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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to use vpmovmskb instead of vpmovb2m+kmovd"
href="https://bugs.llvm.org/show_bug.cgi?id=46200">46200</a>
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<th>Summary</th>
<td>Failure to use vpmovmskb instead of vpmovb2m+kmovd
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</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>gabravier@gmail.com
</td>
</tr>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>int f(__m256i mask)
{
return _mm256_movemask_epi8(mask);
}
With -O3 -mavx512bw, GCC outputs this :
f(long long __vector(4)):
vpmovmskb eax, ymm0
ret
LLVM outputs this :
f(long long __vector(4)): # @f(long long __vector(4))
vpmovb2m k0, zmm0
kmovd eax, k0
vzeroupper
ret</pre>
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