<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </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 --- - missing optimization"
   href="https://llvm.org/bugs/show_bug.cgi?id=27972">27972</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>missing optimization
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lld
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

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

        <tr>
          <th>Reporter</th>
          <td>rafael.espindola@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Reporting just for completeness, it is not clear if this is worth it.

Given

call foo@plt
call *foo@gotpcrel(%rip)

we know that there will be a non lazy reference to foo. Given that, we could
avoid the .got.plt entry and produce a non lazy plt that just uses the regular
got entry.

The reason I am not sure this is useful is that I don't expect it to show up a
lot. It would show up if mixing -fno-plt and -fplt code, but that is probably
not common.

The other case it would show up is something like

void f(void);
void *g(void) {return f; }

which is probably also not common.

I think this is the only missing optimization that is documented in the x86_64
abi.</pre>
        </div>
      </p>
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