<!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="Source to the Rust file `src/libcore/intrinsics.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>intrinsics.rs.html -- source</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 source"><!--[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></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"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Compiler intrinsics.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The corresponding definitions are in `librustc_codegen_llvm/intrinsic.rs`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Volatiles</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The volatile intrinsics provide operations intended to act on I/O</span>
<span class="doccomment">//! memory, which are guaranteed to not be reordered by the compiler</span>
<span class="doccomment">//! across other volatile intrinsics. See the LLVM documentation on</span>
<span class="doccomment">//! [[volatile]].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [volatile]: http://llvm.org/docs/LangRef.html#volatile-memory-accesses</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Atomics</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The atomic intrinsics provide common atomic operations on machine</span>
<span class="doccomment">//! words, with multiple possible memory orderings. They obey the same</span>
<span class="doccomment">//! semantics as C++11. See the LLVM documentation on [[atomics]].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [atomics]: http://llvm.org/docs/Atomics.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A quick refresher on memory ordering:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * Acquire - a barrier for acquiring a lock. Subsequent reads and writes</span>
<span class="doccomment">//! take place after the barrier.</span>
<span class="doccomment">//! * Release - a barrier for releasing a lock. Preceding reads and writes</span>
<span class="doccomment">//! take place before the barrier.</span>
<span class="doccomment">//! * Sequentially consistent - sequentially consistent operations are</span>
<span class="doccomment">//! guaranteed to happen in order. This is the standard mode for working</span>
<span class="doccomment">//! with atomic types and is equivalent to Java's `volatile`.</span>
<span class="attribute">#![<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_intrinsics"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"intrinsics are unlikely to ever be stabilized, instead \
they should be used through stabilized interfaces \
in the rest of the standard library"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drop_in_place"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_deprecated</span>(<span class="ident">reason</span> <span class="op">=</span> <span class="string">"no longer an intrinsic - use `ptr::drop_in_place` directly"</span>,
<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.18.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ptr</span>::<span class="ident">drop_in_place</span>;
<span class="kw">extern</span> <span class="string">"rust-intrinsic"</span> {
<span class="comment">// N.B., these intrinsics take raw pointers because they mutate aliased</span>
<span class="comment">// memory, which is not valid for either `&` or `&mut`.</span>
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_failacq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_acq_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange`][compare_exchange].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [compare_exchange]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchg_acqrel_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as both the `success` and `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_failacq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_acq_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Stores a value if the current value is the same as the `old` value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `compare_exchange_weak` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `success` and</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `failure` parameters. For example,</span>
<span class="doccomment">/// [`AtomicBool::compare_exchange_weak`][cew].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [cew]: ../../std/sync/atomic/struct.AtomicBool.html#method.compare_exchange_weak</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_cxchgweak_acqrel_failrelaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">old</span>: <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Loads the current value of the pointer.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `load` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::load`](../../std/sync/atomic/struct.AtomicBool.html#method.load).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_load</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Loads the current value of the pointer.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `load` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::load`](../../std/sync/atomic/struct.AtomicBool.html#method.load).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_load_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Loads the current value of the pointer.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `load` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::load`](../../std/sync/atomic/struct.AtomicBool.html#method.load).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_load_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_load_unordered</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Stores the value at the specified memory location.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `store` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::store`](../../std/sync/atomic/struct.AtomicBool.html#method.store).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_store</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="doccomment">/// Stores the value at the specified memory location.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `store` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::store`](../../std/sync/atomic/struct.AtomicBool.html#method.store).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_store_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="doccomment">/// Stores the value at the specified memory location.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `store` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::store`](../../std/sync/atomic/struct.AtomicBool.html#method.store).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_store_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_store_unordered</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="doccomment">/// Stores the value at the specified memory location, returning the old value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `swap` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::swap`](../../std/sync/atomic/struct.AtomicBool.html#method.swap).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xchg</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Stores the value at the specified memory location, returning the old value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `swap` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::swap`](../../std/sync/atomic/struct.AtomicBool.html#method.swap).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xchg_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Stores the value at the specified memory location, returning the old value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `swap` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::swap`](../../std/sync/atomic/struct.AtomicBool.html#method.swap).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xchg_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Stores the value at the specified memory location, returning the old value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `swap` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::swap`](../../std/sync/atomic/struct.AtomicBool.html#method.swap).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xchg_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Stores the value at the specified memory location, returning the old value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `swap` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::swap`](../../std/sync/atomic/struct.AtomicBool.html#method.swap).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xchg_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_add` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_add`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_add).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xadd</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_add` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_add`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_add).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xadd_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_add` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_add`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_add).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xadd_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_add` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_add`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_add).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xadd_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_add` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_add`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_add).