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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion `(LocalChanged || (RefHash == StructuralHash(F))) && "Pass modifies its input and doesn't report it."' for -loop-idiom pass"
href="https://bugs.llvm.org/show_bug.cgi?id=46745">46745</a>
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<th>Summary</th>
<td>Assertion `(LocalChanged || (RefHash == StructuralHash(F))) && "Pass modifies its input and doesn't report it."' for -loop-idiom pass
</td>
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<th>Product</th>
<td>new-bugs
</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>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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.stenberg@ericsson.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, sguelton@redhat.com
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</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23728" name="attach_23728" title="IR reproducer.">attachment 23728</a> <a href="attachment.cgi?id=23728&action=edit" title="IR reproducer.">[details]</a></span>
IR reproducer.
LLVM commit: 274332282cb4ce167de8e73fb9c59d2eecd67c25
Requires an expensive checks build to reproduce.
$ opt -loop-idiom -disable-basic-aa -S loop-idiom.ll
opt: ../lib/IR/LegacyPassManager.cpp:1591: bool
llvm::FPPassManager::runOnFunction(llvm::Function &): Assertion `(LocalChanged
|| (RefHash == StructuralHash(F))) && "Pass modifies its input and doesn't
report it."' failed.
After some very shallow troubleshooting, the issue seems to be that we return
false in this case:
if (mayLoopAccessLocation(BasePtr, ModRefInfo::ModRef, CurLoop, BECount,
StoreSize, *AA, Stores)) {
Expander.clear();
// If we generated new code for the base pointer, clean up.
RecursivelyDeleteTriviallyDeadInstructions(BasePtr, TLI);
return false;
}</pre>
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