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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - v8.1a CASP accepts register pairs with non-even low register (UNALLOCATED according to spec)"
href="https://llvm.org/bugs/show_bug.cgi?id=30374">30374</a>
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<th>Summary</th>
<td>v8.1a CASP accepts register pairs with non-even low register (UNALLOCATED according to spec)
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ahmed.bougacha@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Stumbled upon this while looking at r281301, which has pairs like "%w19_w20".
>From my reading of DDI0557A.b B11.1.4 "CASP, CASPA, CASPAL, CASPL", that's not
valid:
if Rs<0> == ‘1’ then UNALLOCATED;
if Rt<0> == ‘1’ then UNALLOCATED;</pre>
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