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| </pre><pre class="rust"><code><span class="comment">/* origin: FreeBSD /usr/src/lib/msun/src/k_tan.c */</span> |
| <span class="comment">/* |
| * ==================================================== |
| * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
| * |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */</span> |
| |
| <span class="comment">/* |tan(x)/x - t(x)| < 2**-25.5 (~[-2e-08, 2e-08]). */</span> |
| <span class="kw">const</span> <span class="ident">T</span>: [<span class="ident">f64</span>; <span class="number">6</span>] <span class="op">=</span> [ |
| <span class="number">0.333331395030791399758</span>, <span class="comment">/* 0x15554d3418c99f.0p-54 */</span> |
| <span class="number">0.133392002712976742718</span>, <span class="comment">/* 0x1112fd38999f72.0p-55 */</span> |
| <span class="number">0.0533812378445670393523</span>, <span class="comment">/* 0x1b54c91d865afe.0p-57 */</span> |
| <span class="number">0.0245283181166547278873</span>, <span class="comment">/* 0x191df3908c33ce.0p-58 */</span> |
| <span class="number">0.00297435743359967304927</span>, <span class="comment">/* 0x185dadfcecf44e.0p-61 */</span> |
| <span class="number">0.00946564784943673166728</span>, <span class="comment">/* 0x1362b9bf971bcd.0p-59 */</span> |
| ]; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">assert_no_panic</span>), <span class="ident">no_panic::no_panic</span>)]</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">k_tanf</span>(<span class="ident">x</span>: <span class="ident">f64</span>, <span class="ident">odd</span>: <span class="ident">bool</span>) -> <span class="ident">f32</span> { |
| <span class="kw">let</span> <span class="ident">z</span> <span class="op">=</span> <span class="ident">x</span> <span class="op">*</span> <span class="ident">x</span>; |
| <span class="comment">/* |
| * Split up the polynomial into small independent terms to give |
| * opportunities for parallel evaluation. The chosen splitting is |
| * micro-optimized for Athlons (XP, X64). It costs 2 multiplications |
| * relative to Horner's method on sequential machines. |
| * |
| * We add the small terms from lowest degree up for efficiency on |
| * non-sequential machines (the lowest degree terms tend to be ready |
| * earlier). Apart from this, we don't care about order of |
| * operations, and don't need to to care since we have precision to |
| * spare. However, the chosen splitting is good for accuracy too, |
| * and would give results as accurate as Horner's method if the |
| * small terms were added from highest degree down. |
| */</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">T</span>[<span class="number">4</span>] <span class="op">+</span> <span class="ident">z</span> <span class="op">*</span> <span class="ident">T</span>[<span class="number">5</span>]; |
| <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">T</span>[<span class="number">2</span>] <span class="op">+</span> <span class="ident">z</span> <span class="op">*</span> <span class="ident">T</span>[<span class="number">3</span>]; |
| <span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">z</span> <span class="op">*</span> <span class="ident">z</span>; |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">z</span> <span class="op">*</span> <span class="ident">x</span>; |
| <span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">T</span>[<span class="number">0</span>] <span class="op">+</span> <span class="ident">z</span> <span class="op">*</span> <span class="ident">T</span>[<span class="number">1</span>]; |
| <span class="ident">r</span> <span class="op">=</span> (<span class="ident">x</span> <span class="op">+</span> <span class="ident">s</span> <span class="op">*</span> <span class="ident">u</span>) <span class="op">+</span> (<span class="ident">s</span> <span class="op">*</span> <span class="ident">w</span>) <span class="op">*</span> (<span class="ident">t</span> <span class="op">+</span> <span class="ident">w</span> <span class="op">*</span> <span class="ident">r</span>); |
| (<span class="kw">if</span> <span class="ident">odd</span> { <span class="op">-</span><span class="number">1.</span> <span class="op">/</span> <span class="ident">r</span> } <span class="kw">else</span> { <span class="ident">r</span> }) <span class="kw">as</span> <span class="ident">f32</span> |
| } |
| </code></pre></div> |
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