_mm_mmask_i32gather_epi64
Classification
Header File
Instruction
VPGATHERDQ xmm {k}, vm32x
Synopsis
_mm_mmask_i32gather_epi64(__m128i src, __mmask8 k, __m128i vindex, void const* base_addr, const int scale);
Description
Gather 64-bit integers from memory using 32-bit indices. 64-bit elements are loaded from addresses starting at "base_addr" and offset by each 32-bit element in "vindex" (each index is scaled by the factor in "scale"). Gathered elements are merged into "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set). "scale" should be 1, 2, 4 or 8.
Operation
FOR j := 0 to 1
i := j*64
m := j*32
IF k[j]
addr := base_addr + SignExtend64(vindex[m+31:m]) * ZeroExtend64(scale) * 8
dst[i+63:i] := MEM[addr+63:addr]
ELSE
dst[i+63:i] := src[i+63:i]
FI
ENDFOR
dst[MAX:128] := 0