Basic HTML version of Foils prepared August 7 98

Foil 4 B. FORALL statements, etc.
The Single-Statement FORALL

From DoD HPF Training -- 3. Parallel Constructs in HPF DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
Syntax:
  • FORALL ( index-spec-list [,mask-expr] ) forall-assignment
  • index-spec is int-variable = triplet-spec
  • forall-assignment is ordinary assignment or pointer assignment
Semantics:
  • Equivalent to array assignment in Fortran 90
  • For each value of indices, check the mask
  • Compute right-hand sides for unmasked values
  • Make assignments to left-hand sides for unmasked values
  • Multiple assignments to the same location are not standard-conforming (i.e. are undefined)
Note: FORALL is not a general-purpose parallel loop!

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