A.5.4 ADDPD: ADD Packed Double-Precision FP Values
ADDPD xmm1,xmm2/mem128 ; 66 0F 58 /r [WILLAMETTE,SSE2]
ADDPD performs addition on each of two packed double-precision FP value
pairs.
dst[0-63] := dst[0-63] + src[0-63],
dst[64-127] := dst[64-127] + src[64-127].
The destination is an XMM register. The source operand can be either an
XMM register or a 128-bit memory location.