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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Crash in llvm::MachineTraceMetrics::Ensemble::computeCrossBlockCriticalPath" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24199&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=g327IhSW_7xamkDRjHPZHy8pWUMw226WqfYdAF6xVtU&s=xaiirIKz4jDc4xQfqVV8wpv6zxzS3KCMAH-w-CMaFZg&e=">24199</a>
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<th>Summary</th>
<td>Crash in llvm::MachineTraceMetrics::Ensemble::computeCrossBlockCriticalPath
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rob.lougher@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14622" name="attach_14622" title="Test case">attachment 14622</a> <a href="attachment.cgi?id=14622&action=edit" title="Test case">[details]</a></span>
Test case
The attached reduced test case (test.cpp) causes a crash in
llvm::MachineTraceMetrics::Ensemble::computeCrossBlockCriticalPath.
Compile with:
clang test.cpp -c -ffast-math -O3 -g
Stack trace attached.
Manually bisecting indicates that it started with r241515:
--------------------
[x86] extend machine combiner reassociation optimization to SSE scalar adds
Extend the reassociation optimization of <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__reviews.llvm.org_rL240361&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=g327IhSW_7xamkDRjHPZHy8pWUMw226WqfYdAF6xVtU&s=o0NYYko9Tjp64dsTILE-_u769_89-TMVtHUyNnexTo8&e=">http://reviews.llvm.org/rL240361</a>
(D10460)
to SSE scalar FP SP adds in addition to AVX scalar FP SP adds.
With the 'switch' in place, we can trivially add other opcodes and test cases
in
future patches.
Differential Revision: <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__reviews.llvm.org_D10975&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=g327IhSW_7xamkDRjHPZHy8pWUMw226WqfYdAF6xVtU&s=t9AcD7F1QRunRy6YRDqZCH3qKrI_riz_Bhpz9aBxpRA&e=">http://reviews.llvm.org/D10975</a>
--------------------</pre>
</div>
</p>
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