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<h4 class="subsection">6.58.18 picoChip Built-in Functions</h4>
<p>GCC provides an interface to selected machine instructions from the
picoChip instruction set.
<dl>
<dt><code>int __builtin_sbc (int </code><var>value</var><code>)</code><dd>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>.
<br><dt><code>int __builtin_byteswap (int </code><var>value</var><code>)</code><dd>Byte swap. Return the result of swapping the upper and lower bytes of
<var>value</var>.
<br><dt><code>int __builtin_brev (int </code><var>value</var><code>)</code><dd>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.
<br><dt><code>int __builtin_adds (int </code><var>x</var><code>, int </code><var>y</var><code>)</code><dd>Saturating addition. Return the result of adding <var>x</var> and <var>y</var>,
storing the value 32767 if the result overflows.
<br><dt><code>int __builtin_subs (int </code><var>x</var><code>, int </code><var>y</var><code>)</code><dd>Saturating subtraction. Return the result of subtracting <var>y</var> from
<var>x</var>, storing the value −32768 if the result overflows.
<br><dt><code>void __builtin_halt (void)</code><dd>Halt. The processor stops execution. This built-in is useful for
implementing assertions.
</dl>
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