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<a name="RX-Built_002din-Functions"></a>
<div class="header">
<p>
Next: <a href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions" accesskey="n" rel="next">S/390 System z Built-in Functions</a>, Previous: <a href="PowerPC-Matrix_002dMultiply-Assist-Built_002din-Functions.html#PowerPC-Matrix_002dMultiply-Assist-Built_002din-Functions" accesskey="p" rel="prev">PowerPC Matrix-Multiply Assist Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<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>
</div>
<hr>
<a name="RX-Built_002din-Functions-1"></a>
<h4 class="subsection">6.60.27 RX Built-in Functions</h4>
<p>GCC supports some of the RX instructions which cannot be expressed in
the C programming language via the use of built-in functions.  The
following functions are supported:
</p>
<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fbrk"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_brk</strong> <em>(void)</em></dt>
<dd><p>Generates the <code>brk</code> machine instruction.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fclrpsw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_clrpsw</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>clrpsw</code> machine instruction to clear the specified
bit in the processor status word.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fint"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_int</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>int</code> machine instruction to generate an interrupt
with the specified value.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmachi"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_machi</strong> <em>(int, int)</em></dt>
<dd><p>Generates the <code>machi</code> machine instruction to add the result of
multiplying the top 16 bits of the two arguments into the
accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmaclo"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_maclo</strong> <em>(int, int)</em></dt>
<dd><p>Generates the <code>maclo</code> machine instruction to add the result of
multiplying the bottom 16 bits of the two arguments into the
accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmulhi"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mulhi</strong> <em>(int, int)</em></dt>
<dd><p>Generates the <code>mulhi</code> machine instruction to place the result of
multiplying the top 16 bits of the two arguments into the
accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmullo"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mullo</strong> <em>(int, int)</em></dt>
<dd><p>Generates the <code>mullo</code> machine instruction to place the result of
multiplying the bottom 16 bits of the two arguments into the
accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfachi"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfachi</strong> <em>(void)</em></dt>
<dd><p>Generates the <code>mvfachi</code> machine instruction to read the top
32 bits of the accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfacmi"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfacmi</strong> <em>(void)</em></dt>
<dd><p>Generates the <code>mvfacmi</code> machine instruction to read the middle
32 bits of the accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfc"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfc</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>mvfc</code> machine instruction which reads the control
register specified in its argument and returns its value.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtachi"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtachi</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>mvtachi</code> machine instruction to set the top
32 bits of the accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtaclo"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtaclo</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>mvtaclo</code> machine instruction to set the bottom
32 bits of the accumulator.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtc"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtc</strong> <em>(int reg, int val)</em></dt>
<dd><p>Generates the <code>mvtc</code> machine instruction which sets control
register number <code>reg</code> to <code>val</code>.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtipl"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtipl</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>mvtipl</code> machine instruction set the interrupt
priority level.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fracw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_racw</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>racw</code> machine instruction to round the accumulator
according to the specified mode.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005frevw"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_revw</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>revw</code> machine instruction which swaps the bytes in
the argument so that bits 0&ndash;7 now occupy bits 8&ndash;15 and vice versa,
and also bits 16&ndash;23 occupy bits 24&ndash;31 and vice versa.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005frmpa"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_rmpa</strong> <em>(void)</em></dt>
<dd><p>Generates the <code>rmpa</code> machine instruction which initiates a
repeated multiply and accumulate sequence.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fround"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_round</strong> <em>(float)</em></dt>
<dd><p>Generates the <code>round</code> machine instruction which returns the
floating-point argument rounded according to the current rounding mode
set in the floating-point status word register.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fsat"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_sat</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>sat</code> machine instruction which returns the
saturated value of the argument.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fsetpsw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_setpsw</strong> <em>(int)</em></dt>
<dd><p>Generates the <code>setpsw</code> machine instruction to set the specified
bit in the processor status word.
</p></dd></dl>

<dl>
<dt><a name="index-_005f_005fbuiltin_005frx_005fwait"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_wait</strong> <em>(void)</em></dt>
<dd><p>Generates the <code>wait</code> machine instruction.
</p></dd></dl>

<hr>
<div class="header">
<p>
Next: <a href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions" accesskey="n" rel="next">S/390 System z Built-in Functions</a>, Previous: <a href="PowerPC-Matrix_002dMultiply-Assist-Built_002din-Functions.html#PowerPC-Matrix_002dMultiply-Assist-Built_002din-Functions" accesskey="p" rel="prev">PowerPC Matrix-Multiply Assist Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<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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