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The INDEPENDENT Directive

H501 independent-directive	is INDEPENDENT [ , new-clause ] [ , reduction-clause ]
H502 new-clause	is NEW ( variable-name-list )
H503 reduction-clause	is REDUCTION ( reduction-variable-list )
H504 reduction-variable	is array-variable-name or scalar-variable-name or structure-component

• The first non-comment line following an independent-directive must be a do-stmt, forall-stmt, or a forall-construct.
• If the first non-comment line following an independent-directive is a do-stmt, then that statement must contain a loop-control option containing a do-variable.
• If either the NEW clause or the REDUCTION clause is present, then the first non-comment line following the directive must be a do-stmt.
• A variable named in the NEW or the REDUCTION clause and any component or element thereof must not:
  • Be a dummy argument;
  • Have the SAVE or TARGET attribute;
  • Occur in a COMMON block;
  • Be storage associated with another object as a result of appearing in an EQUIVALENCE statement;
  • Be use associated;
  • Be host associated; or
  • Be accessed in another scoping unit via host association.

• A variable that occurs as a reduction-variable may not appear in a new-clause in the same independent-directive, nor may it appear in either a new-clause or a reduction-clause in the range (i.e., the lexical body) of the following do-stmt, forall-stmt, or forall-construct to which the independent-directive applies.
• A structure-component in a reduction-variable may not contain a subscript-section-list.
• A variable that occurs as a reduction-var must be of intrinsic type. It may not be of type CHARACTER.

H505 reduction-stmt

is variable = variable mult-op mult-operand or variable = add-operand * variable or variable = variable add-op add-operand or variable = level-2-expr + variable or variable = variable and-op and-operand or variable = and-operand and-op variable or variable = variable or-op or-operand or variable = or-operand or-op variable or variable = variable equiv-op equiv-operand or variable = equiv-operand equiv-op variable or variable = reduction-function ( variable , expr ) or variable = reduction-function ( expr , variable )

H506 reduction-function

is MAX or MIN or IAND or IOR or IEOR

• The two occurances of variable in a reduction-stmt must be textually identical.