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87 lines
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87 lines
4.1 KiB
HTML
4 years ago
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<title>picoChip Built-in Functions - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Target-Builtins.html#Target-Builtins" title="Target Builtins">
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<link rel="prev" href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" title="NDS32 Built-in Functions">
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<link rel="next" href="PowerPC-Built_002din-Functions.html#PowerPC-Built_002din-Functions" title="PowerPC Built-in Functions">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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</head>
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<body>
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<div class="node">
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<a name="picoChip-Built-in-Functions"></a>
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<a name="picoChip-Built_002din-Functions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="PowerPC-Built_002din-Functions.html#PowerPC-Built_002din-Functions">PowerPC Built-in Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions">NDS32 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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<hr>
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</div>
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<h4 class="subsection">6.58.18 picoChip Built-in Functions</h4>
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<p>GCC provides an interface to selected machine instructions from the
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picoChip instruction set.
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<dl>
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<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>
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that have the same value as the sign bit. The result is the number of
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leading sign bits minus one, giving the number of redundant sign bits in
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<var>value</var>.
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<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
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<var>value</var>.
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<br><dt><code>int __builtin_brev (int </code><var>value</var><code>)</code><dd>Bit reversal. Return the result of reversing the bits in
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<var>value</var>. Bit 15 is swapped with bit 0, bit 14 is swapped with bit 1,
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and so on.
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<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>,
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storing the value 32767 if the result overflows.
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<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
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<var>x</var>, storing the value −32768 if the result overflows.
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<br><dt><code>void __builtin_halt (void)</code><dd>Halt. The processor stops execution. This built-in is useful for
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implementing assertions.
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</dl>
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</body></html>
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