All new features represent useful information to the compiler
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They do not change the meaning of the program if properly used
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REDUCTION
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Choose an efficient order of evaluation for the reduction tree
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For scalar reductions, keep a local sum on each node and have a global combining phase at the end
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Alternate implementation: critical region
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For vector reductions, use same algorithm as XXX_SCATTER
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ON HOME
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Base the loop partitioning on the HOME expression
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Invert subscripting function to derive loop bounds
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Does not affect where communication/synchronization can be placed, but may change what must be communicated
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Warning: You can outsmart the compiler this way‹to your detriment
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