A reduction participating clause specifies a task or a SIMD lane as a participant in a reduction defined by a reduction scoping clause. All properties common to all reduction clauses, which are defined in Section 5.5.5, apply to reduction participating clauses.
Accesses to the original list item may be replaced by accesses to copies of the original list item created by a region that corresponds to a construct with a reduction scoping clause.
In any case, the final value of the reduction must be determined as if all tasks or SIMD lanes that participate in the reduction are executed sequentially in some arbitrary order.