128 lines
5.4 KiB
HTML
128 lines
5.4 KiB
HTML
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<head>
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<title>Using the GNU Compiler Collection (GCC): SPU Built-in Functions</title>
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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="Target-Builtins.html#Target-Builtins" rel="up" title="Target Builtins">
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<link href="TI-C6X-Built_002din-Functions.html#TI-C6X-Built_002din-Functions" rel="next" title="TI C6X Built-in Functions">
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<a name="SPU-Built_002din-Functions"></a>
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<p>
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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>
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</div>
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<hr>
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<a name="SPU-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.27 SPU Built-in Functions</h4>
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<p>GCC provides extensions for the SPU processor as described in the
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Sony/Toshiba/IBM SPU Language Extensions Specification. GCC’s
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implementation differs in several ways.
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</p>
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<ul>
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<li> The optional extension of specifying vector constants in parentheses is
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not supported.
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</li><li> A vector initializer requires no cast if the vector constant is of the
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same type as the variable it is initializing.
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</li><li> If <code>signed</code> or <code>unsigned</code> is omitted, the signedness of the
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vector type is the default signedness of the base type. The default
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varies depending on the operating system, so a portable program should
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always specify the signedness.
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</li><li> By default, the keyword <code>__vector</code> is added. The macro
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<code>vector</code> is defined in <code><spu_intrinsics.h></code> and can be
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undefined.
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</li><li> GCC allows using a <code>typedef</code> name as the type specifier for a
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vector type.
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</li><li> For C, overloaded functions are implemented with macros so the following
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does not work:
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<div class="smallexample">
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<pre class="smallexample"> spu_add ((vector signed int){1, 2, 3, 4}, foo);
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</pre></div>
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<p>Since <code>spu_add</code> is a macro, the vector constant in the example
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is treated as four separate arguments. Wrap the entire argument in
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parentheses for this to work.
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</p>
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</li><li> The extended version of <code>__builtin_expect</code> is not supported.
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</li></ul>
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<p><em>Note:</em> Only the interface described in the aforementioned
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specification is supported. Internally, GCC uses built-in functions to
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implement the required functionality, but these are not supported and
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are subject to change without notice.
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</p>
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