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(nasm.info)Section B.4.4

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B.4.4. `ADDPD': ADD Packed Double-Precision FP Values
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     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.