 k) | (x &gt;&gt; (64-k));</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  }</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> fastrightshiftk(uint64_t&amp; x) {</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    x = (x &gt;&gt; k) | (x &lt;&lt; 