113 lines
5.1 KiB
HTML
113 lines
5.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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You have freedom to copy and modify this GNU Manual, like GNU
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: OpenACC</title>
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<meta name="description" content="The GNU Fortran Compiler: OpenACC">
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<meta name="keywords" content="The GNU Fortran Compiler: OpenACC">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" rel="up" title="Extensions implemented in GNU Fortran">
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<link href="Argument-list-functions.html#Argument-list-functions" rel="next" title="Argument list functions">
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<link href="OpenMP.html#OpenMP" rel="prev" title="OpenMP">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="OpenACC"></a>
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<div class="header">
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<p>
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Next: <a href="Argument-list-functions.html#Argument-list-functions" accesskey="n" rel="next">Argument list functions</a>, Previous: <a href="OpenMP.html#OpenMP" accesskey="p" rel="prev">OpenMP</a>, Up: <a href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" accesskey="u" rel="up">Extensions implemented in GNU Fortran</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="OpenACC-1"></a>
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<h4 class="subsection">6.1.17 OpenACC</h4>
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<a name="index-OpenACC-1"></a>
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<p>OpenACC is an application programming interface (API) that supports
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offloading of code to accelerator devices. It consists of a set of
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compiler directives, library routines, and environment variables that
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influence run-time behavior.
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</p>
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<p>GNU Fortran strives to be compatible to the
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<a href="http://www.openacc.org/">OpenACC Application Programming
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Interface v2.0</a>.
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</p>
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<p>To enable the processing of the OpenACC directive <code>!$acc</code> in
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free-form source code; the <code>c$acc</code>, <code>*$acc</code> and <code>!$acc</code>
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directives in fixed form; the <code>!$</code> conditional compilation
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sentinels in free form; and the <code>c$</code>, <code>*$</code> and <code>!$</code>
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sentinels in fixed form, <code>gfortran</code> needs to be invoked with
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the <samp>-fopenacc</samp>. This also arranges for automatic linking of
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the GNU Offloading and Multi Processing Runtime Library
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<a href="http://gcc.gnu.org/onlinedocs/libgomp/index.html#Top">libgomp</a> in <cite>GNU Offloading and Multi Processing Runtime
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Library</cite>.
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</p>
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<p>The OpenACC Fortran runtime library routines are provided both in a
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form of a Fortran 90 module named <code>openacc</code> and in a form of a
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Fortran <code>include</code> file named <samp>openacc_lib.h</samp>.
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</p>
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<p>Note that this is an experimental feature, incomplete, and subject to
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change in future versions of GCC. See
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<a href="https://gcc.gnu.org/wiki/OpenACC">https://gcc.gnu.org/wiki/OpenACC</a> for more information.
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</p>
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</body>
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</html>
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