| <!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/pretty/mantissa.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mantissa.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> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::digit_table::<span class="kw-2">*</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 unsafe fn </span>write_mantissa_long(<span class="kw-2">mut </span>output: u64, <span class="kw-2">mut </span>result: <span class="kw-2">*mut </span>u8) { |
| <span class="kw">if </span>(output >> <span class="number">32</span>) != <span class="number">0 </span>{ |
| <span class="comment">// One expensive 64-bit division. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>output2 = (output - <span class="number">100_000_000 </span>* (output / <span class="number">100_000_000</span>)) <span class="kw">as </span>u32; |
| output /= <span class="number">100_000_000</span>; |
| |
| <span class="kw">let </span>c = output2 % <span class="number">10_000</span>; |
| output2 /= <span class="number">10_000</span>; |
| <span class="kw">let </span>d = output2 % <span class="number">10_000</span>; |
| <span class="kw">let </span>c0 = (c % <span class="number">100</span>) << <span class="number">1</span>; |
| <span class="kw">let </span>c1 = (c / <span class="number">100</span>) << <span class="number">1</span>; |
| <span class="kw">let </span>d0 = (d % <span class="number">100</span>) << <span class="number">1</span>; |
| <span class="kw">let </span>d1 = (d / <span class="number">100</span>) << <span class="number">1</span>; |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c0 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">2</span>), |
| <span class="number">2</span>, |
| ); |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c1 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">4</span>), |
| <span class="number">2</span>, |
| ); |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(d0 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">6</span>), |
| <span class="number">2</span>, |
| ); |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(d1 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">8</span>), |
| <span class="number">2</span>, |
| ); |
| result = result.offset(-<span class="number">8</span>); |
| } |
| write_mantissa(output <span class="kw">as </span>u32, result); |
| } |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"no-panic"</span>, inline)] |
| </span><span class="kw">pub unsafe fn </span>write_mantissa(<span class="kw-2">mut </span>output: u32, <span class="kw-2">mut </span>result: <span class="kw-2">*mut </span>u8) { |
| <span class="kw">while </span>output >= <span class="number">10_000 </span>{ |
| <span class="kw">let </span>c = output - <span class="number">10_000 </span>* (output / <span class="number">10_000</span>); |
| output /= <span class="number">10_000</span>; |
| <span class="kw">let </span>c0 = (c % <span class="number">100</span>) << <span class="number">1</span>; |
| <span class="kw">let </span>c1 = (c / <span class="number">100</span>) << <span class="number">1</span>; |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c0 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">2</span>), |
| <span class="number">2</span>, |
| ); |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c1 <span class="kw">as </span>isize), |
| result.offset(-<span class="number">4</span>), |
| <span class="number">2</span>, |
| ); |
| result = result.offset(-<span class="number">4</span>); |
| } |
| <span class="kw">if </span>output >= <span class="number">100 </span>{ |
| <span class="kw">let </span>c = (output % <span class="number">100</span>) << <span class="number">1</span>; |
| output /= <span class="number">100</span>; |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c <span class="kw">as </span>isize), |
| result.offset(-<span class="number">2</span>), |
| <span class="number">2</span>, |
| ); |
| result = result.offset(-<span class="number">2</span>); |
| } |
| <span class="kw">if </span>output >= <span class="number">10 </span>{ |
| <span class="kw">let </span>c = output << <span class="number">1</span>; |
| ptr::copy_nonoverlapping( |
| DIGIT_TABLE.as_ptr().offset(c <span class="kw">as </span>isize), |
| result.offset(-<span class="number">2</span>), |
| <span class="number">2</span>, |
| ); |
| } <span class="kw">else </span>{ |
| <span class="kw-2">*</span>result.offset(-<span class="number">1</span>) = <span class="string">b'0' </span>+ output <span class="kw">as </span>u8; |
| } |
| } |
| </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> |