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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/Conditional-Expressions.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/gccint/Conditional-Expressions.html')
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1 files changed, 107 insertions, 0 deletions
diff --git a/share/doc/gccint/Conditional-Expressions.html b/share/doc/gccint/Conditional-Expressions.html new file mode 100644 index 0000000..1d9342d --- /dev/null +++ b/share/doc/gccint/Conditional-Expressions.html @@ -0,0 +1,107 @@ +<!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: Conditional Expressions</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Conditional Expressions"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Conditional Expressions"> +<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="Operands.html#Operands" rel="up" title="Operands"> +<link href="Logical-Operators.html#Logical-Operators" rel="next" title="Logical Operators"> +<link href="Compound-Lvalues.html#Compound-Lvalues" rel="previous" title="Compound Lvalues"> +<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="Conditional-Expressions"></a> +<div class="header"> +<p> +Next: <a href="Logical-Operators.html#Logical-Operators" accesskey="n" rel="next">Logical Operators</a>, Previous: <a href="Compound-Lvalues.html#Compound-Lvalues" accesskey="p" rel="previous">Compound Lvalues</a>, Up: <a href="Operands.html#Operands" accesskey="u" rel="up">Operands</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="Conditional-Expressions-1"></a> +<h4 class="subsection">12.6.3 Conditional Expressions</h4> +<a name="index-Conditional-Expressions"></a> + +<p>A C <code>?:</code> expression is converted into an <code>if</code> statement with +each branch assigning to the same temporary. So, +</p> +<div class="smallexample"> +<pre class="smallexample">a = b ? c : d; +</pre></div> +<p>becomes +</p><div class="smallexample"> +<pre class="smallexample">if (b == 1) + T1 = c; +else + T1 = d; +a = T1; +</pre></div> + +<p>The GIMPLE level if-conversion pass re-introduces <code>?:</code> +expression, if appropriate. It is used to vectorize loops with +conditions using vector conditional operations. +</p> +<p>Note that in GIMPLE, <code>if</code> statements are represented using +<code>GIMPLE_COND</code>, as described below. +</p> + + + +</body> +</html> |