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<body><span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - New vector shuffle legality: turns pshufd+palignr into shufps x2."
href="https://bugs.llvm.org/show_bug.cgi?id=22391">bug 22391</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>325354
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - New vector shuffle legality: turns pshufd+palignr into shufps x2."
href="https://bugs.llvm.org/show_bug.cgi?id=22391#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - New vector shuffle legality: turns pshufd+palignr into shufps x2."
href="https://bugs.llvm.org/show_bug.cgi?id=22391">bug 22391</a>
from <span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span></b>
<pre>This was finally fixed at the DAG level by rL325354 (SimplifyDemandedVectorElts
shuffle mask simplification).
Note, it'd have been effectively fixed for sometime as InstCombine would
already simplify the test case from:
%s1 = shufflevector <4 x i32> %a, <4 x i32> undef, <4 x i32> <i32 0, i32 1,
i32 2, i32 2>
%s2 = shufflevector <4 x i32> %s1, <4 x i32> %b, <4 x i32> <i32 3, i32 4, i32
5, i32 6>
ret <4 x i32> %s2
to
%s1 = shufflevector <4 x i32> %a, <4 x i32> undef, <4 x i32> <i32 undef, i32
undef, i32 undef, i32 2>
%s2 = shufflevector <4 x i32> %s1, <4 x i32> %b, <4 x i32> <i32 3, i32 4, i32
5, i32 6>
ret <4 x i32> %s2
which would correctly lower to vpshufd/vpalignr.</pre>
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