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diff --git a/share/doc/gcc/Integers-implementation.html b/share/doc/gcc/Integers-implementation.html new file mode 100644 index 0000000..4845406 --- /dev/null +++ b/share/doc/gcc/Integers-implementation.html @@ -0,0 +1,137 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +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>Using the GNU Compiler Collection (GCC): Integers implementation</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Integers implementation"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Integers implementation"> +<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="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="C-Implementation.html#C-Implementation" rel="up" title="C Implementation"> +<link href="Floating-point-implementation.html#Floating-point-implementation" rel="next" title="Floating point implementation"> +<link href="Characters-implementation.html#Characters-implementation" rel="previous" title="Characters implementation"> +<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_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Integers-implementation"></a> +<div class="header"> +<p> +Next: <a href="Floating-point-implementation.html#Floating-point-implementation" accesskey="n" rel="next">Floating point implementation</a>, Previous: <a href="Characters-implementation.html#Characters-implementation" accesskey="p" rel="previous">Characters implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Integers"></a> +<h3 class="section">4.5 Integers</h3> + +<ul> +<li> <cite>Any extended integer types that exist in the implementation (C99 +and C11 6.2.5).</cite> + +<p>GCC does not support any extended integer types. +</p> +</li><li> <cite>Whether signed integer types are represented using sign and magnitude, +two’s complement, or one’s complement, and whether the extraordinary value +is a trap representation or an ordinary value (C99 and C11 6.2.6.2).</cite> + +<p>GCC supports only two’s complement integer types, and all bit patterns +are ordinary values. +</p> +</li><li> <cite>The rank of any extended integer type relative to another extended +integer type with the same precision (C99 and C11 6.3.1.1).</cite> + +<p>GCC does not support any extended integer types. +</p> +</li><li> <cite>The result of, or the signal raised by, converting an integer to a +signed integer type when the value cannot be represented in an object of +that type (C90 6.2.1.2, C99 and C11 6.3.1.3).</cite> + +<p>For conversion to a type of width <em>N</em>, the value is reduced +modulo <em>2^N</em> to be within range of the type; no signal is raised. +</p> +</li><li> <cite>The results of some bitwise operations on signed integers (C90 +6.3, C99 and C11 6.5).</cite> + +<p>Bitwise operators act on the representation of the value including +both the sign and value bits, where the sign bit is considered +immediately above the highest-value value bit. Signed ‘<samp>>></samp>’ acts +on negative numbers by sign extension. +</p> +<p>As an extension to the C language, GCC does not use the latitude given in +C99 and C11 only to treat certain aspects of signed ‘<samp><<</samp>’ as undefined. +However, <samp>-fsanitize=shift</samp> (and <samp>-fsanitize=undefined</samp>) will +diagnose such cases. They are also diagnosed where constant +expressions are required. +</p> +</li><li> <cite>The sign of the remainder on integer division (C90 6.3.5).</cite> + +<p>GCC always follows the C99 and C11 requirement that the result of division is +truncated towards zero. +</p> +</li></ul> + +<hr> +<div class="header"> +<p> +Next: <a href="Floating-point-implementation.html#Floating-point-implementation" accesskey="n" rel="next">Floating point implementation</a>, Previous: <a href="Characters-implementation.html#Characters-implementation" accesskey="p" rel="previous">Characters implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |