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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - RegionInfo is not updated correctly in polly-prepare"
href="https://bugs.llvm.org/show_bug.cgi?id=33876">33876</a>
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<th>Summary</th>
<td>RegionInfo is not updated correctly in polly-prepare
</td>
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<th>Product</th>
<td>Polly
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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>Other
</td>
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
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<th>Reporter</th>
<td>philip.pfaffe@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18829" name="attach_18829" title="Lit testcase">attachment 18829</a> <a href="attachment.cgi?id=18829&action=edit" title="Lit testcase">[details]</a></span>
Lit testcase
In polly-prepare we split the entry block of a function, and subsequently
update and preserved a precomputed RegionInfo, if it exists. The attached
testcase demonstrates this. If -region is run after -polly-prepare, the
resulting region tree looks like this:
[0] entry => <Function Return>
[1] entry.split => for.end
[2] for.cond => for.end
If -region is run before, the region tree is this:
[0] entry => <Function Return>
[1] entry => for.end
[2] for.cond => for.end
This is the correct tree before the split, but it is not correct after. The
expected result should be the same as above. If -region runs before the
CodePreparation pass, the CodePreparation pass will try to update it.
- Philip</pre>
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</p>
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