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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AVX512] Supoptimal mask operation"
href="https://bugs.llvm.org/show_bug.cgi?id=47573">47573</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[AVX512] Supoptimal mask operation
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>-Ofast -mavx512bw -mno-avx512dq -mno-avx512vl -mno-xop
-mprefer-vector-width=512
Clang:
f1(char*, char*, char*): # @f1(char*, char*, char*)
vmovdqu64 zmm0, zmmword ptr [rsi]
vpcmpltb k1, zmm0, zmmword ptr [rdx]
vmovdqu8 zmm1 {k1} {z}, zmmword ptr [rdi]
vmovdqu8 zmm0 {k1}, zmm1
vmovdqu64 zmmword ptr [rdi], zmm0
vzeroupper
ret
f2(unsigned char*, unsigned char*, unsigned char*):
# @f2(unsigned char*, unsigned char*, unsigned char*)
vmovdqu64 zmm0, zmmword ptr [rsi]
vpcmpltub k1, zmm0, zmmword ptr [rdx]
vmovdqu8 zmm1 {k1} {z}, zmmword ptr [rdi]
vmovdqu8 zmm0 {k1}, zmm1
vmovdqu64 zmmword ptr [rdi], zmm0
vzeroupper
ret
f3(char*, char*, char*): # @f3(char*, char*, char*)
vmovdqu64 zmm0, zmmword ptr [rsi]
vpcmpgtb k1, zmm0, zmmword ptr [rdx]
vmovdqu8 zmm1 {k1} {z}, zmmword ptr [rdi]
vmovdqu8 zmm0 {k1}, zmm1
vmovdqu64 zmmword ptr [rdi], zmm0
vzeroupper
ret
GCC:
f1(char*, char*, char*):
vmovdqu8 zmm0, ZMMWORD PTR [rsi]
vpcmpb k1, zmm0, ZMMWORD PTR [rdx], 5
vmovdqu8 ZMMWORD PTR [rdi]{k1}, zmm0
vzeroupper
ret
f2(unsigned char*, unsigned char*, unsigned char*):
vmovdqu8 zmm0, ZMMWORD PTR [rsi]
vpcmpub k1, zmm0, ZMMWORD PTR [rdx], 5
vmovdqu8 ZMMWORD PTR [rdi]{k1}, zmm0
vzeroupper
ret
f3(char*, char*, char*):
vmovdqu8 zmm0, ZMMWORD PTR [rsi]
vpcmpb k1, zmm0, ZMMWORD PTR [rdx], 2
vmovdqu8 ZMMWORD PTR [rdi]{k1}, zmm0
vzeroupper
ret
More examples: <a href="https://godbolt.org/z/MjaKeE">https://godbolt.org/z/MjaKeE</a></pre>
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