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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Bug in lowering of llvm.ctlz with vector arguments"
href="http://llvm.org/bugs/show_bug.cgi?id=20917">20917</a>
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<th>Summary</th>
<td>Bug in lowering of llvm.ctlz with vector arguments
</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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>avolkov.intel@gmail.com
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<th>Reporter</th>
<td>avolkov.intel@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, zinovy.nis@gmail.com
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13025" name="attach_13025" title="Resulting assembler">attachment 13025</a> <a href="attachment.cgi?id=13025&action=edit" title="Resulting assembler">[details]</a></span>
Resulting assembler
For the following test case llc -mattr=+sse2 produces wrong code.
define <2 x i32> @test(<2 x i32> %x) {
%1 = call <2 x i32> @llvm.ctlz.v2i32(<2 x i32> %x, i1 false)
ret <2 x i32> %1
}
declare <2 x i32> @llvm.ctlz.v2i32(<2 x i32>, i1)
I attached resulting assembler.
The problem is in psubq instruction:
.LCPI0_1:
.long 64 # 0x40 <-- expected 32
.long 0 # 0x0
.long 64 # 0x40
.long 0 # 0x0
....
psubq .LCPI0_1, %xmm1</pre>
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