_mm256_mask_i64gather_epi64
Classification
AVX_ALL, Load, CPUID Test: AVX2
Header File
immintrin.h
Instruction
VPGATHERQQ ymm, vm64x, ymm
Synopsis
 _mm256_mask_i64gather_epi64(__m256i src, __int64 const* base_addr, __m256i vindex, __m256i mask, const int scale);
Description
Gather 64-bit integers from memory using 64-bit indices. 64-bit elements are loaded from addresses starting at "base_addr" and offset by each 64-bit element in "vindex" (each index is scaled by the factor in "scale"). Gathered elements are merged into "dst" using "mask" (elements are copied from "src" when the highest bit is not set in the corresponding element). "scale" should be 1, 2, 4 or 8.
Operation
FOR j := 0 to 3
	i := j*64
	m := j*64
	IF mask[i+63]
		addr := base_addr + vindex[m+63:m] * ZeroExtend64(scale) * 8
		dst[i+63:i] := MEM[addr+63:addr]
	ELSE
		dst[i+63:i] := src[i+63:i]
	FI
ENDFOR
mask[MAX:256] := 0
dst[MAX:256] := 0