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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Missed optimization opportunity: replacing logical or with bitwise."
   href="https://bugs.llvm.org/show_bug.cgi?id=37747">37747</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Missed optimization opportunity: replacing logical or with bitwise.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>denis.yaroshevskij@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>std::accumulate(,,,std::bit_or{}) is much faster than
std::accumulate(,,,std::logical_or{}) even though they have the same semantics.

Since there is no branching on the result of the or in accumulate, the compiler
could substitute logical for the bit one. 

QuickBench: <a href="http://quick-bench.com/OhizrjUK_8KaF3qa4Bv4LzjEXy8">http://quick-bench.com/OhizrjUK_8KaF3qa4Bv4LzjEXy8</a></pre>
        </div>
      </p>


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