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<a name="RX-Built-in-Functions"></a>
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Next: <a rel="next" accesskey="n" href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions">S/390 System z Built-in Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="PowerPC-Hardware-Transactional-Memory-Built_002din-Functions.html#PowerPC-Hardware-Transactional-Memory-Built_002din-Functions">PowerPC Hardware Transactional Memory Built-in Functions</a>,
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Up: <a rel="up" accesskey="u" href="Target-Builtins.html#Target-Builtins">Target Builtins</a>
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<h4 class="subsection">6.58.22 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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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_brk</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fbrk-4109"></a></var><br>
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<blockquote><p>Generates the <code>brk</code> machine instruction.
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</p></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_clrpsw</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fclrpsw-4110"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_int</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fint-4111"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_machi</b> (<var>int, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmachi-4112"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_maclo</b> (<var>int, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmaclo-4113"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mulhi</b> (<var>int, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmulhi-4114"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mullo</b> (<var>int, int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmullo-4115"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: int <b>__builtin_rx_mvfachi</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvfachi-4116"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: int <b>__builtin_rx_mvfacmi</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvfacmi-4117"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: int <b>__builtin_rx_mvfc</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvfc-4118"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mvtachi</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvtachi-4119"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mvtaclo</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvtaclo-4120"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mvtc</b> (<var>int reg, int val</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvtc-4121"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_mvtipl</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fmvtipl-4122"></a></var><br>
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<blockquote><p>Generates the <code>mvtipl</code> machine instruction set the interrupt
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priority level.
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</p></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_racw</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fracw-4123"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: int <b>__builtin_rx_revw</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005frevw-4124"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_rmpa</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005frmpa-4125"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_round</b> (<var>float</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fround-4126"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: int <b>__builtin_rx_sat</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fsat-4127"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_setpsw</b> (<var>int</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fsetpsw-4128"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_rx_wait</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005frx_005fwait-4129"></a></var><br>
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<blockquote><p>Generates the <code>wait</code> machine instruction.
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</p></blockquote></div>
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