_mm_mask_i64gather_pd
Classification
AVX_ALL, Load, CPUID Test: AVX2
Header File
immintrin.h
Instruction
VGATHERQPD xmm, vm64x, xmm
Synopsis
 _mm_mask_i64gather_pd(__m128d src, double const* base_addr, __m128i vindex, __m128d mask, const int scale);
Description
Gather double-precision (64-bit) floating-point elements 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 1
	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:128] := 0
dst[MAX:128] := 0