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</pre><pre class="rust ">
<span class="doccomment">//! FXSR floating-point context fast save and restor.</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">use</span> <span class="ident">stdsimd_test</span>::<span class="ident">assert_instr</span>;

<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">improper_ctypes</span>)]</span>
<span class="kw">extern</span> <span class="string">&quot;C&quot;</span> {
    <span class="attribute">#[<span class="ident">link_name</span> <span class="op">=</span> <span class="string">&quot;llvm.x86.fxsave&quot;</span>]</span>
    <span class="kw">fn</span> <span class="ident">fxsave</span>(<span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>) <span class="op">-&gt;</span> ();
    <span class="attribute">#[<span class="ident">link_name</span> <span class="op">=</span> <span class="string">&quot;llvm.x86.fxrstor&quot;</span>]</span>
    <span class="kw">fn</span> <span class="ident">fxrstor</span>(<span class="ident">p</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>) <span class="op">-&gt;</span> ();
}

<span class="doccomment">/// Saves the `x87` FPU, `MMX` technology, `XMM`, and `MXCSR` registers to the</span>
<span class="doccomment">/// 512-byte-long 16-byte-aligned memory region `mem_addr`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A misaligned destination operand raises a general-protection (#GP) or an</span>
<span class="doccomment">/// alignment check exception (#AC).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`FXSAVE`][fxsave] and [`FXRSTOR`][fxrstor].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [fxsave]: http://www.felixcloutier.com/x86/FXSAVE.html</span>
<span class="doccomment">/// [fxrstor]: http://www.felixcloutier.com/x86/FXRSTOR.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_fxsave)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">target_feature</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;fxsr&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="ident">fxsave</span>))]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;simd_x86&quot;</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">&quot;1.27.0&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">_fxsave</span>(<span class="ident">mem_addr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>) {
    <span class="ident">fxsave</span>(<span class="ident">mem_addr</span>)
}

<span class="doccomment">/// Restores the `XMM`, `MMX`, `MXCSR`, and `x87` FPU registers from the</span>
<span class="doccomment">/// 512-byte-long 16-byte-aligned memory region `mem_addr`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The contents of this memory region should have been written to by a</span>
<span class="doccomment">/// previous</span>
<span class="doccomment">/// `_fxsave` or `_fxsave64` intrinsic.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A misaligned destination operand raises a general-protection (#GP) or an</span>
<span class="doccomment">/// alignment check exception (#AC).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`FXSAVE`][fxsave] and [`FXRSTOR`][fxrstor].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [fxsave]: http://www.felixcloutier.com/x86/FXSAVE.html</span>
<span class="doccomment">/// [fxrstor]: http://www.felixcloutier.com/x86/FXRSTOR.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_fxrstor)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">target_feature</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;fxsr&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="ident">fxrstor</span>))]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;simd_x86&quot;</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">&quot;1.27.0&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">_fxrstor</span>(<span class="ident">mem_addr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>) {
    <span class="ident">fxrstor</span>(<span class="ident">mem_addr</span>)
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="ident">coresimd</span>::<span class="ident">x86</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">fmt</span>, <span class="ident">cmp</span>::<span class="ident">PartialEq</span>};
    <span class="kw">use</span> <span class="ident">stdsimd_test</span>::<span class="ident">simd_test</span>;

    <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">align</span>(<span class="number">16</span>))]</span>
    <span class="kw">struct</span> <span class="ident">FxsaveArea</span> {
        <span class="ident">data</span>: [<span class="ident">u8</span>; <span class="number">512</span>], <span class="comment">// 512 bytes</span>
    }

    <span class="kw">impl</span> <span class="ident">FxsaveArea</span> {
        <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">FxsaveArea</span> {
            <span class="ident">FxsaveArea</span> { <span class="ident">data</span>: [<span class="number">0</span>; <span class="number">512</span>] }
        }
        <span class="kw">fn</span> <span class="ident">ptr</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">data</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>
        }
    }

    <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op">&lt;</span><span class="ident">FxsaveArea</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">FxsaveArea</span> {
        <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">FxsaveArea</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
            <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">len</span>() {
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">data</span>[<span class="ident">i</span>] <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">data</span>[<span class="ident">i</span>] {
                    <span class="kw">return</span> <span class="bool-val">false</span>;
                }
            }
            <span class="bool-val">true</span>
        }
    }

    <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">FxsaveArea</span> {
        <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
            <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">len</span>() {
                <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.<span class="ident">data</span>[<span class="ident">i</span>])<span class="question-mark">?</span>;
                <span class="kw">if</span> <span class="ident">i</span> <span class="op">!=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> {
                    <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;, &quot;</span>)<span class="question-mark">?</span>;
                }
            }
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;]&quot;</span>)
        }
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;fxsr&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">fxsave</span>() {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">FxsaveArea</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">FxsaveArea</span>::<span class="ident">new</span>();

        <span class="ident">fxsr</span>::<span class="ident">_fxsave</span>(<span class="ident">a</span>.<span class="ident">ptr</span>());
        <span class="ident">fxsr</span>::<span class="ident">_fxrstor</span>(<span class="ident">a</span>.<span class="ident">ptr</span>());
        <span class="ident">fxsr</span>::<span class="ident">_fxsave</span>(<span class="ident">b</span>.<span class="ident">ptr</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>, <span class="ident">b</span>);
    }
}
</pre>
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