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| Next: <a href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" accesskey="n" rel="next">Loop-Specific Pragmas</a>, Previous: <a href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" accesskey="p" rel="prev">Push/Pop Macro 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="Function-Specific-Option-Pragmas-1"></a> |
| <h4 class="subsection">6.59.13 Function Specific Option Pragmas</h4> |
| |
| <dl compact="compact"> |
| <dt><code>#pragma GCC target (<var>"string"</var>...)</code></dt> |
| <dd><a name="index-pragma-GCC-target"></a> |
| |
| <p>This pragma allows you to set target specific options for functions |
| defined later in the source file. One or more strings can be |
| specified. Each function that is defined after this point is as |
| if <code>attribute((target("STRING")))</code> was specified for that |
| function. The parenthesis around the options is optional. |
| See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the |
| <code>target</code> attribute and the attribute syntax. |
| </p> |
| <p>The <code>#pragma GCC target</code> pragma is presently implemented for |
| i386/x86_64, PowerPC, and Nios II targets only. |
| </p></dd> |
| </dl> |
| |
| <dl compact="compact"> |
| <dt><code>#pragma GCC optimize (<var>"string"</var>...)</code></dt> |
| <dd><a name="index-pragma-GCC-optimize"></a> |
| |
| <p>This pragma allows you to set global optimization options for functions |
| defined later in the source file. One or more strings can be |
| specified. Each function that is defined after this point is as |
| if <code>attribute((optimize("STRING")))</code> was specified for that |
| function. The parenthesis around the options is optional. |
| See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the |
| <code>optimize</code> attribute and the attribute syntax. |
| </p> |
| <p>The ‘<samp>#pragma GCC optimize</samp>’ pragma is not implemented in GCC |
| versions earlier than 4.4. |
| </p></dd> |
| </dl> |
| |
| <dl compact="compact"> |
| <dt><code>#pragma GCC push_options</code></dt> |
| <dt><code>#pragma GCC pop_options</code></dt> |
| <dd><a name="index-pragma-GCC-push_005foptions"></a> |
| <a name="index-pragma-GCC-pop_005foptions"></a> |
| |
| <p>These pragmas maintain a stack of the current target and optimization |
| options. It is intended for include files where you temporarily want |
| to switch to using a different ‘<samp>#pragma GCC target</samp>’ or |
| ‘<samp>#pragma GCC optimize</samp>’ and then to pop back to the previous |
| options. |
| </p> |
| <p>The ‘<samp>#pragma GCC push_options</samp>’ and ‘<samp>#pragma GCC pop_options</samp>’ |
| pragmas are not implemented in GCC versions earlier than 4.4. |
| </p></dd> |
| </dl> |
| |
| <dl compact="compact"> |
| <dt><code>#pragma GCC reset_options</code></dt> |
| <dd><a name="index-pragma-GCC-reset_005foptions"></a> |
| |
| <p>This pragma clears the current <code>#pragma GCC target</code> and |
| <code>#pragma GCC optimize</code> to use the default switches as specified |
| on the command line. |
| </p> |
| <p>The ‘<samp>#pragma GCC reset_options</samp>’ pragma is not implemented in GCC |
| versions earlier than 4.4. |
| </p></dd> |
| </dl> |
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| Next: <a href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" accesskey="n" rel="next">Loop-Specific Pragmas</a>, Previous: <a href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" accesskey="p" rel="prev">Push/Pop Macro 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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