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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AssumeBundles bad interaction with SROA"
href="https://bugs.llvm.org/show_bug.cgi?id=46753">46753</a>
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<th>Summary</th>
<td>AssumeBundles bad interaction with SROA
</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>release blocker
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>xur@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23737" name="attach_23737" title="test case">attachment 23737</a> <a href="attachment.cgi?id=23737&action=edit" title="test case">[details]</a></span>
test case
The recently change on alignment assumption generated very inefficient codes --
it seems SROA cannot handle the patten in the new implementation and fail to do
the cleanup.
Some of our internal tests suffer 10x slow down.
The attached program shows the problem. Without the patch, we have 6
instructions. With the patch, we have ~100 instructions, most of them are
redundant.</pre>
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