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      <base href="https://bugs.llvm.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [X86] IR execution test fails with -O0 opt-level on haswell"
   href="https://bugs.llvm.org/show_bug.cgi?id=34592">34592</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[X86] IR execution test fails with -O0 opt-level on haswell
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

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

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

        <tr>
          <th>Severity</th>
          <td>normal
          </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>ayman.musa@intel.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=19154" name="attach_19154" title="execution test that fails">attachment 19154</a> <a href="attachment.cgi?id=19154&action=edit" title="execution test that fails">[details]</a></span>
execution test that fails

Attached is an IR execution test including a chain of shufflevector and select
instructions.

The test fails when compiling with "-O0 -march=haswell" flags.

Run the following on a haswell machine to reproduce:

<span class="quote">> clang -O0 -march=haswell exec_test_fail.ll -o exec_test_fail.exe
> ./exec_test_fail.exe</span >
===============================================================================

<span class="quote">> FAIL: lane 2, expected 153, found 0</span ></pre>
        </div>
      </p>


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