https://bugs.llvm.org/show_bug.cgi?id=37388
Bug ID: 37388
Summary: Logic operations on AVX512 __mmask16 do not generate
appropriate instructions
Product: libraries
Version: 6.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: fabi...@radgametools.com
CC: llvm-bugs@lists.llvm.org
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".
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