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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - TypeBasedAliasAnalysis::PathAliases crashes when processing 'distinct' MDNode"
href="http://llvm.org/bugs/show_bug.cgi?id=22180">22180</a>
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<th>Summary</th>
<td>TypeBasedAliasAnalysis::PathAliases crashes when processing 'distinct' MDNode
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>llc
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>apazos@codeaurora.org
</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>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13659" name="attach_13659" title="reduced test case">attachment 13659</a> <a href="attachment.cgi?id=13659&action=edit" title="reduced test case">[details]</a></span>
reduced test case
Find attached a bugpoint reduced test case for the issue.
TypeBasedAliasAnalysis::PathAliases at line 409 assumes the MD node has offset
fields which are constants, so it crashes when it processes a node like !9:
!9 = distinct !{!9, !10, !11}
!10 = !{!"llvm.loop.vectorize.width", i32 1}
!11 = !{!"llvm.loop.interleave.count", i32 1}
How to reproduce:
llc -O3 test.ll
llc: ../include/llvm/Support/Casting.h:223: typename std::enable_if<(!
llvm::is_simple_type<Y>::value), typename llvm::cast_retty<X, const
Y>::ret_type>::type llvm::cast(const Y&) [with X = llvm::ConstantAsMetadata; Y
= llvm::MDOperand; typename std::enable_if<(! llvm::is_simple_type<Y>::value),
typename llvm::cast_retty<X, const Y>::ret_type>::type =
llvm::ConstantAsMetadata*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of
incompatible type!"' failed.</pre>
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