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VIEW Directive

The VIEW attribute provides a mechanism to allow the same set of abstract processors to be viewed as having different rectilinear geometries, possibly of differing rank. (This feature is sometimes loosely called ``EQUIVALENCE for processors arrangements.'')

XBNF view-directive -to -rule to to is VIEW processor-view view-attribute-stuff

view-attribute-stuff -to -rule to to is OF processor-viewed

processor-view -to -rule to to is processor-name permutation

processor-view-entity -to -rule to to is processor-name [ ( array-spec ) ] [ permutation ]

processor-viewed -to -rule to to is processor-name [ permutation ]

permutation -to -rule to to is array-constructor XBNF

• A permutation, if present, must be a constant integer array, syntactically expressed as an array constructor, whose elements are a permutation of the values , where is the rank of the associated processor-name. If it is omitted and the processor-name names a non-scalar processors arrangement, it is as if the identity permutation (/ 1, 2, ..., /) had been specified.
• The VIEW directive may appear only in a declaration-part of a program.

Note that the possibility of a VIEW directive of the form _=13_}