| <!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/libm-0.2.7/src/math/fmod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fmod.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="../../../libm/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="../../../libm/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>core::u64; |
| |
| <span class="attribute">#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] |
| </span><span class="kw">pub fn </span>fmod(x: f64, y: f64) -> f64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>uxi = x.to_bits(); |
| <span class="kw">let </span><span class="kw-2">mut </span>uyi = y.to_bits(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ex = (uxi >> <span class="number">52 </span>& <span class="number">0x7ff</span>) <span class="kw">as </span>i64; |
| <span class="kw">let </span><span class="kw-2">mut </span>ey = (uyi >> <span class="number">52 </span>& <span class="number">0x7ff</span>) <span class="kw">as </span>i64; |
| <span class="kw">let </span>sx = uxi >> <span class="number">63</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>i; |
| |
| <span class="kw">if </span>uyi << <span class="number">1 </span>== <span class="number">0 </span>|| y.is_nan() || ex == <span class="number">0x7ff </span>{ |
| <span class="kw">return </span>(x * y) / (x * y); |
| } |
| <span class="kw">if </span>uxi << <span class="number">1 </span><= uyi << <span class="number">1 </span>{ |
| <span class="kw">if </span>uxi << <span class="number">1 </span>== uyi << <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="number">0.0 </span>* x; |
| } |
| <span class="kw">return </span>x; |
| } |
| |
| <span class="comment">/* normalize x and y */ |
| </span><span class="kw">if </span>ex == <span class="number">0 </span>{ |
| i = uxi << <span class="number">12</span>; |
| <span class="kw">while </span>i >> <span class="number">63 </span>== <span class="number">0 </span>{ |
| ex -= <span class="number">1</span>; |
| i <<= <span class="number">1</span>; |
| } |
| uxi <<= -ex + <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| uxi &= u64::MAX >> <span class="number">12</span>; |
| uxi |= <span class="number">1 </span><< <span class="number">52</span>; |
| } |
| <span class="kw">if </span>ey == <span class="number">0 </span>{ |
| i = uyi << <span class="number">12</span>; |
| <span class="kw">while </span>i >> <span class="number">63 </span>== <span class="number">0 </span>{ |
| ey -= <span class="number">1</span>; |
| i <<= <span class="number">1</span>; |
| } |
| uyi <<= -ey + <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| uyi &= u64::MAX >> <span class="number">12</span>; |
| uyi |= <span class="number">1 </span><< <span class="number">52</span>; |
| } |
| |
| <span class="comment">/* x mod y */ |
| </span><span class="kw">while </span>ex > ey { |
| i = uxi.wrapping_sub(uyi); |
| <span class="kw">if </span>i >> <span class="number">63 </span>== <span class="number">0 </span>{ |
| <span class="kw">if </span>i == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="number">0.0 </span>* x; |
| } |
| uxi = i; |
| } |
| uxi <<= <span class="number">1</span>; |
| ex -= <span class="number">1</span>; |
| } |
| i = uxi.wrapping_sub(uyi); |
| <span class="kw">if </span>i >> <span class="number">63 </span>== <span class="number">0 </span>{ |
| <span class="kw">if </span>i == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="number">0.0 </span>* x; |
| } |
| uxi = i; |
| } |
| <span class="kw">while </span>uxi >> <span class="number">52 </span>== <span class="number">0 </span>{ |
| uxi <<= <span class="number">1</span>; |
| ex -= <span class="number">1</span>; |
| } |
| |
| <span class="comment">/* scale result */ |
| </span><span class="kw">if </span>ex > <span class="number">0 </span>{ |
| uxi -= <span class="number">1 </span><< <span class="number">52</span>; |
| uxi |= (ex <span class="kw">as </span>u64) << <span class="number">52</span>; |
| } <span class="kw">else </span>{ |
| uxi >>= -ex + <span class="number">1</span>; |
| } |
| uxi |= (sx <span class="kw">as </span>u64) << <span class="number">63</span>; |
| |
| f64::from_bits(uxi) |
| } |
| </code></pre></div> |
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