| <!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 `crates/core_arch/src/x86/cpuid.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cpuid.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><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.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_arch/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></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"><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="../../../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> |
| <span id="2"> 2</span> |
| <span id="3"> 3</span> |
| <span id="4"> 4</span> |
| <span id="5"> 5</span> |
| <span id="6"> 6</span> |
| <span id="7"> 7</span> |
| <span id="8"> 8</span> |
| <span id="9"> 9</span> |
| <span id="10"> 10</span> |
| <span id="11"> 11</span> |
| <span id="12"> 12</span> |
| <span id="13"> 13</span> |
| <span id="14"> 14</span> |
| <span id="15"> 15</span> |
| <span id="16"> 16</span> |
| <span id="17"> 17</span> |
| <span id="18"> 18</span> |
| <span id="19"> 19</span> |
| <span id="20"> 20</span> |
| <span id="21"> 21</span> |
| <span id="22"> 22</span> |
| <span id="23"> 23</span> |
| <span id="24"> 24</span> |
| <span id="25"> 25</span> |
| <span id="26"> 26</span> |
| <span id="27"> 27</span> |
| <span id="28"> 28</span> |
| <span id="29"> 29</span> |
| <span id="30"> 30</span> |
| <span id="31"> 31</span> |
| <span id="32"> 32</span> |
| <span id="33"> 33</span> |
| <span id="34"> 34</span> |
| <span id="35"> 35</span> |
| <span id="36"> 36</span> |
| <span id="37"> 37</span> |
| <span id="38"> 38</span> |
| <span id="39"> 39</span> |
| <span id="40"> 40</span> |
| <span id="41"> 41</span> |
| <span id="42"> 42</span> |
| <span id="43"> 43</span> |
| <span id="44"> 44</span> |
| <span id="45"> 45</span> |
| <span id="46"> 46</span> |
| <span id="47"> 47</span> |
| <span id="48"> 48</span> |
| <span id="49"> 49</span> |
| <span id="50"> 50</span> |
| <span id="51"> 51</span> |
| <span id="52"> 52</span> |
| <span id="53"> 53</span> |
| <span id="54"> 54</span> |
| <span id="55"> 55</span> |
| <span id="56"> 56</span> |
| <span id="57"> 57</span> |
| <span id="58"> 58</span> |
| <span id="59"> 59</span> |
| <span id="60"> 60</span> |
| <span id="61"> 61</span> |
| <span id="62"> 62</span> |
| <span id="63"> 63</span> |
| <span id="64"> 64</span> |
| <span id="65"> 65</span> |
| <span id="66"> 66</span> |
| <span id="67"> 67</span> |
| <span id="68"> 68</span> |
| <span id="69"> 69</span> |
| <span id="70"> 70</span> |
| <span id="71"> 71</span> |
| <span id="72"> 72</span> |
| <span id="73"> 73</span> |
| <span id="74"> 74</span> |
| <span id="75"> 75</span> |
| <span id="76"> 76</span> |
| <span id="77"> 77</span> |
| <span id="78"> 78</span> |
| <span id="79"> 79</span> |
| <span id="80"> 80</span> |
| <span id="81"> 81</span> |
| <span id="82"> 82</span> |
| <span id="83"> 83</span> |
| <span id="84"> 84</span> |
| <span id="85"> 85</span> |
| <span id="86"> 86</span> |
| <span id="87"> 87</span> |
| <span id="88"> 88</span> |
| <span id="89"> 89</span> |
| <span id="90"> 90</span> |
| <span id="91"> 91</span> |
| <span id="92"> 92</span> |
| <span id="93"> 93</span> |
| <span id="94"> 94</span> |
| <span id="95"> 95</span> |
| <span id="96"> 96</span> |
| <span id="97"> 97</span> |
| <span id="98"> 98</span> |
| <span id="99"> 99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| </pre><div class="example-wrap"><pre class="rust "> |
| <span class="doccomment">//! `cpuid` intrinsics</span> |
| <span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">module_name_repetitions</span>)]</span> |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">use</span> <span class="ident">stdarch_test</span>::<span class="ident">assert_instr</span>; |
| |
| <span class="doccomment">/// Result of the `cpuid` instruction.</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">missing_inline_in_public_items</span>)]</span> |
| <span class="comment">// ^^ the derived impl of Debug for CpuidResult is not #[inline] and that's OK.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Ord</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>)]</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CpuidResult</span> { |
| <span class="doccomment">/// EAX register.</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="ident">eax</span>: <span class="ident">u32</span>, |
| <span class="doccomment">/// EBX register.</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="ident">ebx</span>: <span class="ident">u32</span>, |
| <span class="doccomment">/// ECX register.</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="ident">ecx</span>: <span class="ident">u32</span>, |
| <span class="doccomment">/// EDX register.</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="ident">edx</span>: <span class="ident">u32</span>, |
| } |
| |
| <span class="doccomment">/// Returns the result of the `cpuid` instruction for a given `leaf` (`EAX`)</span> |
| <span class="doccomment">/// and</span> |
