Array Syntax

Array syntax is treated identically in HPF_CRAFT as in HPF for explicitly mapped objects. For private objects the behavior is identical to that of HPF_LOCAL. When private objects and explicitly mapped objects are combined the rules are as follows:

 
	result = rhs_1 op_1 rhs_2 op_2 ... op_m rhs_n

• If result is explicitly mapped and all rhs arrays are explicitly mapped, the work is distributed as in HPF.
• If result is private and all rhs arrays are private the computation is done on all processors as an HPF_LOCAL program would do it.
• If result is private and all rhs arrays are explicitly mapped, the work is distributed as in HPF and the values of the results are broadcast to the result on each processor.
• If result is explicitly mapped and not all rhs arrays are explicitly mapped, the results of the operation are undefined, unless all corresponding elements of all private rhs arrays have the same values.
• If result is private and some, but not all rhs arrays are explicitly mapped, the value is computed on each processor and saved to the local result.

All processors must participate in any array syntax statement in which the value of an explicitly mapped array is modified, and there is implicit barrier synchronization after the statement executes.