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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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| <a name="MeP-Pragmas-1"></a> |
| <h4 class="subsection">6.59.3 MeP Pragmas</h4> |
| |
| <dl compact="compact"> |
| <dt><code>custom io_volatile (on|off)</code></dt> |
| <dd><a name="index-pragma_002c-custom-io_005fvolatile"></a> |
| <p>Overrides the command-line option <code>-mio-volatile</code> for the current |
| file. Note that for compatibility with future GCC releases, this |
| option should only be used once before any <code>io</code> variables in each |
| file. |
| </p> |
| </dd> |
| <dt><code>GCC coprocessor available <var>registers</var></code></dt> |
| <dd><a name="index-pragma_002c-coprocessor-available"></a> |
| <p>Specifies which coprocessor registers are available to the register |
| allocator. <var>registers</var> may be a single register, register range |
| separated by ellipses, or comma-separated list of those. Example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">#pragma GCC coprocessor available $c0...$c10, $c28 |
| </pre></div> |
| |
| </dd> |
| <dt><code>GCC coprocessor call_saved <var>registers</var></code></dt> |
| <dd><a name="index-pragma_002c-coprocessor-call_005fsaved"></a> |
| <p>Specifies which coprocessor registers are to be saved and restored by |
| any function using them. <var>registers</var> may be a single register, |
| register range separated by ellipses, or comma-separated list of |
| those. Example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">#pragma GCC coprocessor call_saved $c4...$c6, $c31 |
| </pre></div> |
| |
| </dd> |
| <dt><code>GCC coprocessor subclass '(A|B|C|D)' = <var>registers</var></code></dt> |
| <dd><a name="index-pragma_002c-coprocessor-subclass"></a> |
| <p>Creates and defines a register class. These register classes can be |
| used by inline <code>asm</code> constructs. <var>registers</var> may be a single |
| register, register range separated by ellipses, or comma-separated |
| list of those. Example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">#pragma GCC coprocessor subclass 'B' = $c2, $c4, $c6 |
| |
| asm ("cpfoo %0" : "=B" (x)); |
| </pre></div> |
| |
| </dd> |
| <dt><code>GCC disinterrupt <var>name</var> , <var>name</var> …</code></dt> |
| <dd><a name="index-pragma_002c-disinterrupt"></a> |
| <p>For the named functions, the compiler adds code to disable interrupts |
| for the duration of those functions. If any functions so named |
| are not encountered in the source, a warning is emitted that the pragma is |
| not used. Examples: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">#pragma disinterrupt foo |
| #pragma disinterrupt bar, grill |
| int foo () { … } |
| </pre></div> |
| |
| </dd> |
| <dt><code>GCC call <var>name</var> , <var>name</var> …</code></dt> |
| <dd><a name="index-pragma_002c-call"></a> |
| <p>For the named functions, the compiler always uses a register-indirect |
| call model when calling the named functions. Examples: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">extern int foo (); |
| #pragma call foo |
| </pre></div> |
| |
| </dd> |
| </dl> |
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