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xadd_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Subtract from the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_sub` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_sub`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xsub</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Subtract from the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_sub` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_sub`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xsub_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Subtract from the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_sub` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_sub`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xsub_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Subtract from the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_sub` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_sub`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xsub_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Subtract from the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_sub` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicIsize::fetch_sub`](../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xsub_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise and with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_and` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_and`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_and).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_and</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise and with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_and` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_and`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_and).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_and_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise and with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_and` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_and`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_and).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_and_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise and with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_and` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_and`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_and).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_and_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise and with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_and` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_and`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_and).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_and_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise nand with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic::AtomicBool` type via the `fetch_nand` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_nand`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_nand).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_nand</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise nand with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic::AtomicBool` type via the `fetch_nand` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_nand`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_nand).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_nand_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise nand with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic::AtomicBool` type via the `fetch_nand` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_nand`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_nand).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_nand_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise nand with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic::AtomicBool` type via the `fetch_nand` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_nand`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_nand).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_nand_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise nand with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic::AtomicBool` type via the `fetch_nand` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_nand`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_nand).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_nand_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise or with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_or` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_or`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_or).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_or</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise or with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_or` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_or`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_or).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_or_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise or with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_or` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_or`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_or).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_or_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise or with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_or` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_or`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_or).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_or_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise or with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_or` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_or`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_or).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_or_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise xor with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_xor` method by passing</span>
<span class="doccomment">/// [`Ordering::SeqCst`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_xor`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_xor).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise xor with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_xor` method by passing</span>
<span class="doccomment">/// [`Ordering::Acquire`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_xor`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_xor).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xor_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise xor with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_xor` method by passing</span>
<span class="doccomment">/// [`Ordering::Release`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_xor`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_xor).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xor_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise xor with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_xor` method by passing</span>
<span class="doccomment">/// [`Ordering::AcqRel`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_xor`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_xor).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xor_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Bitwise xor with the current value, returning the previous value.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is available on the</span>
<span class="doccomment">/// `std::sync::atomic` types via the `fetch_xor` method by passing</span>
<span class="doccomment">/// [`Ordering::Relaxed`](../../std/sync/atomic/enum.Ordering.html)</span>
<span class="doccomment">/// as the `order`. For example,</span>
<span class="doccomment">/// [`AtomicBool::fetch_xor`](../../std/sync/atomic/struct.AtomicBool.html#method.fetch_xor).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_xor_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_max</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_max_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_max_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_max_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_max_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_min</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_min_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_min_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_min_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_min_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umin</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umin_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umin_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umin_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umin_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umax</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umax_acq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umax_rel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umax_acqrel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_umax_relaxed</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction</span>
<span class="doccomment">/// if supported; otherwise, it is a no-op.</span>
<span class="doccomment">/// Prefetches have no effect on the behavior of the program but can change its performance</span>
<span class="doccomment">/// characteristics.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `locality` argument must be a constant integer and is a temporal locality specifier</span>
<span class="doccomment">/// ranging from (0) - no locality, to (3) - extremely local keep in cache</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">prefetch_read_data</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">locality</span>: <span class="ident">i32</span>);
