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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVX512]: fatal error: error in backend: Cannot select: 0x7fbc0022a050"
href="https://llvm.org/bugs/show_bug.cgi?id=28974">28974</a>
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<th>Summary</th>
<td>[AVX512]: fatal error: error in backend: Cannot select: 0x7fbc0022a050
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>wenzel.jakob@epfl.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16946" name="attach_16946" title="CPP file causing the crash">attachment 16946</a> <a href="attachment.cgi?id=16946&action=edit" title="CPP file causing the crash">[details]</a></span>
CPP file causing the crash
I've run into the attached codegen crash with Clang trunk.
fatal error: error in backend: Cannot select: 0x7fbc0022a050: v4i1 =
BUILD_VECTOR TargetConstant:i1<0>, TargetConstant:i1<0>, TargetConstant:i1<0>,
TargetConstant:i1<0>
0x7fbc00229f00: i1 = TargetConstant<0>
0x7fbc00229f00: i1 = TargetConstant<0>
0x7fbc00229f00: i1 = TargetConstant<0>
0x7fbc00229f00: i1 = TargetConstant<0>
In function: _Z7runTestIN4simd5ArrayIdLm4ELb0ELNS0_12RoundingModeE4EEEEvv
clang-4.0: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 4.0.0 (trunk 277963)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Users/wenzel/llvm/build/bin
clang-4.0: 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.
clang-4.0: note: diagnostic msg:
It is likely related to usage of the AVX512VL intrinsics
_mm256_cmp_epi64_mask, _mm256_mask_i64scatter_epi64, and
_mm256_mask_i64scatter_pd
(no crash occurs when these functions are not called).</pre>
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