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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LoopDataPrefetch] Assertion `L->getLoopPreheader() && "Can't expand add recurrences without a loop preheader!"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=43784">43784</a>
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<tr>
<th>Summary</th>
<td>[LoopDataPrefetch] Assertion `L->getLoopPreheader() && "Can't expand add recurrences without a loop preheader!"' failed
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22713" name="attach_22713" title="reduced testcase">attachment 22713</a> <a href="attachment.cgi?id=22713&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
I tried to compile the calculix benchmark with -min-prefetch-stride=1 and ran
into an assertion:
llc -O3 -mcpu=z14 ./tc_prefstride1.ll -o - -min-prefetch-stride=1
ScalarEvolutionExpander.cpp:1264: llvm::PHINode*
llvm::SCEVExpander::getAddRecExprPHILiterally(const llvm::SCEVAddRecExpr*
, const llvm::Loop*, llvm::Type*, llvm::Type*, llvm::Type*&, bool&): Assertion
`L->getLoopPreheader() && "Can't expand add recurrences without a loop
preheader!"' failed.
...
#24 0x000000000261e346 llvm::SCEVExpander::expandCodeFor(llvm::SCEV const*,
llvm::Type*)
#25 0x0000000002e4d5be (anonymous namespace)::LoopDataPrefetch::run()
...
It seems there currently is no check for isLoopSimplifyForm() or even if the
loop has a preheader in LoopDataPrefetch, and I wonder why that is...</pre>
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