<span class="doccomment">/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction</span>
<span class="doccomment">/// if supported; otherwise, it is a no-op.</span>
<span class="doccomment">/// Prefetches have no effect on the behavior of the program but can change its performance</span>
<span class="doccomment">/// characteristics.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `locality` argument must be a constant integer and is a temporal locality specifier</span>
<span class="doccomment">/// ranging from (0) - no locality, to (3) - extremely local keep in cache</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">prefetch_write_data</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">locality</span>: <span class="ident">i32</span>);
<span class="doccomment">/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction</span>
<span class="doccomment">/// if supported; otherwise, it is a no-op.</span>
<span class="doccomment">/// Prefetches have no effect on the behavior of the program but can change its performance</span>
<span class="doccomment">/// characteristics.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `locality` argument must be a constant integer and is a temporal locality specifier</span>
<span class="doccomment">/// ranging from (0) - no locality, to (3) - extremely local keep in cache</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">prefetch_read_instruction</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">locality</span>: <span class="ident">i32</span>);
<span class="doccomment">/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction</span>
<span class="doccomment">/// if supported; otherwise, it is a no-op.</span>
<span class="doccomment">/// Prefetches have no effect on the behavior of the program but can change its performance</span>
<span class="doccomment">/// characteristics.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `locality` argument must be a constant integer and is a temporal locality specifier</span>
<span class="doccomment">/// ranging from (0) - no locality, to (3) - extremely local keep in cache</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">prefetch_write_instruction</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">locality</span>: <span class="ident">i32</span>);
}
<span class="kw">extern</span> <span class="string">"rust-intrinsic"</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_fence</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_fence_acq</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_fence_rel</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_fence_acqrel</span>();
<span class="doccomment">/// A compiler-only memory barrier.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Memory accesses will never be reordered across this barrier by the</span>
<span class="doccomment">/// compiler, but no instructions will be emitted for it. This is</span>
<span class="doccomment">/// appropriate for operations on the same thread that may be preempted,</span>
<span class="doccomment">/// such as when interacting with signal handlers.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_singlethreadfence</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_singlethreadfence_acq</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_singlethreadfence_rel</span>();
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">atomic_singlethreadfence_acqrel</span>();
<span class="doccomment">/// Magic intrinsic that derives its meaning from attributes</span>
<span class="doccomment">/// attached to the function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For example, dataflow uses this to inject static assertions so</span>
<span class="doccomment">/// that `rustc_peek(potentially_uninitialized)` would actually</span>
<span class="doccomment">/// double-check that dataflow did indeed compute that it is</span>
<span class="doccomment">/// uninitialized at that point in the control flow.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rustc_peek</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="kw">_</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Aborts the execution of the process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::process::abort`](../../std/process/fn.abort.html)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">abort</span>() <span class="op">-></span> <span class="op">!</span>;
<span class="doccomment">/// Tells LLVM that this point in the code is not reachable, enabling</span>
<span class="doccomment">/// further optimizations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// N.B., this is very different from the `unreachable!()` macro: Unlike the</span>
<span class="doccomment">/// macro, which panics when it is executed, it is *undefined behavior* to</span>
<span class="doccomment">/// reach code marked with this function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::hint::unreachable_unchecked`](../../std/hint/fn.unreachable_unchecked.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unreachable</span>() <span class="op">-></span> <span class="op">!</span>;
<span class="doccomment">/// Informs the optimizer that a condition is always true.</span>
<span class="doccomment">/// If the condition is false, the behavior is undefined.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// No code is generated for this intrinsic, but the optimizer will try</span>
<span class="doccomment">/// to preserve it (and its condition) between passes, which may interfere</span>
<span class="doccomment">/// with optimization of surrounding code and reduce performance. It should</span>
<span class="doccomment">/// not be used if the invariant can be discovered by the optimizer on its</span>
<span class="doccomment">/// own, or if it does not enable any significant optimizations.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">assume</span>(<span class="ident">b</span>: <span class="ident">bool</span>);
<span class="doccomment">/// Hints to the compiler that branch condition is likely to be true.</span>
<span class="doccomment">/// Returns the value passed to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Any use other than with `if` statements will probably not have an effect.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">likely</span>(<span class="ident">b</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">bool</span>;
<span class="doccomment">/// Hints to the compiler that branch condition is likely to be false.</span>
<span class="doccomment">/// Returns the value passed to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Any use other than with `if` statements will probably not have an effect.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unlikely</span>(<span class="ident">b</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">bool</span>;
<span class="doccomment">/// Executes a breakpoint trap, for inspection by a debugger.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">breakpoint</span>();
<span class="doccomment">/// The size of a type in bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// More specifically, this is the offset in bytes between successive</span>
<span class="doccomment">/// items of the same type, including alignment padding.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::mem::size_of`](../../std/mem/fn.size_of.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size_of</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">usize</span>;
<span class="doccomment">/// Moves a value to an uninitialized memory location.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Drop glue is not run on the destination.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">move_val_init</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="ident">T</span>);
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">min_align_of</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">usize</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pref_align_of</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">usize</span>;
<span class="doccomment">/// The size of the referenced value in bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::mem::size_of_val`](../../std/mem/fn.size_of_val.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size_of_val</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">usize</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">min_align_of_val</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">usize</span>;
<span class="doccomment">/// Gets a static string slice containing the name of a type.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">type_name</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>() <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>;
<span class="doccomment">/// Gets an identifier which is globally unique to the specified type. This</span>
<span class="doccomment">/// function will return the same value for a type regardless of whichever</span>
<span class="doccomment">/// crate it is invoked in.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">type_id</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span>() <span class="op">-></span> <span class="ident">u64</span>;
<span class="doccomment">/// A guard for unsafe functions that cannot ever be executed if `T` is uninhabited:</span>
<span class="doccomment">/// This will statically either panic, or do nothing.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">panic_if_uninhabited</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>();
<span class="doccomment">/// Creates a value initialized to zero.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `init` is unsafe because it returns a zeroed-out datum,</span>
