Basic HTML version of Foils prepared 16 Sept 1995

Foil 34 WHERE (masked array assignment) in HPF

From HPFtutorial CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox(Tomasz Haupt)
This is as in CMFortran and Maspar MPFortran with example:
  • WHERE (A .GT. 0) A = A - 100
Semantics of WHERE statement:
    • 1. evaluate mask (in parallel) and store as a temporary T1
    • 2. for each i that T1(i)=.TRUE. compute T2(i)=A(i) - 100
    • 3. for each i that T1(i)=.TRUE. assign A(i)=T2(1)

© on Tue Oct 7 1997