_mm256_maskz_popcnt_epi64
Classification
AVX-512, Bit Manipulation, CPUID Test: AVX512VPOPCNTDQ
Header File
immintrin.h
Instruction
VPOPCNTQ ymm {z}, ymm
Synopsis
 _mm256_maskz_popcnt_epi64(__mmask8 k, __m256i a);
Description
Count the number of logical 1 bits in packed 64-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 3
	i := j*64
	IF k[j]
		dst[i+63:i] := POPCNT(a[i+63:i])
	ELSE
		dst[i+63:i] := 0
	FI
ENDFOR
dst[MAX:256] := 0