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104 lines
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104 lines
5.1 KiB
HTML
4 years ago
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<title>MeP Pragmas - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link rel="up" href="Pragmas.html#Pragmas" title="Pragmas">
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<link rel="prev" href="M32C-Pragmas.html#M32C-Pragmas" title="M32C Pragmas">
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<link rel="next" href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas" title="RS/6000 and PowerPC Pragmas">
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Permission is granted to copy, distribute and/or modify this document
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<body>
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<div class="node">
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<a name="MeP-Pragmas"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas">RS/6000 and PowerPC Pragmas</a>,
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Previous: <a rel="previous" accesskey="p" href="M32C-Pragmas.html#M32C-Pragmas">M32C Pragmas</a>,
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Up: <a rel="up" accesskey="u" href="Pragmas.html#Pragmas">Pragmas</a>
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<hr>
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</div>
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<h4 class="subsection">6.60.3 MeP Pragmas</h4>
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<dl>
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<dt><code>custom io_volatile (on|off)</code><dd><a name="index-pragma_002c-custom-io_005fvolatile-4162"></a>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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<br><dt><code>GCC coprocessor available </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-available-4163"></a>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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<pre class="smallexample"> #pragma GCC coprocessor available $c0...$c10, $c28
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</pre>
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<br><dt><code>GCC coprocessor call_saved </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-call_005fsaved-4164"></a>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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<pre class="smallexample"> #pragma GCC coprocessor call_saved $c4...$c6, $c31
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</pre>
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<br><dt><code>GCC coprocessor subclass '(A|B|C|D)' = </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-subclass-4165"></a>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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<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>
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<br><dt><code>GCC disinterrupt </code><var>name</var><code> , </code><var>name</var><code> ...</code><dd><a name="index-pragma_002c-disinterrupt-4166"></a>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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<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>
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<br><dt><code>GCC call </code><var>name</var><code> , </code><var>name</var><code> ...</code><dd><a name="index-pragma_002c-call-4167"></a>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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<pre class="smallexample"> extern int foo ();
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#pragma call foo
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</pre>
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</dl>
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</body></html>
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