<!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="API documentation for the Rust `__isb` fn in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, __isb"><title>core::arch::aarch64::__isb - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../light1.35.0.css" id="themeStyle"><script src="../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../core/index.html'><img src='../../../rust-logo1.35.0.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../../index.html'>core</a>::<wbr><a href='../index.html'>arch</a>::<wbr><a href='index.html'>aarch64</a></p><script>window.sidebarCurrent = {name: '__isb', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/core/up/stdsimd/crates/core_arch/src/acle/barrier/mod.rs.html#118-123' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../../index.html'>core</a>::<wbr><a href='../index.html'>arch</a>::<wbr><a href='index.html'>aarch64</a>::<wbr><a class="fn" href=''>__isb</a></span></h1><pre class='rust fn'>pub unsafe fn __isb<A>(arg: A) <span class="where fmt-newline">where<br> A: Isb, </span></pre><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>stdsimd</code> <a href="https://github.com/rust-lang/rust/issues/48556">#48556</a>)</div><div class='stab portability'>This is supported on <strong>AArch64</strong> only.</div></div><div class='docblock'><p>Generates an ISB (instruction synchronization barrier) instruction or equivalent CP15
instruction.</p>
<p>This instruction flushes the processor pipeline fetch buffers, so that following instructions
are fetched from cache or memory.</p>
<p>An ISB is needed after some system maintenance operations. An ISB is also needed before
transferring control to code that has been loaded or modified in memory, for example by an
overlay mechanism or just-in-time code generator. (Note that if instruction and data caches are
separate, privileged cache maintenance operations would be needed in order to unify the caches.)</p>
<p>The only supported argument for the __isb() intrinsic is 15, corresponding to the SY (full
system) scope of the ISB instruction.</p>
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