<span class="doccomment">/// which is unsafe unless `T` is `Copy`. Also, even if T is</span>
<span class="doccomment">/// `Copy`, an all-zero value may not correspond to any legitimate</span>
<span class="doccomment">/// state for the type in question.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Creates an uninitialized value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `uninit` is unsafe because there is no guarantee of what its</span>
<span class="doccomment">/// contents are. In particular its drop-flag may be set to any</span>
<span class="doccomment">/// state, which means it may claim either dropped or</span>
<span class="doccomment">/// undropped. In the general case one must use `ptr::write` to</span>
<span class="doccomment">/// initialize memory previous set to the result of `uninit`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Moves a value out of scope without running drop glue.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">forget</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw">_</span>: <span class="ident">T</span>);
<span class="doccomment">/// Reinterprets the bits of a value of one type as another type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both types must have the same size. Neither the original, nor the result,</span>
<span class="doccomment">/// may be an [invalid value](../../nomicon/what-unsafe-does.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `transmute` is semantically equivalent to a bitwise move of one type</span>
<span class="doccomment">/// into another. It copies the bits from the source value into the</span>
<span class="doccomment">/// destination value, then forgets the original. It's equivalent to C's</span>
<span class="doccomment">/// `memcpy` under the hood, just like `transmute_copy`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `transmute` is **incredibly** unsafe. There are a vast number of ways to</span>
<span class="doccomment">/// cause [undefined behavior][ub] with this function. `transmute` should be</span>
<span class="doccomment">/// the absolute last resort.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [nomicon](../../nomicon/transmutes.html) has additional</span>
<span class="doccomment">/// documentation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [ub]: ../../reference/behavior-considered-undefined.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// There are a few things that `transmute` is really useful for.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Getting the bitpattern of a floating point type (or, more generally,</span>
<span class="doccomment">/// type punning, when `T` and `U` aren't pointers):</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let bitpattern = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<f32, u32>(1.0)</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// assert_eq!(bitpattern, 0x3F800000);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning a pointer into a function pointer. This is *not* portable to</span>
<span class="doccomment">/// machines where function pointers and data pointers have different sizes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// fn foo() -> i32 {</span>
<span class="doccomment">/// 0</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// let pointer = foo as *const ();</span>
<span class="doccomment">/// let function = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<*const (), fn() -> i32>(pointer)</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// assert_eq!(function(), 0);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Extending a lifetime, or shortening an invariant lifetime. This is</span>
<span class="doccomment">/// advanced, very unsafe Rust!</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// struct R<'a>(&'a i32);</span>
<span class="doccomment">/// unsafe fn extend_lifetime<'b>(r: R<'b>) -> R<'static> {</span>
<span class="doccomment">/// std::mem::transmute::<R<'b>, R<'static>>(r)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe fn shorten_invariant_lifetime<'b, 'c>(r: &'b mut R<'static>)</span>
<span class="doccomment">/// -> &'b mut R<'c> {</span>
<span class="doccomment">/// std::mem::transmute::<&'b mut R<'static>, &'b mut R<'c>>(r)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Alternatives</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Don't despair: many uses of `transmute` can be achieved through other means.</span>
<span class="doccomment">/// Below are common applications of `transmute` which can be replaced with safer</span>
<span class="doccomment">/// constructs.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning a pointer into a `usize`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ptr = &0;</span>
<span class="doccomment">/// let ptr_num_transmute = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<&i32, usize>(ptr)</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Use an `as` cast instead</span>
<span class="doccomment">/// let ptr_num_cast = ptr as *const i32 as usize;</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning a `*mut T` into an `&mut T`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ptr: *mut i32 = &mut 0;</span>
<span class="doccomment">/// let ref_transmuted = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<*mut i32, &mut i32>(ptr)</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Use a reborrow instead</span>
<span class="doccomment">/// let ref_casted = unsafe { &mut *ptr };</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning an `&mut T` into an `&mut U`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ptr = &mut 0;</span>
<span class="doccomment">/// let val_transmuted = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<&mut i32, &mut u32>(ptr)</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Now, put together `as` and reborrowing - note the chaining of `as`</span>
<span class="doccomment">/// // `as` is not transitive</span>
<span class="doccomment">/// let val_casts = unsafe { &mut *(ptr as *mut i32 as *mut u32) };</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning an `&str` into an `&[u8]`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// // this is not a good way to do this.</span>
<span class="doccomment">/// let slice = unsafe { std::mem::transmute::<&str, &[u8]>("Rust") };</span>
<span class="doccomment">/// assert_eq!(slice, &[82, 117, 115, 116]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // You could use `str::as_bytes`</span>
<span class="doccomment">/// let slice = "Rust".as_bytes();</span>
<span class="doccomment">/// assert_eq!(slice, &[82, 117, 115, 116]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Or, just use a byte string, if you have control over the string</span>
<span class="doccomment">/// // literal</span>
<span class="doccomment">/// assert_eq!(b"Rust", &[82, 117, 115, 116]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Turning a `Vec<&T>` into a `Vec<Option<&T>>`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let store = [0, 1, 2, 3];</span>
<span class="doccomment">/// let mut v_orig = store.iter().collect::<Vec<&i32>>();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Using transmute: this is Undefined Behavior, and a bad idea.</span>
<span class="doccomment">/// // However, it is no-copy.</span>
<span class="doccomment">/// let v_transmuted = unsafe {</span>
<span class="doccomment">/// std::mem::transmute::<Vec<&i32>, Vec<Option<&i32>>>(</span>
<span class="doccomment">/// v_orig.clone())</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This is the suggested, safe way.</span>
<span class="doccomment">/// // It does copy the entire vector, though, into a new array.</span>
<span class="doccomment">/// let v_collected = v_orig.clone()</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .map(|r| Some(r))</span>
<span class="doccomment">/// .collect::<Vec<Option<&i32>>>();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The no-copy, unsafe way, still using transmute, but not UB.</span>
<span class="doccomment">/// // This is equivalent to the original, but safer, and reuses the</span>
<span class="doccomment">/// // same `Vec` internals. Therefore, the new inner type must have the</span>
<span class="doccomment">/// // exact same size, and the same alignment, as the old type.</span>
<span class="doccomment">/// // The same caveats exist for this method as transmute, for</span>
<span class="doccomment">/// // the original inner type (`&i32`) to the converted inner type</span>
<span class="doccomment">/// // (`Option<&i32>`), so read the nomicon pages linked above.</span>
<span class="doccomment">/// let v_from_raw = unsafe {</span>
<span class="doccomment">/// Vec::from_raw_parts(v_orig.as_mut_ptr() as *mut Option<&i32>,</span>
<span class="doccomment">/// v_orig.len(),</span>
<span class="doccomment">/// v_orig.capacity())</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// std::mem::forget(v_orig);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `split_at_mut`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::{slice, mem};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // There are multiple ways to do this, and there are multiple problems</span>
<span class="doccomment">/// // with the following (transmute) way.</span>
<span class="doccomment">/// fn split_at_mut_transmute<T>(slice: &mut [T], mid: usize)</span>
<span class="doccomment">/// -> (&mut [T], &mut [T]) {</span>
<span class="doccomment">/// let len = slice.len();</span>
<span class="doccomment">/// assert!(mid <= len);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// let slice2 = mem::transmute::<&mut [T], &mut [T]>(slice);</span>
