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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/Subst-Iterators.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gccint/Subst-Iterators.html b/share/doc/gccint/Subst-Iterators.html new file mode 100644 index 0000000..1293191 --- /dev/null +++ b/share/doc/gccint/Subst-Iterators.html @@ -0,0 +1,128 @@ +<!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: Subst Iterators</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Subst Iterators"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Subst Iterators"> +<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="Iterators.html#Iterators" rel="up" title="Iterators"> +<link href="Parameterized-Names.html#Parameterized-Names" rel="next" title="Parameterized Names"> +<link href="Int-Iterators.html#Int-Iterators" rel="previous" title="Int Iterators"> +<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="Subst-Iterators"></a> +<div class="header"> +<p> +Next: <a href="Parameterized-Names.html#Parameterized-Names" accesskey="n" rel="next">Parameterized Names</a>, Previous: <a href="Int-Iterators.html#Int-Iterators" accesskey="p" rel="previous">Int Iterators</a>, Up: <a href="Iterators.html#Iterators" accesskey="u" rel="up">Iterators</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="Subst-Iterators-1"></a> +<h4 class="subsection">17.23.4 Subst Iterators</h4> +<a name="index-subst-iterators-in-_002emd-files"></a> +<a name="index-define_005fsubst-5"></a> +<a name="index-define_005fsubst_005fattr"></a> + +<p>Subst iterators are special type of iterators with the following +restrictions: they could not be declared explicitly, they always have +only two values, and they do not have explicit dedicated name. +Subst-iterators are triggered only when corresponding subst-attribute is +used in RTL-pattern. +</p> +<p>Subst iterators transform templates in the following way: the templates +are duplicated, the subst-attributes in these templates are replaced +with the corresponding values, and a new attribute is implicitly added +to the given <code>define_insn</code>/<code>define_expand</code>. The name of the +added attribute matches the name of <code>define_subst</code>. Such +attributes are declared implicitly, and it is not allowed to have a +<code>define_attr</code> named as a <code>define_subst</code>. +</p> +<p>Each subst iterator is linked to a <code>define_subst</code>. It is declared +implicitly by the first appearance of the corresponding +<code>define_subst_attr</code>, and it is not allowed to define it explicitly. +</p> +<p>Declarations of subst-attributes have the following syntax: +</p> +<a name="index-define_005fsubst_005fattr-1"></a> +<div class="smallexample"> +<pre class="smallexample">(define_subst_attr "<var>name</var>" + "<var>subst-name</var>" + "<var>no-subst-value</var>" + "<var>subst-applied-value</var>") +</pre></div> + +<p><var>name</var> is a string with which the given subst-attribute could be +referred to. +</p> +<p><var>subst-name</var> shows which <code>define_subst</code> should be applied to an +RTL-template if the given subst-attribute is present in the +RTL-template. +</p> +<p><var>no-subst-value</var> is a value with which subst-attribute would be +replaced in the first copy of the original RTL-template. +</p> +<p><var>subst-applied-value</var> is a value with which subst-attribute would be +replaced in the second copy of the original RTL-template. +</p> + + + +</body> +</html> |