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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clean up dead lifetime markers."
href="http://llvm.org/bugs/show_bug.cgi?id=17790">17790</a>
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<th>Summary</th>
<td>Clean up dead lifetime markers.
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>benny.kra@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>For the test case from <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - extremely slow compilation at -O3 than -O2 (~400 seconds vs. ~0.1 seconds)"
href="show_bug.cgi?id=16474">Bug 16474</a> (where a lot of inlining occurs) we end up
with a ridiculous amount of dead lifetime markers. The call to
llvm.lifetime.start is directly followed by a llvm.lifetime.end call, repeated
many times.
$ clang -O3 -S -o - t.c -flto | grep -c lifetime
9094
Some pass should probably collapse them.</pre>
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</p>
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