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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Bit Manipulation Instruction (BMI) Set 1.0.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The reference is [Intel 64 and IA-32 Architectures Software Developer&#39;s</span>
<span class="doccomment">//! Manual Volume 2: Instruction Set Reference, A-Z][intel64_ref].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [Wikipedia][wikipedia_bmi] provides a quick overview of the instructions</span>
<span class="doccomment">//! available.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [intel64_ref]: http://www.intel.de/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf</span>
<span class="doccomment">//! [wikipedia_bmi]: https://en.wikipedia.org/wiki/Bit_Manipulation_Instruction_Sets#ABM_.28Advanced_Bit_Manipulation.29</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="doccomment">/// Extracts bits in range [`start`, `start` + `length`) from `a` into</span>
<span class="doccomment">/// the least significant bits of the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bextr_u64)</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;bmi1&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">bextr</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</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">_bextr_u64</span>(<span class="ident">a</span>: <span class="ident">u64</span>, <span class="ident">start</span>: <span class="ident">u32</span>, <span class="ident">len</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">_bextr2_u64</span>(<span class="ident">a</span>, ((<span class="ident">start</span> <span class="op">&amp;</span> <span class="number">0xff</span>) <span class="op">|</span> ((<span class="ident">len</span> <span class="op">&amp;</span> <span class="number">0xff</span>) <span class="op">&lt;&lt;</span> <span class="number">8</span>)) <span class="kw">as</span> <span class="ident">u64</span>)
}

<span class="doccomment">/// Extracts bits of `a` specified by `control` into</span>
<span class="doccomment">/// the least significant bits of the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Bits `[7,0]` of `control` specify the index to the first bit in the range</span>
<span class="doccomment">/// to be extracted, and bits `[15,8]` specify the length of the range.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bextr2_u64)</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;bmi1&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">bextr</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</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">_bextr2_u64</span>(<span class="ident">a</span>: <span class="ident">u64</span>, <span class="ident">control</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">x86_bmi_bextr_64</span>(<span class="ident">a</span>, <span class="ident">control</span>)
}

<span class="doccomment">/// Bitwise logical `AND` of inverted `a` with `b`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_andn_u64)</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;bmi1&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">andn</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">_andn_u64</span>(<span class="ident">a</span>: <span class="ident">u64</span>, <span class="ident">b</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="op">!</span><span class="ident">a</span> <span class="op">&amp;</span> <span class="ident">b</span>
}

<span class="doccomment">/// Extracts lowest set isolated bit.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_blsi_u64)</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;bmi1&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">blsi</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>))]</span> <span class="comment">// generates lots of instructions</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">_blsi_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">x</span> <span class="op">&amp;</span> <span class="ident">x</span>.<span class="ident">wrapping_neg</span>()
}

<span class="doccomment">/// Gets mask up to lowest set bit.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_blsmsk_u64)</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;bmi1&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">blsmsk</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>))]</span> <span class="comment">// generates lots of instructions</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">_blsmsk_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">x</span> <span class="op">^</span> (<span class="ident">x</span>.<span class="ident">wrapping_sub</span>(<span class="number">1_u64</span>))
}

<span class="doccomment">/// Resets the lowest set bit of `x`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `x` is sets CF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_blsr_u64)</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;bmi1&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">blsr</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>))]</span> <span class="comment">// generates lots of instructions</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">_blsr_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">x</span> <span class="op">&amp;</span> (<span class="ident">x</span>.<span class="ident">wrapping_sub</span>(<span class="number">1</span>))
}

<span class="doccomment">/// Counts the number of trailing least significant zero bits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the source operand is `0`, it returns its size in bits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_tzcnt_u64)</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;bmi1&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">tzcnt</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">_tzcnt_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> {
    <span class="ident">x</span>.<span class="ident">trailing_zeros</span>() <span class="kw">as</span> <span class="ident">u64</span>
}

<span class="doccomment">/// Counts the number of trailing least significant zero bits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the source operand is `0`, it returns its size in bits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Intel&#39;s documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_tzcnt_64)</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;bmi1&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">tzcnt</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">_mm_tzcnt_64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">i64</span> {
    <span class="ident">x</span>.<span class="ident">trailing_zeros</span>() <span class="kw">as</span> <span class="ident">i64</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.bmi.bextr.64&quot;</span>]</span>
    <span class="kw">fn</span> <span class="ident">x86_bmi_bextr_64</span>(<span class="ident">x</span>: <span class="ident">u64</span>, <span class="ident">y</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">u64</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">stdsimd_test</span>::<span class="ident">simd_test</span>;

    <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">core_arch</span>::{<span class="ident">x86</span>::<span class="kw-2">*</span>, <span class="ident">x86_64</span>::<span class="kw-2">*</span>};

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_bextr_u64</span>() {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_bextr_u64</span>(<span class="number">0b0101_0000u64</span>, <span class="number">4</span>, <span class="number">4</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0000_0101u64</span>);
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_andn_u64</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_andn_u64</span>(<span class="number">0</span>, <span class="number">0</span>), <span class="number">0</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_andn_u64</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_andn_u64</span>(<span class="number">1</span>, <span class="number">0</span>), <span class="number">0</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_andn_u64</span>(<span class="number">1</span>, <span class="number">1</span>), <span class="number">0</span>);

        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_andn_u64</span>(<span class="number">0b0000_0000u64</span>, <span class="number">0b0000_0000u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0000_0000u64</span>);

        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_andn_u64</span>(<span class="number">0b0000_0000u64</span>, <span class="number">0b1111_1111u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b1111_1111u64</span>);

        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_andn_u64</span>(<span class="number">0b1111_1111u64</span>, <span class="number">0b0000_0000u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0000_0000u64</span>);

        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_andn_u64</span>(<span class="number">0b1111_1111u64</span>, <span class="number">0b1111_1111u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0000_0000u64</span>);

        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_andn_u64</span>(<span class="number">0b0100_0000u64</span>, <span class="number">0b0101_1101u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0001_1101u64</span>);
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_blsi_u64</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_blsi_u64</span>(<span class="number">0b1101_0000u64</span>), <span class="number">0b0001_0000u64</span>);
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_blsmsk_u64</span>() {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_blsmsk_u64</span>(<span class="number">0b0011_0000u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0001_1111u64</span>);
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_blsr_u64</span>() {
        <span class="comment">// TODO: test the behavior when the input is `0`.</span>
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">_blsr_u64</span>(<span class="number">0b0011_0000u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0b0010_0000u64</span>);
    }

    <span class="attribute">#[<span class="ident">simd_test</span>(<span class="ident">enable</span> <span class="op">=</span> <span class="string">&quot;bmi1&quot;</span>)]</span>
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">test_tzcnt_u64</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_tzcnt_u64</span>(<span class="number">0b0000_0001u64</span>), <span class="number">0u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_tzcnt_u64</span>(<span class="number">0b0000_0000u64</span>), <span class="number">64u64</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">_tzcnt_u64</span>(<span class="number">0b1001_0000u64</span>), <span class="number">4u64</span>);
    }
}
</pre></div>
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