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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - AVX512 fails to select CMP of i1."
href="https://llvm.org/bugs/show_bug.cgi?id=30249">30249</a>
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</tr>
<tr>
<th>Summary</th>
<td>AVX512 fails to select CMP of i1.
</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>
<tr>
<th>OS</th>
<td>Linux
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mkuper@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>define i64 @foo() {
%v = select i1 undef, i64 1, i64 2
ret i64 %v
}
bin/llc ~/llvm/temp/i1512.ll -mattr=+avx512f -mattr=+avx2
SelectionDAG has 11 nodes:
t0: ch = EntryToken
t18: i32 = X86ISD::CMP undef:i1, Constant:i1<-1>
t20: i64 = X86ISD::ADC Constant:i64<1>, Constant:i64<0>, t18
t7: ch,glue = CopyToReg t0, Register:i64 %RAX, t20
t8: ch = X86ISD::RET_FLAG t7, TargetConstant:i32<0>, Register:i64 %RAX, t7:1
[...]
LLVM ERROR: Cannot select: 0x2ec28d0: i32 = X86ISD::CMP undef:i1,
Constant:i1<-1>
0x2ec2240: i1 = undef
0x2ec2710: i1 = Constant<-1>
In function: foo</pre>
</div>
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