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<span class="doccomment">//! Extended precision &quot;soft float&quot;, for internal use only.</span>

<span class="comment">// This module is only for dec2flt and flt2dec, and only public because of coretests.</span>
<span class="comment">// It is not intended to ever be stabilized.</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#![<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;core_private_diy_float&quot;</span>,
            <span class="ident">reason</span> <span class="op">=</span> <span class="string">&quot;internal routines only exposed for testing&quot;</span>,
            <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>

<span class="doccomment">/// A custom 64-bit floating point type, representing `f * 2^e`.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Fp</span> {
    <span class="doccomment">/// The integer mantissa.</span>
    <span class="kw">pub</span> <span class="ident">f</span>: <span class="ident">u64</span>,
    <span class="doccomment">/// The exponent in base 2.</span>
    <span class="kw">pub</span> <span class="ident">e</span>: <span class="ident">i16</span>,
}

<span class="kw">impl</span> <span class="ident">Fp</span> {
    <span class="doccomment">/// Returns a correctly rounded product of itself and `other`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mul</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">Fp</span>) <span class="op">-&gt;</span> <span class="ident">Fp</span> {
        <span class="kw">const</span> <span class="ident">MASK</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0xffffffff</span>;
        <span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">f</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>;
        <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">f</span> <span class="op">&amp;</span> <span class="ident">MASK</span>;
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">f</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>;
        <span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">f</span> <span class="op">&amp;</span> <span class="ident">MASK</span>;
        <span class="kw">let</span> <span class="ident">ac</span> <span class="op">=</span> <span class="ident">a</span> <span class="op">*</span> <span class="ident">c</span>;
        <span class="kw">let</span> <span class="ident">bc</span> <span class="op">=</span> <span class="ident">b</span> <span class="op">*</span> <span class="ident">c</span>;
        <span class="kw">let</span> <span class="ident">ad</span> <span class="op">=</span> <span class="ident">a</span> <span class="op">*</span> <span class="ident">d</span>;
        <span class="kw">let</span> <span class="ident">bd</span> <span class="op">=</span> <span class="ident">b</span> <span class="op">*</span> <span class="ident">d</span>;
        <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> (<span class="ident">bd</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>) <span class="op">+</span> (<span class="ident">ad</span> <span class="op">&amp;</span> <span class="ident">MASK</span>) <span class="op">+</span> (<span class="ident">bc</span> <span class="op">&amp;</span> <span class="ident">MASK</span>) <span class="op">+</span> (<span class="number">1</span> <span class="op">&lt;&lt;</span> <span class="number">31</span>) <span class="comment">/* round */</span>;
        <span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">ac</span> <span class="op">+</span> (<span class="ident">ad</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>) <span class="op">+</span> (<span class="ident">bc</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>) <span class="op">+</span> (<span class="ident">tmp</span> <span class="op">&gt;&gt;</span> <span class="number">32</span>);
        <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">e</span> <span class="op">+</span> <span class="ident">other</span>.<span class="ident">e</span> <span class="op">+</span> <span class="number">64</span>;
        <span class="ident">Fp</span> { <span class="ident">f</span>, <span class="ident">e</span> }
    }

    <span class="doccomment">/// Normalizes itself so that the resulting mantissa is at least `2^63`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">normalize</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Fp</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">f</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">f</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">e</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">e</span>;
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">32</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">32</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">32</span>;
        }
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">16</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">16</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">16</span>;
        }
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">8</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">8</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">8</span>;
        }
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">4</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">4</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">4</span>;
        }
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">2</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">2</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">2</span>;
        }
        <span class="kw">if</span> <span class="ident">f</span> <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">f</span> <span class="op">&lt;&lt;=</span> <span class="number">1</span>;
            <span class="ident">e</span> <span class="op">-=</span> <span class="number">1</span>;
        }
        <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">f</span> <span class="op">&gt;=</span> (<span class="number">1</span> <span class="op">&gt;&gt;</span> <span class="number">63</span>));
        <span class="ident">Fp</span> { <span class="ident">f</span>, <span class="ident">e</span> }
    }

    <span class="doccomment">/// Normalizes itself to have the shared exponent.</span>
    <span class="doccomment">/// It can only decrease the exponent (and thus increase the mantissa).</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">normalize_to</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">e</span>: <span class="ident">i16</span>) <span class="op">-&gt;</span> <span class="ident">Fp</span> {
        <span class="kw">let</span> <span class="ident">edelta</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">e</span> <span class="op">-</span> <span class="ident">e</span>;
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">edelta</span> <span class="op">&gt;=</span> <span class="number">0</span>);
        <span class="kw">let</span> <span class="ident">edelta</span> <span class="op">=</span> <span class="ident">edelta</span> <span class="kw">as</span> <span class="ident">usize</span>;
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">f</span> <span class="op">&lt;&lt;</span> <span class="ident">edelta</span> <span class="op">&gt;&gt;</span> <span class="ident">edelta</span>, <span class="self">self</span>.<span class="ident">f</span>);
        <span class="ident">Fp</span> {
            <span class="ident">f</span>: <span class="self">self</span>.<span class="ident">f</span> <span class="op">&lt;&lt;</span> <span class="ident">edelta</span>,
            <span class="ident">e</span>,
        }
    }
}
</pre></div>
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