| <span class="doccomment">/// `sub_leaf` (`ECX`).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The highest-supported leaf value is returned by the first tuple argument of</span> |
| <span class="doccomment">/// [`__get_cpuid_max(0)`](fn.__get_cpuid_max.html). For leaves containung</span> |
| <span class="doccomment">/// sub-leaves, the second tuple argument returns the highest-supported</span> |
| <span class="doccomment">/// sub-leaf</span> |
| <span class="doccomment">/// value.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The [CPUID Wikipedia page][wiki_cpuid] contains how to query which</span> |
| <span class="doccomment">/// information using the `EAX` and `ECX` registers, and the interpretation of</span> |
| <span class="doccomment">/// the results returned in `EAX`, `EBX`, `ECX`, and `EDX`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The references are:</span> |
| <span class="doccomment">/// - [Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2:</span> |
| <span class="doccomment">/// Instruction Set Reference, A-Z][intel64_ref].</span> |
| <span class="doccomment">/// - [AMD64 Architecture Programmer's Manual, Volume 3: General-Purpose and</span> |
| <span class="doccomment">/// System Instructions][amd64_ref].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [wiki_cpuid]: https://en.wikipedia.org/wiki/CPUID</span> |
| <span class="doccomment">/// [intel64_ref]: http://www.intel.de/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf</span> |
| <span class="doccomment">/// [amd64_ref]: http://support.amd.com/TechDocs/24594.pdf</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="ident">cpuid</span>))]</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">__cpuid_count</span>(<span class="ident">leaf</span>: <span class="ident">u32</span>, <span class="ident">sub_leaf</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">CpuidResult</span> { |
| <span class="kw">let</span> <span class="ident">eax</span>; |
| <span class="kw">let</span> <span class="ident">ebx</span>; |
| <span class="kw">let</span> <span class="ident">ecx</span>; |
| <span class="kw">let</span> <span class="ident">edx</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>)]</span> |
| { |
| <span class="macro">asm</span><span class="macro">!</span>(<span class="string">"cpuid"</span> |
| : <span class="string">"={eax}"</span>(<span class="ident">eax</span>), <span class="string">"={ebx}"</span>(<span class="ident">ebx</span>), <span class="string">"={ecx}"</span>(<span class="ident">ecx</span>), <span class="string">"={edx}"</span>(<span class="ident">edx</span>) |
| : <span class="string">"{eax}"</span>(<span class="ident">leaf</span>), <span class="string">"{ecx}"</span>(<span class="ident">sub_leaf</span>) |
| : :); |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>)]</span> |
| { |
| <span class="comment">// x86-64 uses %rbx as the base register, so preserve it.</span> |
| <span class="macro">asm</span><span class="macro">!</span>(<span class="string">"cpuid"</span> |
| : <span class="string">"={eax}"</span>(<span class="ident">eax</span>), <span class="string">"={ebx}"</span>(<span class="ident">ebx</span>), <span class="string">"={ecx}"</span>(<span class="ident">ecx</span>), <span class="string">"={edx}"</span>(<span class="ident">edx</span>) |
| : <span class="string">"{eax}"</span>(<span class="ident">leaf</span>), <span class="string">"{ecx}"</span>(<span class="ident">sub_leaf</span>) |
| : <span class="string">"rbx"</span> :); |
| } |
| <span class="ident">CpuidResult</span> { <span class="ident">eax</span>, <span class="ident">ebx</span>, <span class="ident">ecx</span>, <span class="ident">edx</span> } |
| } |
| |
| <span class="doccomment">/// See [`__cpuid_count`](fn.__cpuid_count.html).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="ident">cpuid</span>))]</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">__cpuid</span>(<span class="ident">leaf</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">CpuidResult</span> { |
| <span class="ident">__cpuid_count</span>(<span class="ident">leaf</span>, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Does the host support the `cpuid` instruction?</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_cpuid</span>() <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"sgx"</span>)]</span> |
| { |
| <span class="bool-val">false</span> |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"sgx"</span>), <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>))]</span> |
| { |
| <span class="bool-val">true</span> |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"sgx"</span>), <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>))]</span> |
| { |
| <span class="comment">// Optimization for i586 and i686 Rust targets which SSE enabled</span> |
| <span class="comment">// and support cpuid:</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_feature</span> <span class="op">=</span> <span class="string">"sse"</span>)]</span> |
| { |
| <span class="bool-val">true</span> |
| } |
| |
