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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 --- - [ARM] Extra vmov converting <1 x i64> to i64"
href="https://llvm.org/bugs/show_bug.cgi?id=31327">31327</a>
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<th>Summary</th>
<td>[ARM] Extra vmov converting <1 x i64> to i64
</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>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>efriedma@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
define i64 @func1(<2 x i64> %x) {
entry:
%shuffle.i = shufflevector <2 x i64> %x, <2 x i64> undef, <1 x i32>
zeroinitializer
%shuffle.i6 = shufflevector <2 x i64> %x, <2 x i64> undef, <1 x i32> <i32 1>
%add.i = add <1 x i64> %shuffle.i6, %shuffle.i
%vget_lane = extractelement <1 x i64> %add.i, i32 0
ret i64 %vget_lane
}
Current output from llc -mtriple=thumbv7-arm-linux-gnueabi:
vmov d17, r2, r3
vmov d16, r0, r1
vadd.i64 d16, d17, d16
vmov.32 r0, d16[0]
vmov.32 r1, d16[1]
bx lr
The two vmov.32 instructions could be reduced to one "vmov r0, r1, d16".</pre>
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