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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_RESOLVED  bz_closed"
   title="RESOLVED INVALID - 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>---
           </td>
           <td>INVALID
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>REOPENED
           </td>
           <td>RESOLVED
           </td>
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        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Missing optimization for member function with const attribute"
   href="https://bugs.llvm.org/show_bug.cgi?id=50735#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - 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>thanks, you are right, I verify with following change as you show, it indeed
can modify 'bins[0]'


class NPair /*: protected Pointers */ {
public:
  int bins[10];
  //int exclusion(int n) __attribute__((const));
  int exclusion (int n) const {
        printf ("before %d\n", bins[0]);
    NPair* pt = const_cast<NPair*>(this);
    pt->bins[0] = 1;
        printf ("after %d\n", bins[0]);
  }
  NPair (void) {
     bins[0] = 3;
  }
};</pre>
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