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| <h4 class="subsection">6.52.15 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. |
| |
| <ul> |
| <li>The optional extension of specifying vector constants in parentheses is |
| not supported. |
| |
| <li>A vector initializer requires no cast if the vector constant is of the |
| same type as the variable it is initializing. |
| |
| <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>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>GCC allows using a <code>typedef</code> name as the type specifier for a |
| vector type. |
| |
| <li>For C, overloaded functions are implemented with macros so the following |
| does not work: |
| |
| <pre class="smallexample"> spu_add ((vector signed int){1, 2, 3, 4}, foo); |
| </pre> |
| <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. |
| |
| <li>The extended version of <code>__builtin_expect</code> is not supported. |
| |
| </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. |
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