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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "error in backend: unknown codeview register" while compiling optimized AVX-512 code"
href="https://bugs.llvm.org/show_bug.cgi?id=35306">35306</a>
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<th>Summary</th>
<td>"error in backend: unknown codeview register" while compiling optimized AVX-512 code
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>filip.strugar@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Using llvm/clang 5.0, pre-built 64bit binaries with VS2017
The AVX-512 code (-mavx512f -mavx512bw -mavx512dq) compiles in debug but in
release/optimized build dumps out the following error:
1>CL : fatal error : error in backend: unknown codeview register
1>clang-cl.exe : error : clang frontend command failed with exit code 70 (use
-v to see invocation)
1>clang version 5.0.0 (tags/RELEASE_500/final)
1>Target: x86_64-pc-windows-msvc
1>Thread model: posix
1>InstalledDir: C:\Program Files\LLVM\msbuild-bin
1>clang-cl.exe: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
1>clang-cl.exe: note: diagnostic msg:
1>********************
1>
1>PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
1>Preprocessed source(s) and associated run script(s) are located at:
1>clang-cl.exe: note: diagnostic msg:
C:\Users\fstrugar\AppData\Local\Temp\MaskedOcclusionCullingAVX512-18da46.cpp
1>clang-cl.exe: note: diagnostic msg:
C:\Users\fstrugar\AppData\Local\Temp\MaskedOcclusionCullingAVX512-18da46.sh
1>clang-cl.exe: note: diagnostic msg:
1>
1>********************
The codebase in question is available publicly at
<a href="https://github.com/GameTechDev/MaskedOcclusionCulling">https://github.com/GameTechDev/MaskedOcclusionCulling</a> - the only modification
needed to trigger the compilation bug is to set USE_AVX512 to 1 in
<a href="https://github.com/GameTechDev/MaskedOcclusionCulling/blob/master/MaskedOcclusionCulling.h#L78">https://github.com/GameTechDev/MaskedOcclusionCulling/blob/master/MaskedOcclusionCulling.h#L78</a>
and compile the Release_LLVM configuration.</pre>
</div>
</p>
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