_mm256_maskz_shldi_epi16
Classification
AVX-512, Shift, CPUID Test: AVX512_VBMI2
Header File
immintrin.h
Instruction
VPSHLDW ymm {z}, ymm, ymm, imm8
Synopsis
 _mm256_maskz_shldi_epi16(__mmask16 k, __m256i a, __m256i b, int imm8);
Description
Concatenate packed 16-bit integers in "a" and "b" producing an intermediate 32-bit result. Shift the result left by "imm8" bits, and store the upper 16-bits in "dst" using zeromask "k" (elements are zeroed out 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]) << imm8[3:0]
		dst[i+15:i] := tmp[31:16]
	ELSE
		dst[i+15:i] := 0
	FI
ENDFOR
dst[MAX:256] := 0