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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LoopVectorizer] getInstructionCost() triggers assert"
href="https://bugs.llvm.org/show_bug.cgi?id=48321">48321</a>
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<th>Summary</th>
<td>[LoopVectorizer] getInstructionCost() triggers assert
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<th>Product</th>
<td>libraries
</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>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=24216" name="attach_24216" title="reduced testcase">attachment 24216</a> <a href="attachment.cgi?id=24216&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
LoopVectorizationCostModel::getInstructionCost is passed a trunc instruction:
%i11.i = trunc i40 %i10.i to i32
RetTy is first i32, but after
if (canTruncateToMinimalBitwidth(I, VF))
RetTy = IntegerType::get(RetTy->getContext(), MinBWs[I]);
it is set to i1, which seems broken?
SystemZTTIImpl::getCastInstrCost() is then called:
(gdb) p Dst->dump()
<2 x i32>
$49 = void
(gdb) p Src->dump()
<2 x i1>
which triggers an assert since this would be a cost of truncating i1 vector to
i32 vector, which doesn't make sense...
./bin/opt -mcpu=z14 tc_sztti.ll -o a.out -O2</pre>
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