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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Changing regalloc order breaks "lencod" on native arm linux builds."
href="http://llvm.org/bugs/show_bug.cgi?id=18996">18996</a>
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<th>Summary</th>
<td>Changing regalloc order breaks "lencod" on native arm linux builds.
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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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>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>atrick@apple.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The LNT run of lencod broke here:
<a href="http://lab.llvm.org:8011/builders/clang-native-arm-lnt/builds/5356">http://lab.llvm.org:8011/builders/clang-native-arm-lnt/builds/5356</a>
After this commit:
Author: atrick
Date: Wed Feb 26 16:07:26 2014
New Revision: 202304
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=202304&view=rev">http://llvm.org/viewvc/llvm-project?rev=202304&view=rev</a>
Log:
Add a limit to the heuristic that register allocates instructions in local
order.
This handles pathological cases in which we see 2x increase in spill
code for large blocks (~50k instructions). I don't have a unit test
for this behavior.
Fixes rdar://16072279.
Modified:
llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp
There is a downstream codegen bug that is only exposed by a certain register
allocation order, and only currently reproducible on native arm linux builds.</pre>
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