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<h4 class="subsection">6.58.22 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:
<div class="defun">
— 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>
<blockquote><p>Generates the <code>brk</code> machine instruction.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>clrpsw</code> machine instruction to clear the specified
bit in the processor status word.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>int</code> machine instruction to generate an interrupt
with the specified value.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><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></blockquote></div>
<div class="defun">
— 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>
<blockquote><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></blockquote></div>
<div class="defun">
— 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>
<blockquote><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></blockquote></div>
<div class="defun">
— 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>
<blockquote><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></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvfachi</code> machine instruction to read the top
32 bits of the accumulator.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvfacmi</code> machine instruction to read the middle
32 bits of the accumulator.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvfc</code> machine instruction which reads the control
register specified in its argument and returns its value.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvtachi</code> machine instruction to set the top
32 bits of the accumulator.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvtaclo</code> machine instruction to set the bottom
32 bits of the accumulator.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvtc</code> machine instruction which sets control
register number <code>reg</code> to <code>val</code>.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>mvtipl</code> machine instruction set the interrupt
priority level.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>racw</code> machine instruction to round the accumulator
according to the specified mode.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>revw</code> machine instruction which swaps the bytes in
the argument so that bits 0–7 now occupy bits 8–15 and vice versa,
and also bits 16–23 occupy bits 24–31 and vice versa.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>rmpa</code> machine instruction which initiates a
repeated multiply and accumulate sequence.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><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></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>sat</code> machine instruction which returns the
saturated value of the argument.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>setpsw</code> machine instruction to set the specified
bit in the processor status word.
</p></blockquote></div>
<div class="defun">
— 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>
<blockquote><p>Generates the <code>wait</code> machine instruction.
</p></blockquote></div>
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