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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LSR] Assert in InsertFormula"
href="https://bugs.llvm.org/show_bug.cgi?id=43480">43480</a>
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<th>Summary</th>
<td>[LSR] Assert in InsertFormula
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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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>sjoerd.meijer@arm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22590" name="attach_22590" title="reproducer">attachment 22590</a> <a href="attachment.cgi?id=22590&action=edit" title="reproducer">[details]</a></span>
reproducer
LSR is running in this assert:
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp:3372: bool
{anonymous}::LSRInstance::InsertFormula({anonymous}::LSRUse&, unsigned int,
const {anonymous}::Formula&): Assertion `isLegalUse(TTI, LU.MinOffset,
LU.MaxOffset, LU.Kind, LU.AccessTy, F) && "Formula is illegal"' failed.
Stack dump:
0. Program arguments: /data/monorepo/llvm-project/build/bin/llc sjoerd.ll
1. Running pass 'Function Pass Manager' on module 'sjoerd.ll'.
2. Running pass 'Loop Pass Manager' on function '@fn1'
3. Running pass 'Loop Strength Reduction' on basic block '%for.cond'
Running llc on the attached .ll file is enough to reproduce this.
Just for completeness, this .ll file corresponds to this creduced input file:
__fp16 *a;
void fn1() {
for (int i; ; i++)
foo(a[i]);
}</pre>
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