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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unreported changes from rewriteLoopExitValues"
href="https://bugs.llvm.org/show_bug.cgi?id=47486">47486</a>
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<th>Summary</th>
<td>Unreported changes from rewriteLoopExitValues
</td>
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<th>Product</th>
<td>libraries
</td>
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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>Windows NT
</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>Transformation Utilities
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>dmajor@mozilla.com
</td>
</tr>
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<th>CC</th>
<td>lebedev.ri@gmail.com, llvm-bugs@lists.llvm.org, sguelton@redhat.com
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23946" name="attach_23946" title="SwitchLoweringUtils.ll">attachment 23946</a> <a href="attachment.cgi?id=23946&action=edit" title="SwitchLoweringUtils.ll">[details]</a></span>
SwitchLoweringUtils.ll
With expensive checks enabled:
$ opt -indvars -S SwitchLoweringUtils.ll
Pass modifies its input and doesn't report it: Induction Variable
Simplification
With some early returns in IndVarSimplify.cpp, I narrowed it down to
rewriteLoopExitValues, but I'm not sure about the specific line.
It's unclear if bugpoint did something bad here: the only predecessor of the
`ret` is the first instruction, so everything in between is an infinite loop. I
can share the original repro if that's better.</pre>
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