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(nasm.info)Section B.4.7

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B.4.7. `ADDSS': ADD Scalar Single-Precision FP Values
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     ADDSS xmm1,xmm2/mem32         ; F3 0F 58 /r     [WILLAMETTE,SSE2]

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

        dst[0-31]   := dst[0-31] + src[0-31],
        dst[32-127] remains unchanged.

   The destination is an `XMM' register. The source operand can be
either an `XMM' register or a 32-bit memory location.