Free-Form Fortran Directives. STMicroelectronics PGI

Chapter 7. Using an Accelerator

#pragma acc directive-name [clause [,clause]…] new-line

Rules

In addition to the general directive rules, the following rules apply to PGI Accelerator compiler C directives:

• Each directive starts with

#pragma acc

.

• The remainder of the directive follows the C conventions for pragmas.

• White space may be used before and after the #; white space may be required to separate words in a directive.

• Preprocessing tokens following the

#pragma acc are subject to macro replacement.

• C directives are case sensitive.

• An Accelerator directive applies to the immediately following structured block or loop.

Free-Form Fortran Directives

PGI Accelerator compiler Fortran directives can be either Free-Form or Fixed-Form directives. Free-Form

Accelerator directives are specified with the

!$acc

mechanism.

Syntax

The syntax of directives in free-form source files is:

!$acc directive-name [clause [,clause]…]

Rules

In addition to the general directive rules, the following rules apply to PGI Accelerator compiler Free-Form

Fortran directives:

• The comment prefix (!) may appear in any column, but may only be preceded by white space (spaces and tabs).

• The sentinel (!$acc) must appear as a single word, with no intervening white space.

• Line length, white space, and continuation rules apply to the directive line.

• Initial directive lines must have a space after the sentinel.

• Continued directive lines must have an ampersand (&) as the last nonblank character on the line, prior to any comment placed in the directive.

• Comments may appear on the same line as the directive, starting with an exclamation point and extending to the end of the line.

• If the first nonblank character after the sentinel is an exclamation point, the line is ignored.

• Directives are case-insensitive.

• Directives cannot be embedded within continued statements.

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