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    <body><span class="vcard"><a class="email" href="mailto:zhongyunde@tom.com" title="Allen zhong <zhongyunde@tom.com>"> <span class="fn">Allen zhong</span></a>

</span> changed

          <a class="bz_bug_link 

          bz_status_REOPENED "

   title="REOPENED - Missing optimization for member function with const attribute"

   href="https://bugs.llvm.org/show_bug.cgi?id=50735">bug 50735</a>

          <br>

             <table border="1" cellspacing="0" cellpadding="8">

          <tr>

            <th>What</th>

            <th>Removed</th>

            <th>Added</th>

          </tr>


         <tr>

           <td style="text-align:right;">Resolution</td>

           <td>INVALID

           </td>

           <td>---

           </td>

         </tr>


         <tr>

           <td style="text-align:right;">Status</td>

           <td>RESOLVED

           </td>

           <td>REOPENED

           </td>

         </tr></table>

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        <div>

            <b><a class="bz_bug_link 

          bz_status_REOPENED "

   title="REOPENED - Missing optimization for member function with const attribute"

   href="https://bugs.llvm.org/show_bug.cgi?id=50735#c5">Comment # 5</a>

              on <a class="bz_bug_link 

          bz_status_REOPENED "

   title="REOPENED - Missing optimization for member function with const attribute"

   href="https://bugs.llvm.org/show_bug.cgi?id=50735">bug 50735</a>

              from <span class="vcard"><a class="email" href="mailto:zhongyunde@tom.com" title="Allen zhong <zhongyunde@tom.com>"> <span class="fn">Allen zhong</span></a>

</span></b>

        <pre>I reopen it as it is undefined behavior, see detail in the link


<a href="https://isocpp.org/wiki/faq/const-correctness#mutable-data-members">https://isocpp.org/wiki/faq/const-correctness#mutable-data-members</a>


Please don't write saying version X of compiler Y on machine Z lets you change

a non-mutable member of a const object. I don’t care - it is illegal according

to the language and your code will probably fail on a different compiler or

even a different version (an upgrade) of the same compiler. Just say no. Use

mutable instead. Write code that is guaranteed to work, not code that doesn't

seem to break</pre>

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