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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llc -O1 results in "Unanalyzed node not noticed?", "UNREACHABLE executed at ../lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:482!""
href="https://bugs.llvm.org/show_bug.cgi?id=49393">49393</a>
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<th>Summary</th>
<td>llc -O1 results in "Unanalyzed node not noticed?", "UNREACHABLE executed at ../lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:482!"
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24581" name="attach_24581" title="bbi-53378_x86.ll reproducer">attachment 24581</a> <a href="attachment.cgi?id=24581&action=edit" title="bbi-53378_x86.ll reproducer">[details]</a></span>
bbi-53378_x86.ll reproducer
llvm commit: 4444b343d7e
Reproduce with:
llc -O1 -o - bbi-53378_x86.ll
Result:
Unanalyzed node not noticed?
t25: i16 = fp_to_sint t43
UNREACHABLE executed at ../lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:482!
This seems to start happening with 960cbc53ca:
[DAGCombine] Remove dead node when it is created by getNegatedExpression
We hit the compiling time reported by
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Compile-time explosion in DAGCombiner::Run"
href="show_bug.cgi?id=46877">https://bugs.llvm.org/show_bug.cgi?id=46877</a>
and the reason is the same as D77319. So we need to remove the dead node we
created
to avoid increase the problem size of DAGCombiner.
Reviewed By: Spatel
Differential Revision: <a href="https://reviews.llvm.org/D86183">https://reviews.llvm.org/D86183</a></pre>
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