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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -verify-scev is causing hang or just taking forever"
href="https://bugs.llvm.org/show_bug.cgi?id=33387">33387</a>
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<th>Summary</th>
<td>-verify-scev is causing hang or just taking forever
</td>
</tr>
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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>
</tr>
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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>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18604" name="attach_18604" title="test case">attachment 18604</a> <a href="attachment.cgi?id=18604&action=edit" title="test case">[details]</a></span>
test case
(Csmith)
This test case takes a second to compile with clang, but with -mllvm
-verify-scev, it does not seem to terminate after even an hour...
It seems that GlobalsModRef.cpp is recursing very heavily in
Constant::isConstantUsed().
When I try this->dump() on the Constant, the dumping never ends, so this seems
to be either crazy or something that the algorithm should guard against.
bin/clang -cc1 -triple s390x-ibm-linux -S -target-cpu z13 -O3 -vectorize-loops
-vectorize-slp -o /dev/null -x ir ~/build-dev/test4.bc -mllvm -verify-scev</pre>
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