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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Function replaceCongruentIVs can crash if incoming phi value is a global variable"
href="https://llvm.org/bugs/show_bug.cgi?id=26574">26574</a>
</td>
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<th>Summary</th>
<td>Function replaceCongruentIVs can crash if incoming phi value is a global variable
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mattias.v.eriksson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</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=15882" name="attach_15882" title="Reduced input file with crash in indvars">attachment 15882</a> <a href="attachment.cgi?id=15882&action=edit" title="Reduced input file with crash in indvars">[details]</a></span>
Reduced input file with crash in indvars
I found this crash in one of our internal test suites and reduced it to the
attached repr.ll.
opt -S -indvars repr.ll
crashes like this:
opt: ../include/llvm/Support/Casting.h:237: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = llvm::Instruction, Y = llvm::Value]:
Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Called from this line in ScalarEvolutionExpander.cpp:
Instruction *OrigInc =
cast<Instruction>(OrigPhiRef->getIncomingValueForBlock(LatchBlock));
(gdb) p OrigPhiRef->dump()
%_tmp19 = phi i16** [ @pglob, %bb_lslct36 ], [ %_tmp196, %bb2 ]
pglob is a "external global i16*" here.</pre>
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