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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>Nios II Function Attributes (Using the GNU Compiler Collection (GCC))</title> <meta name="description" content="Nios II Function Attributes (Using the GNU Compiler Collection (GCC))"> <meta name="keywords" content="Nios II Function Attributes (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="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes"> <link href="Nvidia-PTX-Function-Attributes.html#Nvidia-PTX-Function-Attributes" rel="next" title="Nvidia PTX Function Attributes"> <link href="NDS32-Function-Attributes.html#NDS32-Function-Attributes" rel="prev" title="NDS32 Function Attributes"> <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="Nios-II-Function-Attributes"></a> <div class="header"> <p> Next: <a href="Nvidia-PTX-Function-Attributes.html#Nvidia-PTX-Function-Attributes" accesskey="n" rel="next">Nvidia PTX Function Attributes</a>, Previous: <a href="NDS32-Function-Attributes.html#NDS32-Function-Attributes" accesskey="p" rel="prev">NDS32 Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</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="Nios-II-Function-Attributes-1"></a> <h4 class="subsection">6.31.21 Nios II Function Attributes</h4> <p>These function attributes are supported by the Nios II back end: </p> <dl compact="compact"> <dt><code>target (<var>options</var>)</code></dt> <dd><a name="index-target-function-attribute-2"></a> <p>As discussed in <a href="Common-Function-Attributes.html#Common-Function-Attributes">Common Function Attributes</a>, this attribute allows specification of target-specific compilation options. </p> <p>When compiling for Nios II, the following options are allowed: </p> <dl compact="compact"> <dt>‘<samp>custom-<var>insn</var>=<var>N</var></samp>’</dt> <dt>‘<samp>no-custom-<var>insn</var></samp>’</dt> <dd><a name="index-target_0028_0022custom_002dinsn_003dN_0022_0029-function-attribute_002c-Nios-II"></a> <a name="index-target_0028_0022no_002dcustom_002dinsn_0022_0029-function-attribute_002c-Nios-II"></a> <p>Each ‘<samp>custom-<var>insn</var>=<var>N</var></samp>’ attribute locally enables use of a custom instruction with encoding <var>N</var> when generating code that uses <var>insn</var>. Similarly, ‘<samp>no-custom-<var>insn</var></samp>’ locally inhibits use of the custom instruction <var>insn</var>. These target attributes correspond to the <samp>-mcustom-<var>insn</var>=<var>N</var></samp> and <samp>-mno-custom-<var>insn</var></samp> command-line options, and support the same set of <var>insn</var> keywords. See <a href="Nios-II-Options.html#Nios-II-Options">Nios II Options</a>, for more information. </p> </dd> <dt>‘<samp>custom-fpu-cfg=<var>name</var></samp>’</dt> <dd><a name="index-target_0028_0022custom_002dfpu_002dcfg_003dname_0022_0029-function-attribute_002c-Nios-II"></a> <p>This attribute corresponds to the <samp>-mcustom-fpu-cfg=<var>name</var></samp> command-line option, to select a predefined set of custom instructions named <var>name</var>. See <a href="Nios-II-Options.html#Nios-II-Options">Nios II Options</a>, for more information. </p></dd> </dl> </dd> </dl> </body> </html>