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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [DAGCombine] Missed extractelement(bitcast(scalar_to_vector()) combine"
href="https://bugs.llvm.org/show_bug.cgi?id=39016">39016</a>
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<tr>
<th>Summary</th>
<td>[DAGCombine] Missed extractelement(bitcast(scalar_to_vector()) combine
</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>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>define i32 @test(i64 %a0) {
%1 = insertelement <2 x i64> zeroinitializer, i64 %a0, i32 0
%2 = bitcast <2 x i64> %1 to <4 x i32>
%3 = extractelement <4 x i32> %2, i32 0
ret i32 %3
}
llc -mtriple=x86_64-unknown
test: # @test
movq %rdi, %xmm0
movd %xmm0, %eax
retq
This could be reduced to:
test: # @test
mov %edi, %eax
retq</pre>
</div>
</p>
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