<span class="doccomment">/// // first: transmute is not typesafe; all it checks is that T and</span>
<span class="doccomment">/// // U are of the same size. Second, right here, you have two</span>
<span class="doccomment">/// // mutable references pointing to the same memory.</span>
<span class="doccomment">/// (&mut slice[0..mid], &mut slice2[mid..len])</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This gets rid of the typesafety problems; `&mut *` will *only* give</span>
<span class="doccomment">/// // you an `&mut T` from an `&mut T` or `*mut T`.</span>
<span class="doccomment">/// fn split_at_mut_casts<T>(slice: &mut [T], mid: usize)</span>
<span class="doccomment">/// -> (&mut [T], &mut [T]) {</span>
<span class="doccomment">/// let len = slice.len();</span>
<span class="doccomment">/// assert!(mid <= len);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// let slice2 = &mut *(slice as *mut [T]);</span>
<span class="doccomment">/// // however, you still have two mutable references pointing to</span>
<span class="doccomment">/// // the same memory.</span>
<span class="doccomment">/// (&mut slice[0..mid], &mut slice2[mid..len])</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This is how the standard library does it. This is the best method, if</span>
<span class="doccomment">/// // you need to do something like this</span>
<span class="doccomment">/// fn split_at_stdlib<T>(slice: &mut [T], mid: usize)</span>
<span class="doccomment">/// -> (&mut [T], &mut [T]) {</span>
<span class="doccomment">/// let len = slice.len();</span>
<span class="doccomment">/// assert!(mid <= len);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// let ptr = slice.as_mut_ptr();</span>
<span class="doccomment">/// // This now has three mutable references pointing at the same</span>
<span class="doccomment">/// // memory. `slice`, the rvalue ret.0, and the rvalue ret.1.</span>
<span class="doccomment">/// // `slice` is never used after `let ptr = ...`, and so one can</span>
<span class="doccomment">/// // treat it as "dead", and therefore, you only have two real</span>
<span class="doccomment">/// // mutable slices.</span>
<span class="doccomment">/// (slice::from_raw_parts_mut(ptr, mid),</span>
<span class="doccomment">/// slice::from_raw_parts_mut(ptr.add(mid), len - mid))</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">transmute</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</span><span class="op">></span>(<span class="ident">e</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">U</span>;
<span class="doccomment">/// Returns `true` if the actual type given as `T` requires drop</span>
<span class="doccomment">/// glue; returns `false` if the actual type provided for `T`</span>
<span class="doccomment">/// implements `Copy`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the actual type neither requires drop glue nor implements</span>
<span class="doccomment">/// `Copy`, then may return `true` or `false`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::mem::needs_drop`](../../std/mem/fn.needs_drop.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">needs_drop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">bool</span>;
<span class="doccomment">/// Calculates the offset from a pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is implemented as an intrinsic to avoid converting to and from an</span>
<span class="doccomment">/// integer, since the conversion would throw away aliasing information.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both the starting and resulting pointer must be either in bounds or one</span>
<span class="doccomment">/// byte past the end of an allocated object. If either pointer is out of</span>
<span class="doccomment">/// bounds or arithmetic overflow occurs then any further use of the</span>
<span class="doccomment">/// returned value will result in undefined behavior.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">offset</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">offset</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>;
<span class="doccomment">/// Calculates the offset from a pointer, potentially wrapping.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is implemented as an intrinsic to avoid converting to and from an</span>
<span class="doccomment">/// integer, since the conversion inhibits certain optimizations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike the `offset` intrinsic, this intrinsic does not restrict the</span>
<span class="doccomment">/// resulting pointer to point into or one byte past the end of an allocated</span>
<span class="doccomment">/// object, and it wraps with two's complement arithmetic. The resulting</span>
<span class="doccomment">/// value is not necessarily valid to be used to actually access memory.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">arith_offset</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">offset</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>;
<span class="doccomment">/// Equivalent to the appropriate `llvm.memcpy.p0i8.0i8.*` intrinsic, with</span>
<span class="doccomment">/// a size of `count` * `size_of::<T>()` and an alignment of</span>
<span class="doccomment">/// `min_align_of::<T>()`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The volatile parameter is set to `true`, so it will not be optimized out</span>
<span class="doccomment">/// unless size is equal to zero.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">volatile_copy_nonoverlapping_memory</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>,
<span class="ident">count</span>: <span class="ident">usize</span>);
<span class="doccomment">/// Equivalent to the appropriate `llvm.memmove.p0i8.0i8.*` intrinsic, with</span>
<span class="doccomment">/// a size of `count` * `size_of::<T>()` and an alignment of</span>
<span class="doccomment">/// `min_align_of::<T>()`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The volatile parameter is set to `true`, so it will not be optimized out</span>
<span class="doccomment">/// unless size is equal to zero.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">volatile_copy_memory</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>);
<span class="doccomment">/// Equivalent to the appropriate `llvm.memset.p0i8.*` intrinsic, with a</span>
<span class="doccomment">/// size of `count` * `size_of::<T>()` and an alignment of</span>
<span class="doccomment">/// `min_align_of::<T>()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The volatile parameter is set to `true`, so it will not be optimized out</span>
<span class="doccomment">/// unless size is equal to zero.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">volatile_set_memory</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">u8</span>, <span class="ident">count</span>: <span class="ident">usize</span>);
<span class="doccomment">/// Performs a volatile load from the `src` pointer.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::ptr::read_volatile`](../../std/ptr/fn.read_volatile.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">volatile_load</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs a volatile store to the `dst` pointer.</span>
<span class="doccomment">/// The stabilized version of this intrinsic is</span>
<span class="doccomment">/// [`std::ptr::write_volatile`](../../std/ptr/fn.write_volatile.html).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">volatile_store</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="doccomment">/// Performs a volatile load from the `src` pointer</span>
<span class="doccomment">/// The pointer is not required to be aligned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unaligned_volatile_load</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs a volatile store to the `dst` pointer.</span>
<span class="doccomment">/// The pointer is not required to be aligned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unaligned_volatile_store</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
<span class="doccomment">/// Returns the square root of an `f32`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sqrtf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the square root of an `f64`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sqrtf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Raises an `f32` to an integer power.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">powif32</span>(<span class="ident">a</span>: <span class="ident">f32</span>, <span class="ident">x</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Raises an `f64` to an integer power.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">powif64</span>(<span class="ident">a</span>: <span class="ident">f64</span>, <span class="ident">x</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the sine of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sinf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the sine of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sinf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the cosine of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cosf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the cosine of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cosf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Raises an `f32` to an `f32` power.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">powf32</span>(<span class="ident">a</span>: <span class="ident">f32</span>, <span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Raises an `f64` to an `f64` power.