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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertio n `isLoopInvariant(Operands[i], L) && "SCEVAddRecExpr operand is not loop-invariant!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=47776">47776</a>
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<th>Summary</th>
<td>Assertio n `isLoopInvariant(Operands[i], L) && "SCEVAddRecExpr operand is not loop-invariant!"' failed.
</td>
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<th>Product</th>
<td>new-bugs
</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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>max.kazantsev@azul.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24038" name="attach_24038" title="test.ll">attachment 24038</a> <a href="attachment.cgi?id=24038&action=edit" title="test.ll">[details]</a></span>
test.ll
Download test.ll, run `opt -loop-reduce -S`. SCEV fails an sssertio
n `isLoopInvariant(Operands[i], L) && "SCEVAddRecExpr operand is not
loop-invariant!"' failed.
This happens inside applyLoopGuards function.
The guilty change is:
commit d4ddf63fc40cfbbc348adcc45cdc6f6d78268c5c
Author: Florian Hahn <<a href="mailto:flo@fhahn.com">flo@fhahn.com</a>>
Date: Thu Sep 24 11:06:55 2020 +0100
[SCEV] Use loop guard info when computing the max BE taken count in
howFarToZero.
For some expressions, we can use information from loop guards when
we are looking for a maximum. This patch applies information from
loop guards to the expression used to compute the maximum backedge
taken count in howFarToZero. It currently replaces an unknown
expression X with UMin(X, Y), if the loop is guarded by
X ult Y.
This patch is minimal in what conditions it applies, and there
are a few TODOs to generalize.
This partly addresses PR40961. We will also need an update to
LV to address it completely.
Reviewed By: reames
Differential Revision: <a href="https://reviews.llvm.org/D67178">https://reviews.llvm.org/D67178</a></pre>
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