_mm_i64gather_ps
Classification
Header File
Instruction
VGATHERQPS xmm, vm64x, xmm
Synopsis
_mm_i64gather_ps(float const* base_addr, __m128i vindex, const int scale);
Description
Gather single-precision (32-bit) floating-point elements from memory using 64-bit indices. 32-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*32
m := j*64
addr := base_addr + vindex[m+63:m] * ZeroExtend64(scale) * 8
dst[i+31:i] := MEM[addr+31:addr]
ENDFOR
dst[MAX:64] := 0