HTML version of Scripted Foils prepared 27 December 1996

Foil 26 WHERE (masked array assignment) in HPF

From CPS615-Align and Distribute in HPF Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 1 October 96. by Geoffrey C. Fox *
Secs 165.6
1 This is as in CMFortran and Maspar MPFortran with example:
  • WHERE (A .GT. 0) A = A - 100
2 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)
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