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Next: <a rel="next" accesskey="n" href="TI-C6X-Built_002din-Functions.html#TI-C6X-Built_002din-Functions">TI C6X Built-in Functions</a>,
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<h4 class="subsection">6.58.26 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, which can be
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found at <a href="http://cell.scei.co.jp/">http://cell.scei.co.jp/</a> or
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<a href="http://www.ibm.com/developerworks/power/cell/">http://www.ibm.com/developerworks/power/cell/</a>. GCC's
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implementation differs in several ways.
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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>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>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>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>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>For C, overloaded functions are implemented with macros so the following
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does not work:
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<pre class="smallexample"> spu_add ((vector signed int){1, 2, 3, 4}, foo);
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</pre>
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<p class="noindent">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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<li>The extended version of <code>__builtin_expect</code> is not supported.
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</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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