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<title>Using the GNU Compiler Collection (GCC): RX Built-in Functions</title>
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<a name="RX-Built_002din-Functions"></a>
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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-Hardware-Transactional-Memory-Built_002din-Functions.html#PowerPC-Hardware-Transactional-Memory-Built_002din-Functions" accesskey="p" rel="prev">PowerPC Hardware Transactional Memory Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</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="RX-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.23 RX Built-in Functions</h4>
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<p>GCC supports some of the RX instructions which cannot be expressed in
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the C programming language via the use of built-in functions. The
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following functions are supported:
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</p>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fbrk"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_brk</strong> <em>(void)</em></dt>
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<dd><p>Generates the <code>brk</code> machine instruction.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fclrpsw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_clrpsw</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>clrpsw</code> machine instruction to clear the specified
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bit in the processor status word.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fint"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_int</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>int</code> machine instruction to generate an interrupt
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with the specified value.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates the <code>machi</code> machine instruction to add the result of
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multiplying the top 16 bits of the two arguments into the
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accumulator.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates the <code>maclo</code> machine instruction to add the result of
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multiplying the bottom 16 bits of the two arguments into the
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accumulator.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates the <code>mulhi</code> machine instruction to place the result of
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multiplying the top 16 bits of the two arguments into the
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accumulator.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates the <code>mullo</code> machine instruction to place the result of
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multiplying the bottom 16 bits of the two arguments into the
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accumulator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfachi"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfachi</strong> <em>(void)</em></dt>
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<dd><p>Generates the <code>mvfachi</code> machine instruction to read the top
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32 bits of the accumulator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfacmi"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfacmi</strong> <em>(void)</em></dt>
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<dd><p>Generates the <code>mvfacmi</code> machine instruction to read the middle
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32 bits of the accumulator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvfc"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_mvfc</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>mvfc</code> machine instruction which reads the control
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register specified in its argument and returns its value.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtachi"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtachi</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>mvtachi</code> machine instruction to set the top
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32 bits of the accumulator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtaclo"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtaclo</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>mvtaclo</code> machine instruction to set the bottom
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32 bits of the accumulator.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates the <code>mvtc</code> machine instruction which sets control
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register number <code>reg</code> to <code>val</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fmvtipl"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_mvtipl</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>mvtipl</code> machine instruction set the interrupt
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priority level.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fracw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_racw</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>racw</code> machine instruction to round the accumulator
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according to the specified mode.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005frevw"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_revw</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>revw</code> machine instruction which swaps the bytes in
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the argument so that bits 0–7 now occupy bits 8–15 and vice versa,
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and also bits 16–23 occupy bits 24–31 and vice versa.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005frmpa"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_rmpa</strong> <em>(void)</em></dt>
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<dd><p>Generates the <code>rmpa</code> machine instruction which initiates a
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repeated multiply and accumulate sequence.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fround"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_round</strong> <em>(float)</em></dt>
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<dd><p>Generates the <code>round</code> machine instruction which returns the
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floating-point argument rounded according to the current rounding mode
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set in the floating-point status word register.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fsat"></a>Built-in Function: <em>int</em> <strong>__builtin_rx_sat</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>sat</code> machine instruction which returns the
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saturated value of the argument.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fsetpsw"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_setpsw</strong> <em>(int)</em></dt>
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<dd><p>Generates the <code>setpsw</code> machine instruction to set the specified
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bit in the processor status word.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005frx_005fwait"></a>Built-in Function: <em>void</em> <strong>__builtin_rx_wait</strong> <em>(void)</em></dt>
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<dd><p>Generates the <code>wait</code> machine instruction.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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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-Hardware-Transactional-Memory-Built_002din-Functions.html#PowerPC-Hardware-Transactional-Memory-Built_002din-Functions" accesskey="p" rel="prev">PowerPC Hardware Transactional Memory Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</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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