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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LICM takes forever (100+ seconds) on a small testcase with large number of loads/stores per block"
href="https://llvm.org/bugs/show_bug.cgi?id=28832">28832</a>
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<th>Summary</th>
<td>LICM takes forever (100+ seconds) on a small testcase with large number of loads/stores per block
</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>All
</td>
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<th>Status</th>
<td>NEW
</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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</tr>
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<th>Reporter</th>
<td>dberlin@dberlin.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16871" name="attach_16871" title="Small version of testcase">attachment 16871</a> <a href="attachment.cgi?id=16871&action=edit" title="Small version of testcase">[details]</a></span>
Small version of testcase
This is the same testcase as PR28670.
I've attached the small version.
On my mac, LICM takes >100 seconds, all of it being spent in the
aliassettracker, doing merges and alias calls:
52.1751 ( 48.2%) 0.5258 ( 47.6%) 52.7009 ( 48.2%) 53.0047 ( 48.2%) Loop
Invariant Code Motion
20.9636 ( 19.4%) 0.2059 ( 18.6%) 21.1694 ( 19.4%) 21.2563 ( 19.3%) Loop
Invariant Code Motion
17.6664 ( 16.3%) 0.1026 ( 9.3%) 17.7690 ( 16.2%) 17.8337 ( 16.2%) Loop
Invariant Code Motion
On the larger version of this testcase, it's even worse.</pre>
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