<!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 `/Users/erlendbasso/.cargo/registry/src/github.com-1ecc6299db9ec823/libm-0.2.6/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="../../../static.files/SourceSerif4-Regular-1f7d512b176f0f72.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Bold-124a1ca42af929b6.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-6827029ac823cab7.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../../static.files/light-ebce58d0a40c3431.css"><link rel="stylesheet" disabled href="../../../static.files/dark-f23faae4a2daf9a6.css"><link rel="stylesheet" disabled href="../../../static.files/ayu-8af5e100b21cd173.css"><script id="default-settings" ></script><script src="../../../static.files/storage-d43fa987303ecbbb.js"></script><script defer src="../../../static.files/source-script-5cf2e01a42cc9858.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../static.files/main-c55e1eb52e1886b4.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.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"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../libm/index.html"><img class="rust-logo" src="../../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../../static.files/wheel-5ec35bf9ca753509.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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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="attr">#[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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