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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 - [InstCombine?] Failure to simplify branch-less logic code"
   href="https://bugs.llvm.org/show_bug.cgi?id=43199">43199</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[InstCombine?] Failure to simplify branch-less logic code
          </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>Scalar Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>lebedev.ri@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://godbolt.org/z/MVN3j">https://godbolt.org/z/MVN3j</a>-
<a href="https://rise4fun.com/Alive/UCaS">https://rise4fun.com/Alive/UCaS</a>

bool is_not_ub_naive(char *Base, unsigned long Offset, char *&Offseted) {
    Offseted = reinterpret_cast<char*>(intptr_t(Base) + Offset);

    return ((Base != nullptr     || Offset == 0) &&
            (Offseted != nullptr || Offset == 0));
}

bool is_not_ub_best(char *Base, unsigned long Offset, char *&Offseted) {
    Offseted = reinterpret_cast<char*>(intptr_t(Base) + Offset);

    return ((Base != nullptr) == (Offseted != nullptr));
}

`is_not_ub_naive()` doesn't get flattened but that isn't the point here.
Even if i flatten it manually down to `@is_not_ub_flat_naive`, it still
doesn't get optimized down to `@is_not_ub_best`...</pre>
        </div>
      </p>


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