| <span class="comment">// If SSE is not enabled, detect whether cpuid is available:</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_feature</span> <span class="op">=</span> <span class="string">"sse"</span>))]</span> |
| <span class="kw">unsafe</span> { |
| <span class="comment">// On `x86` the `cpuid` instruction is not always available.</span> |
| <span class="comment">// This follows the approach indicated in:</span> |
| <span class="comment">// http://wiki.osdev.org/CPUID#Checking_CPUID_availability</span> |
| <span class="comment">// https://software.intel.com/en-us/articles/using-cpuid-to-detect-the-presence-of-sse-41-and-sse-42-instruction-sets/</span> |
| <span class="comment">// which detects whether `cpuid` is available by checking whether</span> |
| <span class="comment">// the 21st bit of the EFLAGS register is modifiable or not.</span> |
| <span class="comment">// If it is, then `cpuid` is available.</span> |
| <span class="kw">let</span> <span class="ident">result</span>: <span class="ident">u32</span>; |
| <span class="kw">let</span> <span class="ident">_temp</span>: <span class="ident">u32</span>; |
| <span class="macro">asm</span><span class="macro">!</span>(<span class="string">r#" |
| # Read eflags into $0 and copy it into $1: |
| pushfd |
| pop $0 |
| mov $1, $0 |
| # Flip 21st bit of $0. |
| xor $0, 0x200000 |
| # Set eflags to the value of $0 |
| # |
| # Bit 21st can only be modified if cpuid is available |
| push $0 |
| popfd # A |
| # Read eflags into $0: |
| pushfd # B |
| pop $0 |
| # xor with the original eflags sets the bits that |
| # have been modified: |
| xor $0, $1 |
| "#</span> |
| : <span class="string">"=r"</span>(<span class="ident">result</span>), <span class="string">"=r"</span>(<span class="ident">_temp</span>) |
| : |
| : <span class="string">"cc"</span>, <span class="string">"memory"</span> |
| : <span class="string">"intel"</span>); |
| <span class="comment">// There is a race between popfd (A) and pushfd (B)</span> |
| <span class="comment">// where other bits beyond 21st may have been modified due to</span> |
| <span class="comment">// interrupts, a debugger stepping through the asm, etc.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Therefore, explicitly check whether the 21st bit</span> |
| <span class="comment">// was modified or not.</span> |
| <span class="comment">//</span> |
| <span class="comment">// If the result is zero, the cpuid bit was not modified.</span> |
| <span class="comment">// If the result is `0x200000` (non-zero), then the cpuid</span> |
| <span class="comment">// was correctly modified and the CPU supports the cpuid</span> |
| <span class="comment">// instruction:</span> |
| (<span class="ident">result</span> <span class="op">&</span> <span class="number">0x200000</span>) <span class="op">!=</span> <span class="number">0</span> |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns the highest-supported `leaf` (`EAX`) and sub-leaf (`ECX`) `cpuid`</span> |
| <span class="doccomment">/// values.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If `cpuid` is supported, and `leaf` is zero, then the first tuple argument</span> |
| <span class="doccomment">/// contains the highest `leaf` value that `cpuid` supports. For `leaf`s</span> |
| <span class="doccomment">/// containing sub-leafs, the second tuple argument contains the</span> |
| <span class="doccomment">/// highest-supported sub-leaf value.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See also [`__cpuid`](fn.__cpuid.html) and</span> |
| <span class="doccomment">/// [`__cpuid_count`](fn.__cpuid_count.html).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_x86"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">__get_cpuid_max</span>(<span class="ident">leaf</span>: <span class="ident">u32</span>) <span class="op">-></span> (<span class="ident">u32</span>, <span class="ident">u32</span>) { |
| <span class="kw">let</span> <span class="ident">CpuidResult</span> { <span class="ident">eax</span>, <span class="ident">ebx</span>, .. } <span class="op">=</span> <span class="ident">__cpuid</span>(<span class="ident">leaf</span>); |
| (<span class="ident">eax</span>, <span class="ident">ebx</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">core_arch</span>::<span class="ident">x86</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_always_has_cpuid</span>() { |
| <span class="comment">// all currently-tested targets have the instruction</span> |
| <span class="comment">// FIXME: add targets without `cpuid` to CI</span> |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">cpuid</span>::<span class="ident">has_cpuid</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_has_cpuid_idempotent</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cpuid</span>::<span class="ident">has_cpuid</span>(), <span class="ident">cpuid</span>::<span class="ident">has_cpuid</span>()); |
| } |
| } |
| </pre></div> |
| </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "core_arch";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script><script defer src="../../../search-index.js"></script></body></html> |
