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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 - update_llc_test_checks.py doesn't report when a common prefix has been lost"
   href="https://bugs.llvm.org/show_bug.cgi?id=49189">49189</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>update_llc_test_checks.py doesn't report when a common prefix has been lost
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>tools
          </td>
        </tr>

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

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

        <tr>
          <th>OS</th>
          <td>Windows NT
          </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>support scripts
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>llvm-dev@redking.me.uk
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>greg.bedwell@sony.com, i@maskray.me, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://reviews.llvm.org/rGf32dc6bb42fd24517289fd1e3418994daa4fec20">https://reviews.llvm.org/rGf32dc6bb42fd24517289fd1e3418994daa4fec20</a>

; RUN: llc < %s -mtriple=x86_64-- -mattr=+avx2 | FileCheck %s
--check-prefixes=AVX,AVX2
; RUN: llc < %s -mtriple=x86_64-- -mattr=+avx2,+fast-variable-shuffle |
FileCheck %s --check-prefixes=AVX,AVX2

update_llc_test_checks.py didn't report that two AVX2 runs had conflicting
checks for all their common prefixes, which meant we lost ALL test coverage.</pre>
        </div>
      </p>


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