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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 --- - Improve *_EXTEND_VECTOR_INREG codegen for illegal types"
href="https://llvm.org/bugs/show_bug.cgi?id=30635">30635</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Improve *_EXTEND_VECTOR_INREG codegen for illegal types
</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>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</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, mkuper@google.com, pirama@google.com, spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre><a href="https://reviews.llvm.org/D25268">https://reviews.llvm.org/D25268</a> fixed integer promotion but the codegen is
still pretty nasty - there is no need for us to vectorize in this case, we
should just call movzbl/movsbl load+ext:
define <3 x i16> @zext_i8(<3 x i8>) {
%2 = zext <3 x i8> %0 to <3 x i16>
ret <3 x i16> %2
}
zext_i8:
vpxor %xmm0, %xmm0, %xmm0
vpinsrb $0, 4(%esp), %xmm0, %xmm0
vpinsrb $4, 8(%esp), %xmm0, %xmm0
vpinsrb $8, 12(%esp), %xmm0, %xmm0
vmovd %xmm0, %eax
vpextrw $2, %xmm0, %edx
vpextrw $4, %xmm0, %ecx
retl
define <3 x i16> @sext_i8(<3 x i8>) {
%2 = sext <3 x i8> %0 to <3 x i16>
ret <3 x i16> %2
}
sext_i8:
vpinsrb $0, 4(%esp), %xmm0, %xmm0
vpinsrb $4, 8(%esp), %xmm0, %xmm0
vpinsrb $8, 12(%esp), %xmm0, %xmm0
vpslld $24, %xmm0, %xmm0
vpsrad $24, %xmm0, %xmm0
vmovd %xmm0, %eax
vpextrw $2, %xmm0, %edx
vpextrw $4, %xmm0, %ecx
retl</pre>
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