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">powf64</span>(<span class="ident">a</span>: <span class="ident">f64</span>, <span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the exponential of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the exponential of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns 2 raised to the power of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exp2f32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns 2 raised to the power of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exp2f64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the natural logarithm of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">logf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the natural logarithm of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">logf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the base 10 logarithm of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log10f32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the base 10 logarithm of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log10f64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the base 2 logarithm of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log2f32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the base 2 logarithm of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log2f64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns `a * b + c` for `f32` values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fmaf32</span>(<span class="ident">a</span>: <span class="ident">f32</span>, <span class="ident">b</span>: <span class="ident">f32</span>, <span class="ident">c</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns `a * b + c` for `f64` values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fmaf64</span>(<span class="ident">a</span>: <span class="ident">f64</span>, <span class="ident">b</span>: <span class="ident">f64</span>, <span class="ident">c</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the absolute value of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fabsf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the absolute value of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fabsf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Copies the sign from `y` to `x` for `f32` values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copysignf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>, <span class="ident">y</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Copies the sign from `y` to `x` for `f64` values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copysignf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>, <span class="ident">y</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the largest integer less than or equal to an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">floorf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the largest integer less than or equal to an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">floorf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the smallest integer greater than or equal to an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ceilf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the smallest integer greater than or equal to an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ceilf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the integer part of an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">truncf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the integer part of an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">truncf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the nearest integer to an `f32`. May raise an inexact floating-point exception</span>
<span class="doccomment">/// if the argument is not an integer.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rintf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the nearest integer to an `f64`. May raise an inexact floating-point exception</span>
<span class="doccomment">/// if the argument is not an integer.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rintf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the nearest integer to an `f32`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nearbyintf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the nearest integer to an `f64`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nearbyintf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Returns the nearest integer to an `f32`. Rounds half-way cases away from zero.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">roundf32</span>(<span class="ident">x</span>: <span class="ident">f32</span>) <span class="op">-></span> <span class="ident">f32</span>;
<span class="doccomment">/// Returns the nearest integer to an `f64`. Rounds half-way cases away from zero.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">roundf64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span>;
<span class="doccomment">/// Float addition that allows optimizations based on algebraic rules.</span>
<span class="doccomment">/// May assume inputs are finite.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fadd_fast</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Float subtraction that allows optimizations based on algebraic rules.</span>
<span class="doccomment">/// May assume inputs are finite.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fsub_fast</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Float multiplication that allows optimizations based on algebraic rules.</span>
<span class="doccomment">/// May assume inputs are finite.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fmul_fast</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Float division that allows optimizations based on algebraic rules.</span>
<span class="doccomment">/// May assume inputs are finite.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fdiv_fast</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Float remainder that allows optimizations based on algebraic rules.</span>
<span class="doccomment">/// May assume inputs are finite.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">frem_fast</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns the number of bits set in an integer type `T`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ctpop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns the number of leading unset bits (zeroes) in an integer type `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::ctlz;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0b0001_1100_u8;</span>
<span class="doccomment">/// let num_leading = ctlz(x);</span>
<span class="doccomment">/// assert_eq!(num_leading, 3);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An `x` with value `0` will return the bit width of `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::ctlz;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0u16;</span>
<span class="doccomment">/// let num_leading = ctlz(x);</span>
<span class="doccomment">/// assert_eq!(num_leading, 16);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ctlz</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Like `ctlz`, but extra-unsafe as it returns `undef` when</span>
<span class="doccomment">/// given an `x` with value `0`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::ctlz_nonzero;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0b0001_1100_u8;</span>
<span class="doccomment">/// let num_leading = unsafe { ctlz_nonzero(x) };</span>
<span class="doccomment">/// assert_eq!(num_leading, 3);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ctlz_nonzero</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns the number of trailing unset bits (zeroes) in an integer type `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::cttz;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0b0011_1000_u8;</span>
<span class="doccomment">/// let num_trailing = cttz(x);</span>
<span class="doccomment">/// assert_eq!(num_trailing, 3);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An `x` with value `0` will return the bit width of `T`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::cttz;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0u16;</span>
<span class="doccomment">/// let num_trailing = cttz(x);</span>
<span class="doccomment">/// assert_eq!(num_trailing, 16);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cttz</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Like `cttz`, but extra-unsafe as it returns `undef` when</span>
<span class="doccomment">/// given an `x` with value `0`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(core_intrinsics)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::intrinsics::cttz_nonzero;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x = 0b0011_1000_u8;</span>
<span class="doccomment">/// let num_trailing = unsafe { cttz_nonzero(x) };</span>
<span class="doccomment">/// assert_eq!(num_trailing, 3);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cttz_nonzero</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Reverses the bytes in an integer type `T`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bswap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Reverses the bits in an integer type `T`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bitreverse</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs checked integer addition.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `overflowing_add` method. For example,</span>
<span class="doccomment">/// [`std::u32::overflowing_add`](../../std/primitive.u32.html#method.overflowing_add)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_with_overflow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Performs checked integer subtraction</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `overflowing_sub` method. For example,</span>
