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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Code generation error with -m32 -fPIC"
href="https://bugs.llvm.org/show_bug.cgi?id=46527">46527</a>
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<th>Summary</th>
<td>Code generation error with -m32 -fPIC
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</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
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>jjorge@quarkslab.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23663" name="attach_23663" title="Reduced test case.">attachment 23663</a> <a href="attachment.cgi?id=23663&action=edit" title="Reduced test case.">[details]</a></span>
Reduced test case.
Compiling the attached IR code with the command `clang -m32 -fPIC -c
test-small.ll` produces the following error:
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:4524: virtual void (anonymous
namespace)::X86DAGToDAGISel::Select(llvm::SDNode *): Assertion
`Subtarget->hasSSE41() && "Expected SSE4.1 support!"' failed.
See attached file clang-10-output.log for the full message.
Clang is built from the release/10.x branch.
In my experiments I observed the following:
- the same error occurs with Clang from the release/9.x branch, see the
attached file clang-9-output.log for the output.
- omitting either -fPIC or -m32 prevents the errors.
- there is no error with Clang 10 as provided by Ubuntu 20.04 unless I add
-msse2 or -msse3. See the attached file clang-10-ubuntu-output.log for the full
message. In this case the error is:
error in backend: Cannot select: 0x13cb528: v16i8 = X86ISD::BLENDV
0x13cb250, 0x13c43f0, 0x13cb0b</pre>
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