_mm256_maskz_popcnt_epi8
Classification
AVX-512, Bit Manipulation, CPUID Test: AVX512_BITALG
Header File
Instruction
VPOPCNTB ymm {z}, ymm
Synopsis
_mm256_maskz_popcnt_epi8(__mmask32 k, __m256i a);
Description
Count the number of logical 1 bits in packed 8-bit integers in "a", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
DEFINE POPCNT(a) {
count := 0
DO WHILE a > 0
count += a[0]
a >>= 1
OD
RETURN count
}
FOR j := 0 to 31
i := j*8
IF k[j]
dst[i+7:i] := POPCNT(a[i+7:i])
ELSE
dst[i+7:i] := 0
FI
ENDFOR
dst[MAX:256] := 0