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<title>Using the GNU Compiler Collection (GCC): MeP Pragmas</title>
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<a name="MeP-Pragmas"></a>
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<div class="header">
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<p>
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Next: <a href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas" accesskey="n" rel="next">RS/6000 and PowerPC Pragmas</a>, Previous: <a href="M32C-Pragmas.html#M32C-Pragmas" accesskey="p" rel="prev">M32C Pragmas</a>, Up: <a href="Pragmas.html#Pragmas" accesskey="u" rel="up">Pragmas</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="MeP-Pragmas-1"></a>
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<h4 class="subsection">6.61.4 MeP Pragmas</h4>
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<dl compact="compact">
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<dt><code>custom io_volatile (on|off)</code></dt>
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<dd><a name="index-pragma_002c-custom-io_005fvolatile"></a>
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<p>Overrides the command-line option <code>-mio-volatile</code> for the current
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file. Note that for compatibility with future GCC releases, this
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option should only be used once before any <code>io</code> variables in each
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file.
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</p>
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</dd>
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<dt><code>GCC coprocessor available <var>registers</var></code></dt>
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<dd><a name="index-pragma_002c-coprocessor-available"></a>
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<p>Specifies which coprocessor registers are available to the register
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allocator. <var>registers</var> may be a single register, register range
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separated by ellipses, or comma-separated list of those. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#pragma GCC coprocessor available $c0...$c10, $c28
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</pre></div>
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</dd>
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<dt><code>GCC coprocessor call_saved <var>registers</var></code></dt>
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<dd><a name="index-pragma_002c-coprocessor-call_005fsaved"></a>
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<p>Specifies which coprocessor registers are to be saved and restored by
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any function using them. <var>registers</var> may be a single register,
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register range separated by ellipses, or comma-separated list of
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those. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#pragma GCC coprocessor call_saved $c4...$c6, $c31
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</pre></div>
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</dd>
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<dt><code>GCC coprocessor subclass '(A|B|C|D)' = <var>registers</var></code></dt>
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<dd><a name="index-pragma_002c-coprocessor-subclass"></a>
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<p>Creates and defines a register class. These register classes can be
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used by inline <code>asm</code> constructs. <var>registers</var> may be a single
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register, register range separated by ellipses, or comma-separated
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list of those. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#pragma GCC coprocessor subclass 'B' = $c2, $c4, $c6
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asm ("cpfoo %0" : "=B" (x));
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</pre></div>
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</dd>
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<dt><code>GCC disinterrupt <var>name</var> , <var>name</var> …</code></dt>
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<dd><a name="index-pragma_002c-disinterrupt"></a>
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<p>For the named functions, the compiler adds code to disable interrupts
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for the duration of those functions. If any functions so named
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are not encountered in the source, a warning is emitted that the pragma is
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not used. Examples:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#pragma disinterrupt foo
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#pragma disinterrupt bar, grill
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int foo () { … }
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</pre></div>
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</dd>
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<dt><code>GCC call <var>name</var> , <var>name</var> …</code></dt>
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<dd><a name="index-pragma_002c-call"></a>
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<p>For the named functions, the compiler always uses a register-indirect
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call model when calling the named functions. Examples:
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</p>
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<div class="smallexample">
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<pre class="smallexample">extern int foo ();
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#pragma call foo
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</pre></div>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas" accesskey="n" rel="next">RS/6000 and PowerPC Pragmas</a>, Previous: <a href="M32C-Pragmas.html#M32C-Pragmas" accesskey="p" rel="prev">M32C Pragmas</a>, Up: <a href="Pragmas.html#Pragmas" accesskey="u" rel="up">Pragmas</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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