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<a name="picoChip-Built_002din-Functions-1"></a>
<h4 class="subsection">6.60.21 picoChip Built-in Functions</h4>

<p>GCC provides an interface to selected machine instructions from the
picoChip instruction set.
</p>
<dl compact="compact">
<dt><code>int __builtin_sbc (int <var>value</var>)</code></dt>
<dd><p>Sign bit count.  Return the number of consecutive bits in <var>value</var>
that have the same value as the sign bit.  The result is the number of
leading sign bits minus one, giving the number of redundant sign bits in
<var>value</var>.
</p>
</dd>
<dt><code>int __builtin_byteswap (int <var>value</var>)</code></dt>
<dd><p>Byte swap.  Return the result of swapping the upper and lower bytes of
<var>value</var>.
</p>
</dd>
<dt><code>int __builtin_brev (int <var>value</var>)</code></dt>
<dd><p>Bit reversal.  Return the result of reversing the bits in
<var>value</var>.  Bit 15 is swapped with bit 0, bit 14 is swapped with bit 1,
and so on.
</p>
</dd>
<dt><code>int __builtin_adds (int <var>x</var>, int <var>y</var>)</code></dt>
<dd><p>Saturating addition.  Return the result of adding <var>x</var> and <var>y</var>,
storing the value 32767 if the result overflows.
</p>
</dd>
<dt><code>int __builtin_subs (int <var>x</var>, int <var>y</var>)</code></dt>
<dd><p>Saturating subtraction.  Return the result of subtracting <var>y</var> from
<var>x</var>, storing the value -32768 if the result overflows.
</p>
</dd>
<dt><code>void __builtin_halt (void)</code></dt>
<dd><p>Halt.  The processor stops execution.  This built-in is useful for
implementing assertions.
</p>
</dd>
</dl>


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