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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LICM spends large part of its time computing Alias info"
href="https://llvm.org/bugs/show_bug.cgi?id=31883">31883</a>
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<th>Summary</th>
<td>LICM spends large part of its time computing Alias info
</td>
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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>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Keywords</th>
<td>slow-compile
</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>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
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<th>CC</th>
<td>dberlin@dberlin.org, llvm-bugs@lists.llvm.org, simon.f.whittaker@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17942" name="attach_17942" title="LTO profile">attachment 17942</a> <a href="attachment.cgi?id=17942&action=edit" title="LTO profile">[details]</a></span>
LTO profile
LICM seems to spend 90-95% of its time in AST, which is terribly O(N^2).
This slowness is exacerbated on large files or at LTO time.
See attachment.</pre>
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