| <!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/tanf.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>tanf.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="comment">/* origin: FreeBSD /usr/src/lib/msun/src/s_tanf.c */ |
| /* |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| * Optimized by Bruce D. Evans. |
| */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| </span><span class="kw">use super</span>::{k_tanf, rem_pio2f}; |
| |
| <span class="kw">use </span>core::f64::consts::FRAC_PI_2; |
| |
| <span class="comment">/* Small multiples of pi/2 rounded to double precision. */ |
| </span><span class="kw">const </span>T1_PIO2: f64 = <span class="number">1. </span>* FRAC_PI_2; <span class="comment">/* 0x3FF921FB, 0x54442D18 */ |
| </span><span class="kw">const </span>T2_PIO2: f64 = <span class="number">2. </span>* FRAC_PI_2; <span class="comment">/* 0x400921FB, 0x54442D18 */ |
| </span><span class="kw">const </span>T3_PIO2: f64 = <span class="number">3. </span>* FRAC_PI_2; <span class="comment">/* 0x4012D97C, 0x7F3321D2 */ |
| </span><span class="kw">const </span>T4_PIO2: f64 = <span class="number">4. </span>* FRAC_PI_2; <span class="comment">/* 0x401921FB, 0x54442D18 */ |
| |
| </span><span class="attribute">#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] |
| </span><span class="kw">pub fn </span>tanf(x: f32) -> f32 { |
| <span class="kw">let </span>x64 = x <span class="kw">as </span>f64; |
| |
| <span class="kw">let </span>x1p120 = f32::from_bits(<span class="number">0x7b800000</span>); <span class="comment">// 0x1p120f === 2 ^ 120 |
| |
| </span><span class="kw">let </span><span class="kw-2">mut </span>ix = x.to_bits(); |
| <span class="kw">let </span>sign = (ix >> <span class="number">31</span>) != <span class="number">0</span>; |
| ix &= <span class="number">0x7fffffff</span>; |
| |
| <span class="kw">if </span>ix <= <span class="number">0x3f490fda </span>{ |
| <span class="comment">/* |x| ~<= pi/4 */ |
| </span><span class="kw">if </span>ix < <span class="number">0x39800000 </span>{ |
| <span class="comment">/* |x| < 2**-12 */ |
| /* raise inexact if x!=0 and underflow if subnormal */ |
| </span><span class="macro">force_eval!</span>(<span class="kw">if </span>ix < <span class="number">0x00800000 </span>{ |
| x / x1p120 |
| } <span class="kw">else </span>{ |
| x + x1p120 |
| }); |
| <span class="kw">return </span>x; |
| } |
| <span class="kw">return </span>k_tanf(x64, <span class="bool-val">false</span>); |
| } |
| <span class="kw">if </span>ix <= <span class="number">0x407b53d1 </span>{ |
| <span class="comment">/* |x| ~<= 5*pi/4 */ |
| </span><span class="kw">if </span>ix <= <span class="number">0x4016cbe3 </span>{ |
| <span class="comment">/* |x| ~<= 3pi/4 */ |
| </span><span class="kw">return </span>k_tanf(<span class="kw">if </span>sign { x64 + T1_PIO2 } <span class="kw">else </span>{ x64 - T1_PIO2 }, <span class="bool-val">true</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>k_tanf(<span class="kw">if </span>sign { x64 + T2_PIO2 } <span class="kw">else </span>{ x64 - T2_PIO2 }, <span class="bool-val">false</span>); |
| } |
| } |
| <span class="kw">if </span>ix <= <span class="number">0x40e231d5 </span>{ |
| <span class="comment">/* |x| ~<= 9*pi/4 */ |
| </span><span class="kw">if </span>ix <= <span class="number">0x40afeddf </span>{ |
| <span class="comment">/* |x| ~<= 7*pi/4 */ |
| </span><span class="kw">return </span>k_tanf(<span class="kw">if </span>sign { x64 + T3_PIO2 } <span class="kw">else </span>{ x64 - T3_PIO2 }, <span class="bool-val">true</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>k_tanf(<span class="kw">if </span>sign { x64 + T4_PIO2 } <span class="kw">else </span>{ x64 - T4_PIO2 }, <span class="bool-val">false</span>); |
| } |
| } |
| |
| <span class="comment">/* tan(Inf or NaN) is NaN */ |
| </span><span class="kw">if </span>ix >= <span class="number">0x7f800000 </span>{ |
| <span class="kw">return </span>x - x; |
| } |
| |
| <span class="comment">/* argument reduction */ |
| </span><span class="kw">let </span>(n, y) = rem_pio2f(x); |
| k_tanf(y, n & <span class="number">1 </span>!= <span class="number">0</span>) |
| } |
| </code></pre></div> |
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