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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 - vector operations fail to optimize to _mm_testz_si128 / _mm256_testz_si256"
href="https://bugs.llvm.org/show_bug.cgi?id=37506">bug 37506</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>0101fb73de71132bd5b25cfadc63974c692dbc5b
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - vector operations fail to optimize to _mm_testz_si128 / _mm256_testz_si256"
href="https://bugs.llvm.org/show_bug.cgi?id=37506#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - vector operations fail to optimize to _mm_testz_si128 / _mm256_testz_si256"
href="https://bugs.llvm.org/show_bug.cgi?id=37506">bug 37506</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>I'm going to resolve this - InstCombine will now expand MOVMSK intrinsics to a
generic bitcast(trunc(icmp_slt(x))) pattern that can be optimized much further,
and the backend does a good job of lowering such reduction patterns to PTEST
where appropriate.
In this case we still use MOVMSK as we can avoid the constant load and just
perform it as a CMP+MOVMSK; after 0101fb73de71132bd5b25cfadc63974c692dbc5b we
remove all ashr/icmp ops and just use MOVMSK to directly extract the signbits
of the loaded vectors.</pre>
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