124 lines
5.2 KiB
HTML
124 lines
5.2 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2016 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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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): picoChip Built-in Functions</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): picoChip Built-in Functions">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): picoChip Built-in Functions">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Target-Builtins.html#Target-Builtins" rel="up" title="Target Builtins">
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<link href="PowerPC-Built_002din-Functions.html#PowerPC-Built_002din-Functions" rel="next" title="PowerPC Built-in Functions">
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<link href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" rel="prev" title="NDS32 Built-in Functions">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="picoChip-Built_002din-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="PowerPC-Built_002din-Functions.html#PowerPC-Built_002din-Functions" accesskey="n" rel="next">PowerPC Built-in Functions</a>, Previous: <a href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" accesskey="p" rel="prev">NDS32 Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="picoChip-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.19 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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</p>
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<dl compact="compact">
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<dt><code>int __builtin_sbc (int <var>value</var>)</code></dt>
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<dd><p>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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</p>
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</dd>
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<dt><code>int __builtin_byteswap (int <var>value</var>)</code></dt>
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<dd><p>Byte swap. Return the result of swapping the upper and lower bytes of
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<var>value</var>.
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</p>
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</dd>
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<dt><code>int __builtin_brev (int <var>value</var>)</code></dt>
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<dd><p>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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</p>
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</dd>
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<dt><code>int __builtin_adds (int <var>x</var>, int <var>y</var>)</code></dt>
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<dd><p>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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</p>
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</dd>
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<dt><code>int __builtin_subs (int <var>x</var>, int <var>y</var>)</code></dt>
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<dd><p>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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</p>
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</dd>
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<dt><code>void __builtin_halt (void)</code></dt>
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<dd><p>Halt. The processor stops execution. This built-in is useful for
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implementing assertions.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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