_mm256_maskz_alignr_epi8
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512BW
Header File
Instruction
VPALIGNR ymm {z}, ymm, ymm, imm8
Synopsis
_mm256_maskz_alignr_epi8(__mmask32 k, __m256i a, __m256i b, const int imm8);
Description
Concatenate pairs of 16-byte blocks in "a" and "b" into a 32-byte temporary result, shift the result right by "imm8" bytes, and store the low 16 bytes in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
FOR j := 0 to 1
i := j*128
tmp[255:0] := ((a[i+127:i] << 128)[255:0] OR b[i+127:i]) >> (imm8*8)
tmp_dst[i+127:i] := tmp[127:0]
ENDFOR
FOR j := 0 to 31
i := j*8
IF k[j]
dst[i+7:i] := tmp_dst[i+7:i]
ELSE
dst[i+7:i] := 0
FI
ENDFOR
dst[MAX:256] := 0