| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/ryu-1.0.13/src/d2s_intrinsics.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>d2s_intrinsics.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../ryu/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../ryu/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-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> |
| </pre><pre class="rust"><code><span class="comment">// Translated from C to Rust. The original C code can be found at |
| // https://github.com/ulfjack/ryu and carries the following license: |
| // |
| // Copyright 2018 Ulf Adams |
| // |
| // The contents of this file may be used under the terms of the Apache License, |
| // Version 2.0. |
| // |
| // (See accompanying file LICENSE-Apache or copy at |
| // http://www.apache.org/licenses/LICENSE-2.0) |
| // |
| // Alternatively, the contents of this file may be used under the terms of |
| // the Boost Software License, Version 1.0. |
| // (See accompanying file LICENSE-Boost or copy at |
| // https://www.boost.org/LICENSE_1_0.txt) |
| // |
| // Unless required by applicable law or agreed to in writing, this software |
| // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. |
| |
| </span><span class="kw">use </span>core::ptr; |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>div5(x: u64) -> u64 { |
| x / <span class="number">5 |
| </span>} |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>div10(x: u64) -> u64 { |
| x / <span class="number">10 |
| </span>} |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>div100(x: u64) -> u64 { |
| x / <span class="number">100 |
| </span>} |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">fn </span>pow5_factor(<span class="kw-2">mut </span>value: u64) -> u32 { |
| <span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">0u32</span>; |
| <span class="kw">loop </span>{ |
| <span class="macro">debug_assert!</span>(value != <span class="number">0</span>); |
| <span class="kw">let </span>q = div5(value); |
| <span class="kw">let </span>r = (value <span class="kw">as </span>u32).wrapping_sub(<span class="number">5u32</span>.wrapping_mul(q <span class="kw">as </span>u32)); |
| <span class="kw">if </span>r != <span class="number">0 </span>{ |
| <span class="kw">break</span>; |
| } |
| value = q; |
| count += <span class="number">1</span>; |
| } |
| count |
| } |
| |
| <span class="comment">// Returns true if value is divisible by 5^p. |
| </span><span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>multiple_of_power_of_5(value: u64, p: u32) -> bool { |
| <span class="comment">// I tried a case distinction on p, but there was no performance difference. |
| </span>pow5_factor(value) >= p |
| } |
| |
| <span class="comment">// Returns true if value is divisible by 2^p. |
| </span><span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>multiple_of_power_of_2(value: u64, p: u32) -> bool { |
| <span class="macro">debug_assert!</span>(value != <span class="number">0</span>); |
| <span class="macro">debug_assert!</span>(p < <span class="number">64</span>); |
| <span class="comment">// __builtin_ctzll doesn't appear to be faster here. |
| </span>(value & ((<span class="number">1u64 </span><< p) - <span class="number">1</span>)) == <span class="number">0 |
| </span>} |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub fn </span>mul_shift_64(m: u64, mul: <span class="kw-2">&</span>(u64, u64), j: u32) -> u64 { |
| <span class="kw">let </span>b0 = m <span class="kw">as </span>u128 * mul.<span class="number">0 </span><span class="kw">as </span>u128; |
| <span class="kw">let </span>b2 = m <span class="kw">as </span>u128 * mul.<span class="number">1 </span><span class="kw">as </span>u128; |
| (((b0 >> <span class="number">64</span>) + b2) >> (j - <span class="number">64</span>)) <span class="kw">as </span>u64 |
| } |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub unsafe fn </span>mul_shift_all_64( |
| m: u64, |
| mul: <span class="kw-2">&</span>(u64, u64), |
| j: u32, |
| vp: <span class="kw-2">*mut </span>u64, |
| vm: <span class="kw-2">*mut </span>u64, |
| mm_shift: u32, |
| ) -> u64 { |
| ptr::write(vp, mul_shift_64(<span class="number">4 </span>* m + <span class="number">2</span>, mul, j)); |
| ptr::write(vm, mul_shift_64(<span class="number">4 </span>* m - <span class="number">1 </span>- mm_shift <span class="kw">as </span>u64, mul, j)); |
| mul_shift_64(<span class="number">4 </span>* m, mul, j) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ryu" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
