You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
5.2 KiB
HTML
123 lines
5.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
|
(see below). A copy of the license is included in the section entitled
|
|
"GNU Free Documentation License".
|
|
|
|
(a) The FSF's Front-Cover Text is:
|
|
|
|
A GNU Manual
|
|
|
|
(b) The FSF's Back-Cover Text is:
|
|
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
|
software. Copies published by the Free Software Foundation raise
|
|
funds for GNU development. -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>picoChip Built-in Functions (Using the GNU Compiler Collection (GCC))</title>
|
|
|
|
<meta name="description" content="picoChip Built-in Functions (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="keywords" content="picoChip Built-in Functions (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Target-Builtins.html#Target-Builtins" rel="up" title="Target Builtins">
|
|
<link href="PowerPC-Built_002din-Functions.html#PowerPC-Built_002din-Functions" rel="next" title="PowerPC Built-in Functions">
|
|
<link href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" rel="prev" title="NDS32 Built-in Functions">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="picoChip-Built_002din-Functions"></a>
|
|
<div class="header">
|
|
<p>
|
|
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>
|
|
</div>
|
|
<hr>
|
|
<a name="picoChip-Built_002din-Functions-1"></a>
|
|
<h4 class="subsection">6.59.20 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>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|