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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Libgcc.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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| -rw-r--r-- | share/doc/gccint/Libgcc.html | 134 |
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diff --git a/share/doc/gccint/Libgcc.html b/share/doc/gccint/Libgcc.html new file mode 100644 index 0000000..97ec8f4 --- /dev/null +++ b/share/doc/gccint/Libgcc.html @@ -0,0 +1,134 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>GNU Compiler Collection (GCC) Internals: Libgcc</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Libgcc"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Libgcc"> +<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="index.html#Top" rel="up" title="Top"> +<link href="Integer-library-routines.html#Integer-library-routines" rel="next" title="Integer library routines"> +<link href="Interface.html#Interface" rel="previous" title="Interface"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Libgcc"></a> +<div class="header"> +<p> +Next: <a href="Languages.html#Languages" accesskey="n" rel="next">Languages</a>, Previous: <a href="Interface.html#Interface" accesskey="p" rel="previous">Interface</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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="The-GCC-low_002dlevel-runtime-library"></a> +<h2 class="chapter">4 The GCC low-level runtime library</h2> + +<p>GCC provides a low-level runtime library, <samp>libgcc.a</samp> or +<samp>libgcc_s.so.1</samp> on some platforms. GCC generates calls to +routines in this library automatically, whenever it needs to perform +some operation that is too complicated to emit inline code for. +</p> +<p>Most of the routines in <code>libgcc</code> handle arithmetic operations +that the target processor cannot perform directly. This includes +integer multiply and divide on some machines, and all floating-point +and fixed-point operations on other machines. <code>libgcc</code> also includes +routines for exception handling, and a handful of miscellaneous operations. +</p> +<p>Some of these routines can be defined in mostly machine-independent C. +Others must be hand-written in assembly language for each processor +that needs them. +</p> +<p>GCC will also generate calls to C library routines, such as +<code>memcpy</code> and <code>memset</code>, in some cases. The set of routines +that GCC may possibly use is documented in <a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other-Builtins">Other +Builtins</a> in <cite>Using the GNU Compiler Collection (GCC)</cite>. +</p> +<p>These routines take arguments and return values of a specific machine +mode, not a specific C type. See <a href="Machine-Modes.html#Machine-Modes">Machine Modes</a>, for an explanation +of this concept. For illustrative purposes, in this chapter the +floating point type <code>float</code> is assumed to correspond to <code>SFmode</code>; +<code>double</code> to <code>DFmode</code>; and <code>long double<!-- /@w --></code> to both +<code>TFmode</code> and <code>XFmode</code>. Similarly, the integer types <code>int</code> +and <code>unsigned int<!-- /@w --></code> correspond to <code>SImode</code>; <code>long</code> and +<code>unsigned long<!-- /@w --></code> to <code>DImode</code>; and <code>long long<!-- /@w --></code> and +<code>unsigned long long<!-- /@w --></code> to <code>TImode</code>. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Integer-library-routines.html#Integer-library-routines" accesskey="1">Integer library routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Soft-float-library-routines.html#Soft-float-library-routines" accesskey="2">Soft float library routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Decimal-float-library-routines.html#Decimal-float-library-routines" accesskey="3">Decimal float library routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Fixed_002dpoint-fractional-library-routines.html#Fixed_002dpoint-fractional-library-routines" accesskey="4">Fixed-point fractional library routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Exception-handling-routines.html#Exception-handling-routines" accesskey="5">Exception handling routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Miscellaneous-routines.html#Miscellaneous-routines" accesskey="6">Miscellaneous routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="Languages.html#Languages" accesskey="n" rel="next">Languages</a>, Previous: <a href="Interface.html#Interface" accesskey="p" rel="previous">Interface</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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> + + + +</body> +</html> |