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<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>
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<th>Summary</th>
<td>missing optimization
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<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>
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</p>
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