<span class="doccomment">/// [`std::u32::overflowing_sub`](../../std/primitive.u32.html#method.overflowing_sub)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sub_with_overflow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Performs checked integer multiplication</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `overflowing_mul` method. For example,</span>
<span class="doccomment">/// [`std::u32::overflowing_mul`](../../std/primitive.u32.html#method.overflowing_mul)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mul_with_overflow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> (<span class="ident">T</span>, <span class="ident">bool</span>);
<span class="doccomment">/// Performs an exact division, resulting in undefined behavior where</span>
<span class="doccomment">/// `x % y != 0` or `y == 0` or `x == T::min_value() && y == -1`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exact_div</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs an unchecked division, resulting in undefined behavior</span>
<span class="doccomment">/// where y = 0 or x = `T::min_value()` and y = -1</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unchecked_div</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns the remainder of an unchecked division, resulting in</span>
<span class="doccomment">/// undefined behavior where y = 0 or x = `T::min_value()` and y = -1</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unchecked_rem</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs an unchecked left shift, resulting in undefined behavior when</span>
<span class="doccomment">/// y < 0 or y >= N, where N is the width of T in bits.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unchecked_shl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs an unchecked right shift, resulting in undefined behavior when</span>
<span class="doccomment">/// y < 0 or y >= N, where N is the width of T in bits.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unchecked_shr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs rotate left.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `rotate_left` method. For example,</span>
<span class="doccomment">/// [`std::u32::rotate_left`](../../std/primitive.u32.html#method.rotate_left)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate_left</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Performs rotate right.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `rotate_right` method. For example,</span>
<span class="doccomment">/// [`std::u32::rotate_right`](../../std/primitive.u32.html#method.rotate_right)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate_right</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns (a + b) mod 2<sup>N</sup>, where N is the width of T in bits.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `wrapping_add` method. For example,</span>
<span class="doccomment">/// [`std::u32::wrapping_add`](../../std/primitive.u32.html#method.wrapping_add)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">overflowing_add</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns (a - b) mod 2<sup>N</sup>, where N is the width of T in bits.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `wrapping_sub` method. For example,</span>
<span class="doccomment">/// [`std::u32::wrapping_sub`](../../std/primitive.u32.html#method.wrapping_sub)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">overflowing_sub</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns (a * b) mod 2<sup>N</sup>, where N is the width of T in bits.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `wrapping_mul` method. For example,</span>
<span class="doccomment">/// [`std::u32::wrapping_mul`](../../std/primitive.u32.html#method.wrapping_mul)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">overflowing_mul</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Computes `a + b`, while saturating at numeric bounds.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `saturating_add` method. For example,</span>
<span class="doccomment">/// [`std::u32::saturating_add`](../../std/primitive.u32.html#method.saturating_add)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">saturating_add</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Computes `a - b`, while saturating at numeric bounds.</span>
<span class="doccomment">/// The stabilized versions of this intrinsic are available on the integer</span>
<span class="doccomment">/// primitives via the `saturating_sub` method. For example,</span>
<span class="doccomment">/// [`std::u32::saturating_sub`](../../std/primitive.u32.html#method.saturating_sub)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">saturating_sub</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">T</span>, <span class="ident">b</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="doccomment">/// Returns the value of the discriminant for the variant in 'v',</span>
<span class="doccomment">/// cast to a `u64`; if `T` has no discriminant, returns 0.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">discriminant_value</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">v</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">u64</span>;
<span class="doccomment">/// Rust's "try catch" construct which invokes the function pointer `f` with</span>
<span class="doccomment">/// the data pointer `data`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The third pointer is a target-specific data pointer which is filled in</span>
<span class="doccomment">/// with the specifics of the exception that occurred. For examples on Unix</span>
<span class="doccomment">/// platforms this is a `*mut *mut T` which is filled in by the compiler and</span>
<span class="doccomment">/// on MSVC it's `*mut [usize; 2]`. For more information see the compiler's</span>
<span class="doccomment">/// source as well as std's catch implementation.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try</span>(<span class="ident">f</span>: <span class="kw">fn</span>(<span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>), <span class="ident">data</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">local_ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">i32</span>;
<span class="doccomment">/// Emits a `!nontemporal` store according to LLVM (see their docs).</span>
<span class="doccomment">/// Probably will never become stable.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nontemporal_store</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>);
}
<span class="kw">mod</span> <span class="ident">real_intrinsics</span> {
<span class="kw">extern</span> <span class="string">"rust-intrinsic"</span> {
<span class="doccomment">/// Copies `count * size_of::<T>()` bytes from `src` to `dst`. The source</span>
<span class="doccomment">/// and destination must *not* overlap.</span>
<span class="doccomment">/// For the full docs, see the stabilized wrapper [`copy_nonoverlapping`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`copy_nonoverlapping`]: ../../std/ptr/fn.copy_nonoverlapping.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copy_nonoverlapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>);
<span class="doccomment">/// Copies `count * size_of::<T>()` bytes from `src` to `dst`. The source</span>
<span class="doccomment">/// and destination may overlap.</span>
<span class="doccomment">/// For the full docs, see the stabilized wrapper [`copy`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`copy`]: ../../std/ptr/fn.copy.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copy</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>);
<span class="doccomment">/// Sets `count * size_of::<T>()` bytes of memory starting at `dst` to</span>
<span class="doccomment">/// `val`.</span>
<span class="doccomment">/// For the full docs, see the stabilized wrapper [`write_bytes`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`write_bytes`]: ../../std/ptr/fn.write_bytes.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write_bytes</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">u8</span>, <span class="ident">count</span>: <span class="ident">usize</span>);
}
}
<span class="doccomment">/// Copies `count * size_of::<T>()` bytes from `src` to `dst`. The source</span>
<span class="doccomment">/// and destination must *not* overlap.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For regions of memory which might overlap, use [`copy`] instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `copy_nonoverlapping` is semantically equivalent to C's [`memcpy`], but</span>
<span class="doccomment">/// with the argument order swapped.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`copy`]: ./fn.copy.html</span>
<span class="doccomment">/// [`memcpy`]: https://en.cppreference.com/w/c/string/byte/memcpy</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if any of the following conditions are violated:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `src` must be [valid] for reads of `count * size_of::<T>()` bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `dst` must be [valid] for writes of `count * size_of::<T>()` bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Both `src` and `dst` must be properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The region of memory beginning at `src` with a size of `count *</span>
<span class="doccomment">/// size_of::<T>()` bytes must *not* overlap with the region of memory</span>
<span class="doccomment">/// beginning at `dst` with the same size.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`read`], `copy_nonoverlapping` creates a bitwise copy of `T`, regardless of</span>
<span class="doccomment">/// whether `T` is [`Copy`]. If `T` is not [`Copy`], using *both* the values</span>
