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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 --- - Failure to combine scalar load+zext into vector load+zext"
href="https://llvm.org/bugs/show_bug.cgi?id=31309">31309</a>
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<th>Summary</th>
<td>Failure to combine scalar load+zext into vector load+zext
</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>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</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>define <4 x i32> @load_i32_zext_i128_v4i32(i32* %in) {
%1 = load i32, i32* %in
%2 = zext i32 %1 to i128
%3 = bitcast i128 %2 to <4 x i32>
ret <4 x i32> %3
}
Current output:
load_i32_zext_i128_v4i32:
movl (%rdi), %eax
vmovq %rax, %xmm0
retq
It would be better if we managed:
load_i32_zext_i128_v4i32:
vmovd (%rdi), %xmm0
retq</pre>
</div>
</p>
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