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- <a name="S_002f390-Function-Attributes"></a>
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- Next: <a href="SH-Function-Attributes.html#SH-Function-Attributes" accesskey="n" rel="next">SH Function Attributes</a>, Previous: <a href="RX-Function-Attributes.html#RX-Function-Attributes" accesskey="p" rel="prev">RX Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</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="S_002f390-Function-Attributes-1"></a>
- <h4 class="subsection">6.33.30 S/390 Function Attributes</h4>
-
- <p>These function attributes are supported on the S/390:
- </p>
- <dl compact="compact">
- <dt><code>hotpatch (<var>halfwords-before-function-label</var>,<var>halfwords-after-function-label</var>)</code></dt>
- <dd><a name="index-hotpatch-function-attribute_002c-S_002f390"></a>
-
- <p>On S/390 System z targets, you can use this function attribute to
- make GCC generate a “hot-patching” function prologue. If the
- <samp>-mhotpatch=</samp> command-line option is used at the same time,
- the <code>hotpatch</code> attribute takes precedence. The first of the
- two arguments specifies the number of halfwords to be added before
- the function label. A second argument can be used to specify the
- number of halfwords to be added after the function label. For
- both arguments the maximum allowed value is 1000000.
- </p>
- <p>If both arguments are zero, hotpatching is disabled.
- </p>
- </dd>
- <dt><code>target (<var>options</var>)</code></dt>
- <dd><a name="index-target-function-attribute-4"></a>
- <p>As discussed in <a href="Common-Function-Attributes.html#Common-Function-Attributes">Common Function Attributes</a>, this attribute
- allows specification of target-specific compilation options.
- </p>
- <p>On S/390, the following options are supported:
- </p>
- <dl compact="compact">
- <dt>‘<samp>arch=</samp>’</dt>
- <dt>‘<samp>tune=</samp>’</dt>
- <dt>‘<samp>stack-guard=</samp>’</dt>
- <dt>‘<samp>stack-size=</samp>’</dt>
- <dt>‘<samp>branch-cost=</samp>’</dt>
- <dt>‘<samp>warn-framesize=</samp>’</dt>
- <dt>‘<samp>backchain</samp>’</dt>
- <dt>‘<samp>no-backchain</samp>’</dt>
- <dt>‘<samp>hard-dfp</samp>’</dt>
- <dt>‘<samp>no-hard-dfp</samp>’</dt>
- <dt>‘<samp>hard-float</samp>’</dt>
- <dt>‘<samp>soft-float</samp>’</dt>
- <dt>‘<samp>htm</samp>’</dt>
- <dt>‘<samp>no-htm</samp>’</dt>
- <dt>‘<samp>vx</samp>’</dt>
- <dt>‘<samp>no-vx</samp>’</dt>
- <dt>‘<samp>packed-stack</samp>’</dt>
- <dt>‘<samp>no-packed-stack</samp>’</dt>
- <dt>‘<samp>small-exec</samp>’</dt>
- <dt>‘<samp>no-small-exec</samp>’</dt>
- <dt>‘<samp>mvcle</samp>’</dt>
- <dt>‘<samp>no-mvcle</samp>’</dt>
- <dt>‘<samp>warn-dynamicstack</samp>’</dt>
- <dt>‘<samp>no-warn-dynamicstack</samp>’</dt>
- </dl>
-
- <p>The options work exactly like the S/390 specific command line
- options (without the prefix <samp>-m</samp>) except that they do not
- change any feature macros. For example,
- </p>
- <div class="smallexample">
- <pre class="smallexample"><code>target("no-vx")</code>
- </pre></div>
-
- <p>does not undefine the <code>__VEC__</code> macro.
- </p></dd>
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