_mm256_mmask_i64gather_ps
Classification
Header File
Instruction
VGATHERQPS ymm {k}, vm64y
Synopsis
_mm256_mmask_i64gather_ps(__m128 src, __mmask8 k, __m256i vindex, void const* base_addr, 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" 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 3
i := j*32
m := j*64
IF k[j]
addr := base_addr + vindex[m+63:m] * ZeroExtend64(scale) * 8
dst[i+31:i] := MEM[addr+31:addr]
ELSE
dst[i+31:i] := src[i+31:i]
FI
ENDFOR
dst[MAX:128] := 0