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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 --- - Cannot copy AL to XMMO" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23979&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=u9QNkNozN7EkIhBvKkxNMYRyrJ-_k1KokxyJ7FCNR3A&s=HgdQYjtVb6-wk9THf0yFUAHPWPpl02mXOz02_fja72U&e=">23979</a>
</td>
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<th>Summary</th>
<td>Cannot copy AL to XMMO
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<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>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chfast@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>llc with FastISel (-O0) fails to compile the IR for X86 target. Assert fails
with comment: "Cannot copy AL to XMM0. Cannot emit physreg copy instruction."
Test code:
target triple = "x86_64-unknown-linux-gnu"
define <8 x i1> @test() {
%C = icmp ult <8 x i16> zeroinitializer, zeroinitializer
br label %B
B:
%I = insertelement <8 x i1> %C, i1 undef, i32 0
ret <8 x i1> %I
}</pre>
</div>
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