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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - CodeGen crash with "Queue is empty!" on lshr i256 instruction"
href="http://llvm.org/bugs/show_bug.cgi?id=22304">22304</a>
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<th>Summary</th>
<td>CodeGen crash with "Queue is empty!" on lshr i256 instruction
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chfast@gmail.com
</td>
</tr>
<tr>
<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=13724" name="attach_13724" title="CodeGen test">attachment 13724</a> <a href="attachment.cgi?id=13724&action=edit" title="CodeGen test">[details]</a></span>
CodeGen test
Assertion failed: !Queue.empty() && "Queue is empty!", file
llvm\lib\CodeGen\SelectionDAG\ScheduleDAGRRList.cpp, line 1701
Stack dump:
0. Program arguments:
h:\Sources\libs\build\llvm-3.5.0-x64\Debug\bin\llc.exe
bugpoint-reduced-simplified.ll
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2. Running pass 'X86 DAG->DAG Instruction Selection' on function
'@lshr_codegen_bug_queue_is_empty'
It happens on Windows and Linux, LLVM 3.5.0. I will check current trunk.
I used bugpoint to reduce the test. I'm pretty sure the point of failure is
lshr i256 instruction because I reimplemented my algorithm without it and it
worked.</pre>
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