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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 - Logic operations on AVX512 __mmask16 do not generate appropriate instructions"
href="https://bugs.llvm.org/show_bug.cgi?id=37388">37388</a>
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<tr>
<th>Summary</th>
<td>Logic operations on AVX512 __mmask16 do not generate appropriate instructions
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<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>fabiang@radgametools.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>Test case:
// ---- begin
#include <immintrin.h>
extern "C" void f(void *p, __m512i a, __m512i b, __m512i c, __m512i d)
{
__mmask16 mask1 = _mm512_test_epi32_mask(a, b);
__mmask16 mask2 = _mm512_cmple_epu32_mask(c, d);
__mmask16 mask3 = mask1 & ~mask2;
_mm512_mask_storeu_epi32(p, mask3, a);
}
// ---- end
compiled with 6.0 release "clang-cl -c -O2 -FA avx512_logic.cpp -mavx512f" (the
equivalent should work with the gcc-compatible drivers too, nothing
MSVC-specific in here) produces:
# ---- begin
f: # @f
# %bb.0:
movq 40(%rsp), %rax
vmovdqa32 (%rdx), %zmm0
vptestmd (%r8), %zmm0, %k0
kmovw %k0, %edx
vmovdqa32 (%r9), %zmm1
vpcmpleud (%rax), %zmm1, %k0
kmovw %k0, %eax
notl %eax
andl %edx, %eax
kmovw %eax, %k1
vmovdqu32 %zmm0, (%rcx) {%k1}
vzeroupper
retq
# ---- end
expected: the kmovw/notl/andl/kmovw sequence should instead be a single "kandnw
%k1, %k0, %k1".</pre>
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