_mm_i32gather_epi64
Classification
Header File
Instruction
VPGATHERDQ xmm, vm32x, xmm
Synopsis
_mm_i32gather_epi64(__int64 const* base_addr, __m128i vindex, 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". "scale" should be 1, 2, 4 or 8.
Operation
FOR j := 0 to 1
i := j*64
m := j*32
addr := base_addr + SignExtend64(vindex[m+31:m]) * ZeroExtend64(scale) * 8
dst[i+63:i] := MEM[addr+63:addr]
ENDFOR
dst[MAX:128] := 0