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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libstd/../stdsimd/stdsimd/arch/detect/os/linux/arm.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>arm.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../../../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../../light.css" id="themeStyle"><script src="../../../../../../../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></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">&#9776;</div><a href='../../../../../../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../../../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../../../../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../../../../../../../settings.html"><img src="../../../../../../../../../wheel.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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<span class="doccomment">//! Run-time feature detection for ARM on Linux.</span>

<span class="kw">use</span> <span class="ident">arch</span>::<span class="ident">detect</span>::<span class="ident">Feature</span>;
<span class="kw">use</span> <span class="ident">arch</span>::<span class="ident">detect</span>::<span class="ident">cache</span>;
<span class="kw">use</span> <span class="ident">arch</span>::<span class="ident">detect</span>::<span class="ident">bit</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">auxvec</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">cpuinfo</span>;

<span class="doccomment">/// Performs run-time feature detection.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_for</span>(<span class="ident">x</span>: <span class="ident">Feature</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="ident">cache</span>::<span class="ident">test</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">detect_features</span>)
}

<span class="doccomment">/// Try to read the features from the auxiliary vector, and if that fails, try</span>
<span class="doccomment">/// to read them from /proc/cpuinfo.</span>
<span class="kw">fn</span> <span class="ident">detect_features</span>() <span class="op">-&gt;</span> <span class="ident">cache</span>::<span class="ident">Initializer</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">cache</span>::<span class="ident">Initializer</span>::<span class="ident">default</span>();
    <span class="kw">let</span> <span class="ident">enable_feature</span> <span class="op">=</span> <span class="op">|</span><span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cache</span>::<span class="ident">Initializer</span>, <span class="ident">f</span>, <span class="ident">enable</span><span class="op">|</span> {
        <span class="kw">if</span> <span class="ident">enable</span> {
            <span class="ident">value</span>.<span class="ident">set</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="ident">u32</span>);
        }
    };

    <span class="comment">// The values are part of the platform-specific [asm/hwcap.h][hwcap]</span>
    <span class="comment">//</span>
    <span class="comment">// [hwcap]: https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h</span>
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">auxv</span>) <span class="op">=</span> <span class="ident">auxvec</span>::<span class="ident">auxv</span>() {
        <span class="ident">enable_feature</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">value</span>, <span class="ident">Feature</span>::<span class="ident">neon</span>, <span class="ident">bit</span>::<span class="ident">test</span>(<span class="ident">auxv</span>.<span class="ident">hwcap</span>, <span class="number">12</span>));
        <span class="ident">enable_feature</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">value</span>, <span class="ident">Feature</span>::<span class="ident">pmull</span>, <span class="ident">bit</span>::<span class="ident">test</span>(<span class="ident">auxv</span>.<span class="ident">hwcap2</span>, <span class="number">1</span>));
        <span class="kw">return</span> <span class="ident">value</span>;
    }

    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="ident">cpuinfo</span>::<span class="ident">CpuInfo</span>::<span class="ident">new</span>() {
        <span class="ident">enable_feature</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">value</span>, <span class="ident">Feature</span>::<span class="ident">neon</span>, <span class="ident">c</span>.<span class="ident">field</span>(<span class="string">&quot;Features&quot;</span>).<span class="ident">has</span>(<span class="string">&quot;neon&quot;</span>) <span class="op">&amp;&amp;</span>
            <span class="op">!</span><span class="ident">has_broken_neon</span>(<span class="kw-2">&amp;</span><span class="ident">c</span>));
        <span class="ident">enable_feature</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">value</span>, <span class="ident">Feature</span>::<span class="ident">pmull</span>, <span class="ident">c</span>.<span class="ident">field</span>(<span class="string">&quot;Features&quot;</span>).<span class="ident">has</span>(<span class="string">&quot;pmull&quot;</span>));
        <span class="kw">return</span> <span class="ident">value</span>;
    }
    <span class="ident">value</span>
}

<span class="doccomment">/// Is the CPU known to have a broken NEON unit?</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See https://crbug.com/341598.</span>
<span class="kw">fn</span> <span class="ident">has_broken_neon</span>(<span class="ident">cpuinfo</span>: <span class="kw-2">&amp;</span><span class="ident">cpuinfo</span>::<span class="ident">CpuInfo</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="ident">cpuinfo</span>.<span class="ident">field</span>(<span class="string">&quot;CPU implementer&quot;</span>) <span class="op">==</span> <span class="string">&quot;0x51&quot;</span>
        <span class="op">&amp;&amp;</span> <span class="ident">cpuinfo</span>.<span class="ident">field</span>(<span class="string">&quot;CPU architecture&quot;</span>) <span class="op">==</span> <span class="string">&quot;7&quot;</span>
        <span class="op">&amp;&amp;</span> <span class="ident">cpuinfo</span>.<span class="ident">field</span>(<span class="string">&quot;CPU variant&quot;</span>) <span class="op">==</span> <span class="string">&quot;0x1&quot;</span>
        <span class="op">&amp;&amp;</span> <span class="ident">cpuinfo</span>.<span class="ident">field</span>(<span class="string">&quot;CPU part&quot;</span>) <span class="op">==</span> <span class="string">&quot;0x04d&quot;</span>
        <span class="op">&amp;&amp;</span> <span class="ident">cpuinfo</span>.<span class="ident">field</span>(<span class="string">&quot;CPU revision&quot;</span>) <span class="op">==</span> <span class="string">&quot;0&quot;</span>
}
</pre>
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