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| <h4 class="subsection">6.52.10 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> |
| which 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 will stop execution. This built-in is useful for |
| implementing assertions. |
| |
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