<span class="doccomment">/// in the region beginning at `*src` and the region beginning at `*dst` can</span>
<span class="doccomment">/// [violate memory safety][read-ownership].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that even if the effectively copied size (`count * size_of::<T>()`) is</span>
<span class="doccomment">/// `0`, the pointers must be non-NULL and properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Copy`]: ../marker/trait.Copy.html</span>
<span class="doccomment">/// [`read`]: ../ptr/fn.read.html</span>
<span class="doccomment">/// [read-ownership]: ../ptr/fn.read.html#ownership-of-the-returned-value</span>
<span class="doccomment">/// [valid]: ../ptr/index.html#safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Manually implement [`Vec::append`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// /// Moves all the elements of `src` into `dst`, leaving `src` empty.</span>
<span class="doccomment">/// fn append<T>(dst: &mut Vec<T>, src: &mut Vec<T>) {</span>
<span class="doccomment">/// let src_len = src.len();</span>
<span class="doccomment">/// let dst_len = dst.len();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Ensure that `dst` has enough capacity to hold all of `src`.</span>
<span class="doccomment">/// dst.reserve(src_len);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// // The call to offset is always safe because `Vec` will never</span>
<span class="doccomment">/// // allocate more than `isize::MAX` bytes.</span>
<span class="doccomment">/// let dst_ptr = dst.as_mut_ptr().offset(dst_len as isize);</span>
<span class="doccomment">/// let src_ptr = src.as_ptr();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Truncate `src` without dropping its contents. We do this first,</span>
<span class="doccomment">/// // to avoid problems in case something further down panics.</span>
<span class="doccomment">/// src.set_len(0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The two regions cannot overlap because mutable references do</span>
<span class="doccomment">/// // not alias, and two different vectors cannot own the same</span>
<span class="doccomment">/// // memory.</span>
<span class="doccomment">/// ptr::copy_nonoverlapping(src_ptr, dst_ptr, src_len);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Notify `dst` that it now holds the contents of `src`.</span>
<span class="doccomment">/// dst.set_len(dst_len + src_len);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut a = vec!['r'];</span>
<span class="doccomment">/// let mut b = vec!['u', 's', 't'];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// append(&mut a, &mut b);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(a, &['r', 'u', 's', 't']);</span>
<span class="doccomment">/// assert!(b.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Vec::append`]: ../../std/vec/struct.Vec.html#method.append</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">copy_nonoverlapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>) {
<span class="ident">real_intrinsics</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">src</span>, <span class="ident">dst</span>, <span class="ident">count</span>);
}
<span class="doccomment">/// Copies `count * size_of::<T>()` bytes from `src` to `dst`. The source</span>
<span class="doccomment">/// and destination may overlap.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the source and destination will *never* overlap,</span>
<span class="doccomment">/// [`copy_nonoverlapping`] can be used instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `copy` is semantically equivalent to C's [`memmove`], but with the argument</span>
<span class="doccomment">/// order swapped. Copying takes place as if the bytes were copied from `src`</span>
<span class="doccomment">/// to a temporary array and then copied from the array to `dst`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`copy_nonoverlapping`]: ./fn.copy_nonoverlapping.html</span>
<span class="doccomment">/// [`memmove`]: https://en.cppreference.com/w/c/string/byte/memmove</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if any of the following conditions are violated:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `src` must be [valid] for reads of `count * size_of::<T>()` bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `dst` must be [valid] for writes of `count * size_of::<T>()` bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Both `src` and `dst` must be properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`read`], `copy` creates a bitwise copy of `T`, regardless of</span>
<span class="doccomment">/// whether `T` is [`Copy`]. If `T` is not [`Copy`], using both the values</span>
<span class="doccomment">/// in the region beginning at `*src` and the region beginning at `*dst` can</span>
<span class="doccomment">/// [violate memory safety][read-ownership].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that even if the effectively copied size (`count * size_of::<T>()`) is</span>
<span class="doccomment">/// `0`, the pointers must be non-NULL and properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Copy`]: ../marker/trait.Copy.html</span>
<span class="doccomment">/// [`read`]: ../ptr/fn.read.html</span>
<span class="doccomment">/// [read-ownership]: ../ptr/fn.read.html#ownership-of-the-returned-value</span>
<span class="doccomment">/// [valid]: ../ptr/index.html#safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Efficiently create a Rust vector from an unsafe buffer:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # #[allow(dead_code)]</span>
<span class="doccomment">/// unsafe fn from_buf_raw<T>(ptr: *const T, elts: usize) -> Vec<T> {</span>
<span class="doccomment">/// let mut dst = Vec::with_capacity(elts);</span>
<span class="doccomment">/// dst.set_len(elts);</span>
<span class="doccomment">/// ptr::copy(ptr, dst.as_mut_ptr(), elts);</span>
<span class="doccomment">/// dst</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">copy</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>) {
<span class="ident">real_intrinsics</span>::<span class="ident">copy</span>(<span class="ident">src</span>, <span class="ident">dst</span>, <span class="ident">count</span>)
}
<span class="doccomment">/// Sets `count * size_of::<T>()` bytes of memory starting at `dst` to</span>
<span class="doccomment">/// `val`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `write_bytes` is similar to C's [`memset`], but sets `count *</span>
<span class="doccomment">/// size_of::<T>()` bytes to `val`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`memset`]: https://en.cppreference.com/w/c/string/byte/memset</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if any of the following conditions are violated:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `dst` must be [valid] for writes of `count * size_of::<T>()` bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `dst` must be properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Additionally, the caller must ensure that writing `count *</span>
<span class="doccomment">/// size_of::<T>()` bytes to the given region of memory results in a valid</span>
<span class="doccomment">/// value of `T`. Using a region of memory typed as a `T` that contains an</span>
<span class="doccomment">/// invalid value of `T` is undefined behavior.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that even if the effectively copied size (`count * size_of::<T>()`) is</span>
<span class="doccomment">/// `0`, the pointer must be non-NULL and properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [valid]: ../ptr/index.html#safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec![0u32; 4];</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// let vec_ptr = vec.as_mut_ptr();</span>
<span class="doccomment">/// ptr::write_bytes(vec_ptr, 0xfe, 2);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(vec, [0xfefefefe, 0xfefefefe, 0, 0]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Creating an invalid value:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut v = Box::new(0i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// // Leaks the previously held value by overwriting the `Box<T>` with</span>
<span class="doccomment">/// // a null pointer.</span>
<span class="doccomment">/// ptr::write_bytes(&mut v as *mut Box<i32>, 0, 1);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // At this point, using or dropping `v` results in undefined behavior.</span>
<span class="doccomment">/// // drop(v); // ERROR</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Even leaking `v` "uses" it, and hence is undefined behavior.</span>
<span class="doccomment">/// // mem::forget(v); // ERROR</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // In fact, `v` is invalid according to basic type layout invariants, so *any*</span>
<span class="doccomment">/// // operation touching it is undefined behavior.</span>
<span class="doccomment">/// // let v2 = v; // ERROR</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// // Let us instead put in a valid value</span>
<span class="doccomment">/// ptr::write(&mut v as *mut Box<i32>, Box::new(42i32));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Now the box is fine</span>
<span class="doccomment">/// assert_eq!(*v, 42);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">write_bytes</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">u8</span>, <span class="ident">count</span>: <span class="ident">usize</span>) {
<span class="ident">real_intrinsics</span>::<span class="ident">write_bytes</span>(<span class="ident">dst</span>, <span class="ident">val</span>, <span class="ident">count</span>)
}
</pre></div>
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