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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LoopDeletion] Infinite loop removed without mustprogress"
href="https://bugs.llvm.org/show_bug.cgi?id=50511">50511</a>
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<th>Summary</th>
<td>[LoopDeletion] Infinite loop removed without mustprogress
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>nikita.ppv@gmail.com
</td>
</tr>
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<th>CC</th>
<td>jdoerfert@anl.gov, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>define void @test(i1 %c1, i1 %c2) {
br label %loop1
loop1:
br i1 %c1, label %loop1.latch, label %loop2
loop2:
br i1 %c2, label %loop1.latch, label %loop2
loop1.latch:
br i1 false, label %loop1, label %exit
exit:
ret void
}
opt -S -loop-deletion
define void @test(i1 %c1, i1 %c2) {
br label %exit
exit: ; preds = %0
ret void
}
Note that the original code goes into an infinite loop for %c1=false, %c2=false
and the function is not mustprogress.
While LoopDeletion makes sure that the loop has a finite trip count, it does
not account for an inner infinite loop.</pre>
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