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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="This module defines 256-bit vector implementations of `memchr` and friends."><title>memchr::arch::x86_64::avx2::memchr - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../../../" data-static-root-path="../../../../../static.files/" data-current-crate="memchr" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../../../memchr/index.html">memchr</a><span class="version">2.7.4</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module memchr</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In memchr::<wbr>arch::<wbr>x86_<wbr>64::<wbr>avx2</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../../../index.html">memchr</a>::<wbr><a href="../../../index.html">arch</a>::<wbr><a href="../../index.html">x86_64</a>::<wbr><a href="../index.html">avx2</a></span><h1>Module <span>memchr</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../../../src/memchr/arch/x86_64/avx2/memchr.rs.html#1-1352">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This module defines 256-bit vector implementations of <code>memchr</code> and friends.</p>
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<p>The main types in this module are <a href="struct.One.html" title="struct memchr::arch::x86_64::avx2::memchr::One"><code>One</code></a>, <a href="struct.Two.html" title="struct memchr::arch::x86_64::avx2::memchr::Two"><code>Two</code></a> and <a href="struct.Three.html" title="struct memchr::arch::x86_64::avx2::memchr::Three"><code>Three</code></a>. They are for
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searching for one, two or three distinct bytes, respectively, in a haystack.
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Each type also has corresponding double ended iterators. These searchers are
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typically much faster than scalar routines accomplishing the same task.</p>
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<p>The <code>One</code> searcher also provides a <a href="struct.One.html#method.count" title="method memchr::arch::x86_64::avx2::memchr::One::count"><code>One::count</code></a> routine for efficiently
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counting the number of times a single byte occurs in a haystack. This is
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useful, for example, for counting the number of lines in a haystack. This
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routine exists because it is usually faster, especially with a high match
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count, then using <a href="struct.One.html#method.find" title="method memchr::arch::x86_64::avx2::memchr::One::find"><code>One::find</code></a> repeatedly. (<a href="struct.OneIter.html" title="struct memchr::arch::x86_64::avx2::memchr::OneIter"><code>OneIter</code></a> specializes its
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<code>Iterator::count</code> implementation to use this routine.)</p>
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<p>Only one, two and three bytes are supported because three bytes is about
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the point where one sees diminishing returns. Beyond this point and it’s
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probably (but not necessarily) better to just use a simple <code>[bool; 256]</code> array
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or similar. However, it depends mightily on the specific work-load and the
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expected match frequency.</p>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.One.html" title="struct memchr::arch::x86_64::avx2::memchr::One">One</a></div><div class="desc docblock-short">Finds all occurrences of a single byte in a haystack.</div></li><li><div class="item-name"><a class="struct" href="struct.OneIter.html" title="struct memchr::arch::x86_64::avx2::memchr::OneIter">OneIter</a></div><div class="desc docblock-short">An iterator over all occurrences of a single byte in a haystack.</div></li><li><div class="item-name"><a class="struct" href="struct.Three.html" title="struct memchr::arch::x86_64::avx2::memchr::Three">Three</a></div><div class="desc docblock-short">Finds all occurrences of three bytes in a haystack.</div></li><li><div class="item-name"><a class="struct" href="struct.ThreeIter.html" title="struct memchr::arch::x86_64::avx2::memchr::ThreeIter">Three<wbr>Iter</a></div><div class="desc docblock-short">An iterator over all occurrences of three possible bytes in a haystack.</div></li><li><div class="item-name"><a class="struct" href="struct.Two.html" title="struct memchr::arch::x86_64::avx2::memchr::Two">Two</a></div><div class="desc docblock-short">Finds all occurrences of two bytes in a haystack.</div></li><li><div class="item-name"><a class="struct" href="struct.TwoIter.html" title="struct memchr::arch::x86_64::avx2::memchr::TwoIter">TwoIter</a></div><div class="desc docblock-short">An iterator over all occurrences of two possible bytes in a haystack.</div></li></ul></section></div></main></body></html> |