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 <p>
 Next: <a href="TI-C6X-Built_002din-Functions.html#TI-C6X-Built_002din-Functions" accesskey="n" rel="next">TI C6X Built-in Functions</a>, Previous: <a href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions" accesskey="p" rel="prev">SPARC VIS Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<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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 <hr>
 <a name="SPU-Built_002din-Functions-1"></a>
 <h4 class="subsection">6.57.28 SPU Built-in Functions</h4>

 <p>GCC provides extensions for the SPU processor as described in the
 Sony/Toshiba/IBM SPU Language Extensions Specification, which can be
 found at <a href="http://cell.scei.co.jp/">http://cell.scei.co.jp/</a> or
 <a href="http://www.ibm.com/developerworks/power/cell/">http://www.ibm.com/developerworks/power/cell/</a>.  GCC&rsquo;s
 implementation differs in several ways.
 </p>
 <ul>
 <li> The optional extension of specifying vector constants in parentheses is
 not supported.

 </li><li> A vector initializer requires no cast if the vector constant is of the
 same type as the variable it is initializing.

 </li><li> If <code>signed</code> or <code>unsigned</code> is omitted, the signedness of the
 vector type is the default signedness of the base type.  The default
 varies depending on the operating system, so a portable program should
 always specify the signedness.

 </li><li> By default, the keyword <code>__vector</code> is added. The macro
 <code>vector</code> is defined in <code>&lt;spu_intrinsics.h&gt;</code> and can be
 undefined.

 </li><li> GCC allows using a <code>typedef</code> name as the type specifier for a
 vector type.

 </li><li> For C, overloaded functions are implemented with macros so the following
 does not work:

 <div class="smallexample">
 <pre class="smallexample">  spu_add ((vector signed int){1, 2, 3, 4}, foo);
 </pre></div>

 <p>Since <code>spu_add</code> is a macro, the vector constant in the example
 is treated as four separate arguments.  Wrap the entire argument in
 parentheses for this to work.
 </p>
 </li><li> The extended version of <code>__builtin_expect</code> is not supported.

 </li></ul>

 <p><em>Note:</em> Only the interface described in the aforementioned
 specification is supported. Internally, GCC uses built-in functions to
 implement the required functionality, but these are not supported and
 are subject to change without notice.
 </p>


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	<a name="SPU-Built_002din-Functions"></a>
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	<p>
	Next: <a href="TI-C6X-Built_002din-Functions.html#TI-C6X-Built_002din-Functions" accesskey="n" rel="next">TI C6X Built-in Functions</a>, Previous: <a href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions" accesskey="p" rel="prev">SPARC VIS Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</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="SPU-Built_002din-Functions-1"></a>
	<h4 class="subsection">6.57.28 SPU Built-in Functions</h4>

	<p>GCC provides extensions for the SPU processor as described in the
	Sony/Toshiba/IBM SPU Language Extensions Specification, which can be
	found at <a href="http://cell.scei.co.jp/">http://cell.scei.co.jp/</a> or
	<a href="http://www.ibm.com/developerworks/power/cell/">http://www.ibm.com/developerworks/power/cell/</a>. GCC’s
	implementation differs in several ways.
	</p>
	<ul>
	<li> The optional extension of specifying vector constants in parentheses is
	not supported.

	</li><li> A vector initializer requires no cast if the vector constant is of the
	same type as the variable it is initializing.

	</li><li> If <code>signed</code> or <code>unsigned</code> is omitted, the signedness of the
	vector type is the default signedness of the base type. The default
	varies depending on the operating system, so a portable program should
	always specify the signedness.

	</li><li> By default, the keyword <code>__vector</code> is added. The macro
	<code>vector</code> is defined in <code><spu_intrinsics.h></code> and can be
	undefined.

	</li><li> GCC allows using a <code>typedef</code> name as the type specifier for a
	vector type.

	</li><li> For C, overloaded functions are implemented with macros so the following
	does not work:

	<div class="smallexample">
	<pre class="smallexample"> spu_add ((vector signed int){1, 2, 3, 4}, foo);
	</pre></div>

	<p>Since <code>spu_add</code> is a macro, the vector constant in the example
	is treated as four separate arguments. Wrap the entire argument in
	parentheses for this to work.
	</p>
	</li><li> The extended version of <code>__builtin_expect</code> is not supported.

	</li></ul>

	<p><em>Note:</em> Only the interface described in the aforementioned
	specification is supported. Internally, GCC uses built-in functions to
	implement the required functionality, but these are not supported and
	are subject to change without notice.
	</p>



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