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(nasm.info)Section B.4.6

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B.4.6. `ADDSD': ADD Scalar Double-Precision FP Values
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     ADDSD xmm1,xmm2/mem64         ; F2 0F 58 /r     [KATMAI,SSE]

   `ADDSD' adds the low double-precision FP values from the source and
destination operands and stores the double-precision FP result in the
destination operand.

        dst[0-63]   := dst[0-63] + src[0-63],
        dst[64-127) remains unchanged.

   The destination is an `XMM' register. The source operand can be
either an `XMM' register or a 64-bit memory location.