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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - shufflevector of load does not reduce load size"
href="https://bugs.llvm.org/show_bug.cgi?id=42424">42424</a>
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<th>Summary</th>
<td>shufflevector of load does not reduce load size
</td>
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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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>Matthew.Arsenault@amd.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>define <4 x half> @shuffle_v4f16_0101(<4 x half> addrspace(1)* nocapture
readonly %arg0, <4 x half> addrspace(1)* nocapture readnone %arg1) {
%val0 = load <4 x half>, <4 x half> addrspace(1)* %arg0, align 8
%shuffle = shufflevector <4 x half> %val0, <4 x half> undef, <4 x i32> <i32
0, i32 1, i32 0, i32 1>
ret <4 x half> %shuffle
}
I would expect instcombine to recognize that only the low half of the load is
used, and reduce this to a load <2 x half></pre>
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