Parallel Worksharing-Loop SIMD Construct

| OPENMP API Specification: Version 5.1 November 2020

2.16.5 Parallel Worksharing-Loop SIMD Construct

Summary The parallel worksharing-loop SIMD construct is a shortcut for specifying a parallel construct containing a worksharing-loop SIMD construct and no other statements.

Syntax

The syntax of the parallel worksharing-loop SIMD construct is as follows:

 
#pragma omp parallel for simd [clause[ [,] clause] ... ] new-line 
    loop-nest

where loop-nest is a canonical loop nest and clause can be any of the clauses accepted by the parallel or for simd directives, except the nowait clause, with identical meanings and restrictions.

The syntax of the parallel worksharing-loop SIMD construct is as follows:

 
!$omp parallel do simd [clause[ [,] clause] ... ] 
    loop-nest 
[!$omp end parallel do simd]

where loop-nest is a canonical loop nest and clause can be any of the clauses accepted by the parallel or do simd directives, with identical meanings and restrictions.

If an end parallel do simd directive is not specified, an end parallel do simd directive is assumed at the end of the loop-nest.

Description The semantics of the parallel worksharing-loop SIMD construct are identical to explicitly specifying a parallel directive immediately followed by a worksharing-loop SIMD directive.

Restrictions The restrictions for the parallel construct and the worksharing-loop SIMD construct apply except for the following explicit modifications:

If any if clause on the directive includes a directive-name-modifier then all if clauses on the directive must include a directive-name-modifier.
At most one if clause without a directive-name-modifier can appear on the directive.
At most one if clause with the parallel directive-name-modifier can appear on the directive.
At most one if clause with the simd directive-name-modifier can appear on the directive.

Cross References

parallel construct, see Section 2.6.
Canonical loop nest form, see Section 2.11.1.
Worksharing-loop SIMD construct, see Section 2.11.5.2.
if clause, see Section 2.18.
Data attribute clauses, see Section 2.21.4.

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