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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bitcode file with a large flat function takes a long time to compile with llc -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=33320">33320</a>
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<th>Summary</th>
<td>Bitcode file with a large flat function takes a long time to compile with llc -O3
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>4.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>performance
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Register Allocator
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chris.schaf@verizon.net
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>My Common Lisp compiler (github.com/drmeister/clasp) generates a RUN-ALL
function for generating Common Lisp objects at startup. The time it takes
clang to compile this function scales roughly as N^3 where N is the number of
instructions.
Use llc -O3 biglist20000.bc
This builds a 20,000 entry list
It takes more than 2 minutes on my machine.
With 7,000 entries it takes 7 seconds.</pre>
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