_mm_i64gather_epi64
Classification
AVX_ALL, Load, CPUID Test: AVX2
Header File
immintrin.h
Instruction
VPGATHERQQ xmm, vm64x, xmm
Synopsis
 _mm_i64gather_epi64(__int64 const* base_addr, __m128i vindex, 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". "scale" should be 1, 2, 4 or 8.
Operation
FOR j := 0 to 1
	i := j*64
	m := j*64
	addr := base_addr + vindex[m+63:m] * ZeroExtend64(scale) * 8
	dst[i+63:i] := MEM[addr+63:addr]
ENDFOR
dst[MAX:128] := 0