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| <h4 class="subsection">6.54.3 MeP Pragmas</h4> |
| |
| <dl> |
| <dt><code>custom io_volatile (on|off)</code><dd><a name="index-pragma_002c-custom-io_005fvolatile-3123"></a>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. |
| |
| <br><dt><code>GCC coprocessor available </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-available-3124"></a>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: |
| |
| <pre class="example"> #pragma GCC coprocessor available $c0...$c10, $c28 |
| </pre> |
| <br><dt><code>GCC coprocessor call_saved </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-call_005fsaved-3125"></a>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: |
| |
| <pre class="example"> #pragma GCC coprocessor call_saved $c4...$c6, $c31 |
| </pre> |
| <br><dt><code>GCC coprocessor subclass '(A|B|C|D)' = </code><var>registers</var><dd><a name="index-pragma_002c-coprocessor-subclass-3126"></a>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: |
| |
| <pre class="example"> #pragma GCC coprocessor subclass 'B' = $c2, $c4, $c6 |
| |
| asm ("cpfoo %0" : "=B" (x)); |
| </pre> |
| <br><dt><code>GCC disinterrupt </code><var>name</var><code> , </code><var>name</var><code> ...</code><dd><a name="index-pragma_002c-disinterrupt-3127"></a>For the named functions, the compiler adds code to disable interrupts |
| for the duration of those functions. Any functions so named, which |
| are not encountered in the source, cause a warning that the pragma was |
| not used. Examples: |
| |
| <pre class="example"> #pragma disinterrupt foo |
| #pragma disinterrupt bar, grill |
| int foo () { ... } |
| </pre> |
| <br><dt><code>GCC call </code><var>name</var><code> , </code><var>name</var><code> ...</code><dd><a name="index-pragma_002c-call-3128"></a>For the named functions, the compiler always uses a register-indirect |
| call model when calling the named functions. Examples: |
| |
| <pre class="example"> extern int foo (); |
| #pragma call foo |
| </pre> |
| </dl> |
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