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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 - Unprofitable target specific vectorization"
   href="https://bugs.llvm.org/show_bug.cgi?id=41188">41188</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unprofitable target specific vectorization
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Linux
          </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>Backend: X86
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>david.bolvansky@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I checked this "benchmark": <a href="https://godbolt.org/z/IrAj-o">https://godbolt.org/z/IrAj-o</a>

-O3 on haswell X86-64, 4720HQ - cca 1.9s
-O3 -mtune=native -march=native - cca 2.1s


Seems like we have a regression there too. Just looking at the godbolt results,
the slower code contains a vectorized code, standard -O3 avoids vectorization.

Maybe cost model issue for Haswell ?</pre>
        </div>
      </p>


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