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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVX-512] Compiler crash: Cannot select: t41: v8i64 = X86ISD::SUBV_BROADCAST"
href="https://llvm.org/bugs/show_bug.cgi?id=31306">31306</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[AVX-512] Compiler crash: Cannot select: t41: v8i64 = X86ISD::SUBV_BROADCAST
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>babokin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, Vsevolod.Livinskij@frtk.ru
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17732" name="attach_17732" title="reproducer">attachment 17732</a> <a href="attachment.cgi?id=17732&action=edit" title="reproducer">[details]</a></span>
reproducer
This is recently introduced bug in trunk. It's reproduced with skx and knl
targets.
<span class="quote">> clang++ -c -O2 -march=skx subv_broadcast.cpp</span >
fatal error: error in backend: Cannot select: t41: v8i64 =
X86ISD::SUBV_BROADCAST t40
t40: v4i64,ch = load<LD32[ConstantPool]> t0, t49, undef:i64
t49: i64 = X86ISD::Wrapper TargetConstantPool:i64<<4 x i64> <i64 -4096, i64
-1099511627776, i64 -4294967296, i64 -8589934592>> 0
t48: i64 = TargetConstantPool<<4 x i64> <i64 -4096, i64 -1099511627776,
i64 -4294967296, i64 -8589934592>> 0
t3: i64 = undef
In function: _Z1ov
clang-4.0: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 4.0.0 (trunk 288907)
Target: x86_64-unknown-linux-gnu</pre>
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