_mm_lzcnt_epi32
Classification
AVX-512, Bit Manipulation, CPUID Test: AVX512CD
Header File
Instruction
VPLZCNTD xmm, xmm
Synopsis
_mm_lzcnt_epi32(__m128i a);
Description
Counts the number of leading zero bits in each packed 32-bit integer in "a", and store the results in "dst".
Operation
FOR j := 0 to 3
i := j*32
tmp := 31
dst[i+31:i] := 0
DO WHILE (tmp >= 0 AND a[i+tmp] == 0)
tmp := tmp - 1
dst[i+31:i] := dst[i+31:i] + 1
OD
ENDFOR
dst[MAX:128] := 0