0.) THEN A(I,J) = B(I,J)
ELSE A(i,J) = 0.
END IF
END DO
END DO
Now a good HPF compiler will recognize the DO loops can be parallelized and give the same answer for Fortran90 and Fortran77 forms but often the detection of parallelism is not clear
Note FORALL is guaranteed to be parallelizeable as by definition no side effects.

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