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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - New vector shuffle legality: turns blendp+permp to permp+permilp+blendp."
href="http://llvm.org/bugs/show_bug.cgi?id=22412">22412</a>
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<th>Summary</th>
<td>New vector shuffle legality: turns blendp+permp to permp+permilp+blendp.
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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
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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
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ahmed.bougacha@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13784" name="attach_13784" title="IR testcase">attachment 13784</a> <a href="attachment.cgi?id=13784&action=edit" title="IR testcase">[details]</a></span>
IR testcase
For the attached IR, we used to generate (targeting core-avx2):
vblendpd $1, %ymm0, %ymm1, %ymm0 ## ymm0 = ymm0[0],ymm1[1,2,3]
vmovaps LCPI0_0(%rip), %ymm1 ## ymm1 = [1,0,7,6,5,4,3,2]
vpermps %ymm0, %ymm1, %ymm0
With the new all-shuffles-are-legal lowering, we now generate:
vmovaps LCPI0_0(%rip), %ymm2 ## ymm2 = <u,u,7,6,5,4,3,2>
vpermps %ymm1, %ymm2, %ymm1
vpermilps $225, %ymm0, %ymm0 ## ymm0 = ymm0[1,0,2,3,5,4,6,7]
vblendpd $1, %ymm0, %ymm1, %ymm0 ## ymm0 = ymm0[0],ymm1[1,2,3]</pre>
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