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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/poly_005fint.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gccint/poly_005fint.html b/share/doc/gccint/poly_005fint.html new file mode 100644 index 0000000..bfdba80 --- /dev/null +++ b/share/doc/gccint/poly_005fint.html @@ -0,0 +1,141 @@ +<!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: poly_int</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: poly_int"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: poly_int"> +<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="Overview-of-poly_005fint.html#Overview-of-poly_005fint" rel="next" title="Overview of poly_int"> +<link href="Dump-examples.html#Dump-examples" rel="previous" title="Dump examples"> +<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="poly_005fint"></a> +<div class="header"> +<p> +Next: <a href="GENERIC.html#GENERIC" accesskey="n" rel="next">GENERIC</a>, Previous: <a href="Passes.html#Passes" accesskey="p" rel="previous">Passes</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="Sizes-and-offsets-as-runtime-invariants"></a> +<h2 class="chapter">10 Sizes and offsets as runtime invariants</h2> +<a name="index-polynomial-integers"></a> +<a name="index-poly_005fint"></a> + +<p>GCC allows the size of a hardware register to be a runtime invariant +rather than a compile-time constant. This in turn means that various +sizes and offsets must also be runtime invariants rather than +compile-time constants, such as: +</p> +<ul> +<li> the size of a general <code>machine_mode</code> (see <a href="Machine-Modes.html#Machine-Modes">Machine Modes</a>); + +</li><li> the size of a spill slot; + +</li><li> the offset of something within a stack frame; + +</li><li> the number of elements in a vector; + +</li><li> the size and offset of a <code>mem</code> rtx (see <a href="Regs-and-Memory.html#Regs-and-Memory">Regs and Memory</a>); and + +</li><li> the byte offset in a <code>subreg</code> rtx (see <a href="Regs-and-Memory.html#Regs-and-Memory">Regs and Memory</a>). +</li></ul> + +<p>The motivating example is the Arm SVE ISA, whose vector registers can be +any multiple of 128 bits between 128 and 2048 inclusive. The compiler +normally produces code that works for all SVE register sizes, with the +actual size only being known at runtime. +</p> +<p>GCC’s main representation of such runtime invariants is the +<code>poly_int</code> class. This chapter describes what <code>poly_int</code> +does, lists the available operations, and gives some general +usage guidelines. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Overview-of-poly_005fint.html#Overview-of-poly_005fint" accesskey="1">Overview of <code>poly_int</code></a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Consequences-of-using-poly_005fint.html#Consequences-of-using-poly_005fint" accesskey="2">Consequences of using <code>poly_int</code></a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Comparisons-involving-poly_005fint.html#Comparisons-involving-poly_005fint" accesskey="3">Comparisons involving <code>poly_int</code></a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Arithmetic-on-poly_005fints.html#Arithmetic-on-poly_005fints" accesskey="4">Arithmetic on <code>poly_int</code>s</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Alignment-of-poly_005fints.html#Alignment-of-poly_005fints" accesskey="5">Alignment of <code>poly_int</code>s</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Computing-bounds-on-poly_005fints.html#Computing-bounds-on-poly_005fints" accesskey="6">Computing bounds on <code>poly_int</code>s</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Converting-poly_005fints.html#Converting-poly_005fints" accesskey="7">Converting <code>poly_int</code>s</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Miscellaneous-poly_005fint-routines.html#Miscellaneous-poly_005fint-routines" accesskey="8">Miscellaneous <code>poly_int</code> routines</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Guidelines-for-using-poly_005fint.html#Guidelines-for-using-poly_005fint" accesskey="9">Guidelines for using <code>poly_int</code></a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="GENERIC.html#GENERIC" accesskey="n" rel="next">GENERIC</a>, Previous: <a href="Passes.html#Passes" accesskey="p" rel="previous">Passes</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> |