_mm256_mask_shldv_epi64
Classification
AVX-512, Shift, CPUID Test: AVX512_VBMI2
Header File
immintrin.h
Instruction
VPSHLDVQ ymm {k}, ymm, ymm
Synopsis
 _mm256_mask_shldv_epi64(__m256i a, __mmask8 k, __m256i b, __m256i c);
Description
Concatenate packed 64-bit integers in "a" and "b" producing an intermediate 128-bit result. Shift the result left by the amount specified in the corresponding element of "c", and store the upper 64-bits in "dst" using writemask "k" (elements are copied from "a" when the corresponding mask bit is not set).
Operation
FOR j := 0 to 3
	i := j*64
	IF k[j]
		tmp[127:0] := ((a[i+63:i] << 64)[127:0] | b[i+63:i]) << (c[i+63:i] & 63)
		dst[i+63:i] := tmp[127:64]
	ELSE
		dst[i+63:i] := a[i+63:i]
	FI
ENDFOR
dst[MAX:256] := 0