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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - In GetVectorElementPointer - EltSize assertions fail if getSizeInBits is less than 8"
href="https://llvm.org/bugs/show_bug.cgi?id=29018">29018</a>
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<th>Summary</th>
<td>In GetVectorElementPointer - EltSize assertions fail if getSizeInBits is less than 8
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvmbugs@endgame.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The code at lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:1031 seems to have
issues if the element size is less than a full byte (e.g., processing a "i1"),
as EltSize will truncate to 0 and then the assertion will fail. Allowing the
assertion to be ignored if EltSize == 0 seems to fix this issue, but it looks
like something that needs more review:
// Calculate the element offset and add it to the pointer.
unsigned EltSize = EltVT.getSizeInBits() / 8; // FIXME: should be ABI size.
if (EltSize)
{
assert(EltSize * 8 == EltVT.getSizeInBits() &&
"Converting bits to bytes lost precision");
}</pre>
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</p>
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