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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -passes='loop-bound-split' failing with "PHINode should have one entry for each predecessor of its parent basic block!""
href="https://bugs.llvm.org/show_bug.cgi?id=51700">51700</a>
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<th>Summary</th>
<td>opt -passes='loop-bound-split' failing with "PHINode should have one entry for each predecessor of its parent basic block!"
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<th>Product</th>
<td>libraries
</td>
</tr>
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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>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>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=25210" name="attach_25210" title="bbi-59713.ll reproducer">attachment 25210</a> <a href="attachment.cgi?id=25210&action=edit" title="bbi-59713.ll reproducer">[details]</a></span>
bbi-59713.ll reproducer
llvm commit: d396d09fc2278bfe34b9db2ee27ecfd470149da8
Reproduce with:
opt -passes='loop-bound-split' -S -o - bbi-59713.ll
Result:
PHINode should have one entry for each predecessor of its parent basic block!
%call.lcssa.ph = phi i16
PHI node entries do not match predecessors!
%call.lcssa = phi i16 [ %call, %cond.end ], [ %call.lcssa.ph, %end.loopexit ]
label %cond.end
label %entry.split.split
LLVM ERROR: Broken module found, compilation aborted!
Looking att -print-after-all we see that loop-bound-split has created this
broken phi instruction:
end.loopexit: ; preds = %cond.end.split
%call.lcssa.ph = phi i16
Note:
If we add e.g. -verify-each we actually get less information, because then we
only get
LLVM ERROR: Broken module found, compilation aborted!
and not the error message about the broken PHI.
It was also a mess reducing the input because bugpoint kept crashing.</pre>
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