_mm256_mask_shldv_epi16
Classification
AVX-512, Shift, CPUID Test: AVX512_VBMI2
Header File
Instruction
VPSHLDVW ymm {k}, ymm, ymm
Synopsis
_mm256_mask_shldv_epi16(__m256i a, __mmask16 k, __m256i b, __m256i c);
Description
Concatenate packed 16-bit integers in "a" and "b" producing an intermediate 32-bit result. Shift the result left by the amount specified in the corresponding element of "c", and store the upper 16-bits in "dst" using writemask "k" (elements are copied from "a" when the corresponding mask bit is not set).
Operation
FOR j := 0 to 15
i := j*16
IF k[j]
tmp[31:0] := ((a[i+15:i] << 16)[31:0] | b[i+15:i]) << (c[i+15:i] & 15)
dst[i+15:i] := tmp[31:16]
ELSE
dst[i+15:i] := a[i+15:i]
FI
ENDFOR
dst[MAX:256] := 0