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</pre><pre class="rust"><code><span class="doccomment">//! libm in pure Rust</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">warnings</span>)]</span>
<span class="attribute">#![<span class="ident">no_std</span>]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(
<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;unstable&quot;</span>),
<span class="ident">feature</span>(<span class="ident">core_intrinsics</span>)
)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::unreadable_literal</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::many_single_char_names</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::needless_return</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::int_plus_one</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::deprecated_cfg_attr</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::mixed_case_hex_literals</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::float_cmp</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::eq_op</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::assign_op_pattern</span>)]</span>
<span class="kw">mod</span> <span class="ident">math</span>;
<span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">f32</span>, <span class="ident">f64</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="self">self</span>::math</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Approximate equality with 1 ULP of tolerance</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">_eqf</span>(<span class="ident">a</span>: <span class="ident">f32</span>, <span class="ident">b</span>: <span class="ident">f32</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">u32</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="ident">a</span>.<span class="ident">is_nan</span>() <span class="op">&amp;&amp;</span> <span class="ident">b</span>.<span class="ident">is_nan</span>() {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> (<span class="ident">a</span>.<span class="ident">to_bits</span>() <span class="kw">as</span> <span class="ident">i32</span>).<span class="ident">wrapping_sub</span>(<span class="ident">b</span>.<span class="ident">to_bits</span>() <span class="kw">as</span> <span class="ident">i32</span>).<span class="ident">abs</span>();
<span class="kw">if</span> <span class="ident">err</span> <span class="op">&lt;</span><span class="op">=</span> <span class="number">1</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">err</span> <span class="kw">as</span> <span class="ident">u32</span>)
}
}
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">_eq</span>(<span class="ident">a</span>: <span class="ident">f64</span>, <span class="ident">b</span>: <span class="ident">f64</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">u64</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="ident">a</span>.<span class="ident">is_nan</span>() <span class="op">&amp;&amp;</span> <span class="ident">b</span>.<span class="ident">is_nan</span>() {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> (<span class="ident">a</span>.<span class="ident">to_bits</span>() <span class="kw">as</span> <span class="ident">i64</span>).<span class="ident">wrapping_sub</span>(<span class="ident">b</span>.<span class="ident">to_bits</span>() <span class="kw">as</span> <span class="ident">i64</span>).<span class="ident">abs</span>();
<span class="kw">if</span> <span class="ident">err</span> <span class="op">&lt;</span><span class="op">=</span> <span class="number">1</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">err</span> <span class="kw">as</span> <span class="ident">u64</span>)
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;musl-reference-tests&quot;</span>))]</span>
<span class="macro">include!</span>(<span class="macro">concat!</span>(<span class="macro">env!</span>(<span class="string">&quot;OUT_DIR&quot;</span>), <span class="string">&quot;/musl-tests.rs&quot;</span>));
</code></pre></div>
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