You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
5.9 KiB
HTML
134 lines
5.9 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
"GNU Free Documentation License".
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Function Specific Option Pragmas (Using the GNU Compiler Collection (GCC))</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Function Specific Option Pragmas (Using the GNU Compiler Collection (GCC))">
|
||
|
|
<meta name="keywords" content="Function Specific Option Pragmas (Using the GNU Compiler Collection (GCC))">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Pragmas.html#Pragmas" rel="up" title="Pragmas">
|
||
|
|
<link href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" rel="next" title="Loop-Specific Pragmas">
|
||
|
|
<link href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" rel="prev" title="Push/Pop Macro Pragmas">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="Function-Specific-Option-Pragmas"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" accesskey="n" rel="next">Loop-Specific Pragmas</a>, Previous: <a href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" accesskey="p" rel="prev">Push/Pop Macro Pragmas</a>, Up: <a href="Pragmas.html#Pragmas" accesskey="u" rel="up">Pragmas</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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Function-Specific-Option-Pragmas-1"></a>
|
||
|
|
<h4 class="subsection">6.61.15 Function Specific Option Pragmas</h4>
|
||
|
|
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><code>#pragma GCC target (<var>"string"</var>...)</code></dt>
|
||
|
|
<dd><a name="index-pragma-GCC-target"></a>
|
||
|
|
|
||
|
|
<p>This pragma allows you to set target specific options for functions
|
||
|
|
defined later in the source file. One or more strings can be
|
||
|
|
specified. Each function that is defined after this point is as
|
||
|
|
if <code>attribute((target("STRING")))</code> was specified for that
|
||
|
|
function. The parenthesis around the options is optional.
|
||
|
|
See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the
|
||
|
|
<code>target</code> attribute and the attribute syntax.
|
||
|
|
</p>
|
||
|
|
<p>The <code>#pragma GCC target</code> pragma is presently implemented for
|
||
|
|
x86, ARM, AArch64, PowerPC, S/390, and Nios II targets only.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>#pragma GCC optimize (<var>"string"</var>...)</code></dt>
|
||
|
|
<dd><a name="index-pragma-GCC-optimize"></a>
|
||
|
|
|
||
|
|
<p>This pragma allows you to set global optimization options for functions
|
||
|
|
defined later in the source file. One or more strings can be
|
||
|
|
specified. Each function that is defined after this point is as
|
||
|
|
if <code>attribute((optimize("STRING")))</code> was specified for that
|
||
|
|
function. The parenthesis around the options is optional.
|
||
|
|
See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the
|
||
|
|
<code>optimize</code> attribute and the attribute syntax.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>#pragma GCC push_options</code></dt>
|
||
|
|
<dt><code>#pragma GCC pop_options</code></dt>
|
||
|
|
<dd><a name="index-pragma-GCC-push_005foptions"></a>
|
||
|
|
<a name="index-pragma-GCC-pop_005foptions"></a>
|
||
|
|
|
||
|
|
<p>These pragmas maintain a stack of the current target and optimization
|
||
|
|
options. It is intended for include files where you temporarily want
|
||
|
|
to switch to using a different ‘<samp>#pragma GCC target</samp>’ or
|
||
|
|
‘<samp>#pragma GCC optimize</samp>’ and then to pop back to the previous
|
||
|
|
options.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>#pragma GCC reset_options</code></dt>
|
||
|
|
<dd><a name="index-pragma-GCC-reset_005foptions"></a>
|
||
|
|
|
||
|
|
<p>This pragma clears the current <code>#pragma GCC target</code> and
|
||
|
|
<code>#pragma GCC optimize</code> to use the default switches as specified
|
||
|
|
on the command line.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|