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<h1>fibonacci_hash
<small>Function</small>
</h1>
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<h2>public elemental function fibonacci_hash(key, nbits) result(sample)
</h2>
<p>Maps the 32 bit integer <code>key</code> to an unsigned integer value with only <code>nbits</code>
bits where <code>nbits</code> is less than 32
(<a href="../page/specs/stdlib_hash_procedures.html#fibonacci_hash-maps-an-integer-to-a-smaller-number-of-bits">Specification</a>)</p>
<h3>Arguments</h3>
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<span class="anchor" id="variable-key~164"></span>
integer(kind=int32),
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<td>intent(in)</td>
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<td><strong>key</strong></td>
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integer(kind=int32)
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<section>
<h2><span class="anchor" id="src"></span>Source Code</h2>
<div class="hl codehilite"><pre><span></span><span class="w"> </span><span class="k">elemental function </span><span class="n">fibonacci_hash</span><span class="p">(</span><span class="w"> </span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="n">nbits</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="p">)</span>
<span class="c">!! Version: experimental</span>
<span class="c">!!</span>
<span class="c">!! Maps the 32 bit integer `key` to an unsigned integer value with only `nbits`</span>
<span class="c">!! bits where `nbits` is less than 32</span>
<span class="c">!! ([Specification](../page/specs/stdlib_hash_procedures.html#fibonacci_hash-maps-an-integer-to-a-smaller-number-of-bits))</span>
<span class="w"> </span><span class="kt">integer</span><span class="p">(</span><span class="n">int32</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">key</span>
<span class="w"> </span><span class="kt">integer</span><span class="p">,</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">nbits</span>
<span class="w"> </span><span class="kt">integer</span><span class="p">(</span><span class="n">int32</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sample</span>
<span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">ishft</span><span class="p">(</span><span class="w"> </span><span class="n">key</span><span class="o">*</span><span class="n">pow32_over_phi</span><span class="p">,</span><span class="w"> </span><span class="o">-</span><span class="mi">32</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">nbits</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="k">end function </span><span class="n">fibonacci_hash</span>
</pre></div>
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