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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "opt -enable-loop-distribute -loop-distribute" failing with "PHINode should have one entry for each predecessor of its parent basic block!""
href="https://bugs.llvm.org/show_bug.cgi?id=49379">49379</a>
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<th>Summary</th>
<td>"opt -enable-loop-distribute -loop-distribute" failing with "PHINode should have one entry for each predecessor of its parent basic block!"
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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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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<th>Reporter</th>
<td>mikael.holmen@ericsson.com
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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=24578" name="attach_24578" title="bbi-53389.ll">attachment 24578</a> <a href="attachment.cgi?id=24578&action=edit" title="bbi-53389.ll">[details]</a></span>
bbi-53389.ll
llvm commit 7b319df29bf
Reproduce with:
opt -enable-loop-distribute -loop-distribute -S -o - bbi-53389.ll
Result:
PHINode should have one entry for each predecessor of its parent basic block!
%1 = phi i16 [ undef, %for.end.lver.orig ], [ 0, %cleanup4.loopexit ]
LLVM ERROR: Broken module found, compilation aborted!
The offending basic block looks like:
cleanup4.lver.orig: ; preds = %for.end.lver.orig
%1 = phi i16 [ undef, %for.end.lver.orig ], [ 0, %cleanup4.loopexit ]
br i1 false, label %lbl1.lver.orig, label %return.us-lcssa.loopexit
and there is no branch from %cleanup4.loopexit to cleanup4.lver.orig.
cleanup4.loopexit looks like:
cleanup4.loopexit: ; No predecessors!
br label %cleanup4
There are blocks in the input that are unreachable from entry. I suppose that
confuses loop-distribute.</pre>
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