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diff --git a/share/doc/gccint/RTL-SSA.html b/share/doc/gccint/RTL-SSA.html new file mode 100644 index 0000000..cf317d9 --- /dev/null +++ b/share/doc/gccint/RTL-SSA.html @@ -0,0 +1,122 @@ +<!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: RTL SSA</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: RTL SSA"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: RTL SSA"> +<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="RTL.html#RTL" rel="up" title="RTL"> +<link href="Using-RTL-SSA.html#Using-RTL-SSA" rel="next" title="Using RTL SSA"> +<link href="Calls.html#Calls" rel="previous" title="Calls"> +<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="RTL-SSA"></a> +<div class="header"> +<p> +Next: <a href="Sharing.html#Sharing" accesskey="n" rel="next">Sharing</a>, Previous: <a href="Calls.html#Calls" accesskey="p" rel="previous">Calls</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</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="On_002dthe_002dSide-SSA-Form-for-RTL"></a> +<h3 class="section">14.21 On-the-Side SSA Form for RTL</h3> +<a name="index-SSA_002c-RTL-form"></a> +<a name="index-RTL-SSA"></a> + +<p>The patterns of an individual RTL instruction describe which registers +are inputs to that instruction and which registers are outputs from +that instruction. However, it is often useful to know where the +definition of a register input comes from and where the result of +a register output is used. One way of obtaining this information +is to use the RTL SSA form, which provides a Static Single Assignment +representation of the RTL instructions. +</p> +<p>The RTL SSA code is located in the <samp>rtl-ssa</samp> subdirectory of the GCC +source tree. This section only gives a brief overview of it; please +see the comments in the source code for more details. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Using-RTL-SSA.html#Using-RTL-SSA" accesskey="1">Using RTL SSA</a>:</td><td> </td><td align="left" valign="top">What a pass needs to do to use the RTL SSA form +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Instructions.html#RTL-SSA-Instructions" accesskey="2">RTL SSA Instructions</a>:</td><td> </td><td align="left" valign="top">How instructions are represented and organized +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Basic-Blocks.html#RTL-SSA-Basic-Blocks" accesskey="3">RTL SSA Basic Blocks</a>:</td><td> </td><td align="left" valign="top">How instructions are grouped into blocks +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Resources.html#RTL-SSA-Resources" accesskey="4">RTL SSA Resources</a>:</td><td> </td><td align="left" valign="top">How registers and memory are represented +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Accesses.html#RTL-SSA-Accesses" accesskey="5">RTL SSA Accesses</a>:</td><td> </td><td align="left" valign="top">How register and memory accesses are represented +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Phi-Nodes.html#RTL-SSA-Phi-Nodes" accesskey="6">RTL SSA Phi Nodes</a>:</td><td> </td><td align="left" valign="top">How multiple sources are combined into one +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-SSA-Access-Lists.html#RTL-SSA-Access-Lists" accesskey="7">RTL SSA Access Lists</a>:</td><td> </td><td align="left" valign="top">How accesses are chained together +</td></tr> +<tr><td align="left" valign="top">• <a href="Changing-RTL-Instructions.html#Changing-RTL-Instructions" accesskey="8">Changing RTL Instructions</a>:</td><td> </td><td align="left" valign="top">How to use the RTL SSA framework to change insns +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="Sharing.html#Sharing" accesskey="n" rel="next">Sharing</a>, Previous: <a href="Calls.html#Calls" accesskey="p" rel="previous">Calls</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</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> |