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The REALIGN directive is similar to the ALIGN directive but is considered executable. An array (or template) may be realigned at any time, provided it has been declared DYNAMIC (see Section ) Unlike redistribution (see Section ), realigning a data object does not cause any other object to be remapped. (However, realignment of even a single object, if it is large, could require a lot of computational and communication effort at run time; the programmer must take care when using this feature.)
Formally, the syntax of ALIGN and REALIGN is as follows:
XBNF align-directive -to -rule to to is ALIGN alignee align-directive-stuff
realign-directive -to -rule to to is REALIGN alignee align-directive-stuff -to or REALIGN align-attribute-stuff :: alignee-list
align-directive-stuff -to -rule to to is ( align-source-list ) align-with-clause
align-attribute-stuff -to -rule to to is [ ( align-source-list ) ] align-with-clause
alignee -to -rule to to is object-name
align-source -to -rule to to is : -to or * -to or align-dummy
align-dummy -to -rule to to is scalar-int-variable XBNF
Note that the possibility of an ALIGN directive of the form _=13_}
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