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(nasm.info)Section B.4.5

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B.4.5. `ADDPS': ADD Packed Single-Precision FP Values
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     ADDPS xmm1,xmm2/mem128        ; 0F 58 /r        [KATMAI,SSE]

   `ADDPS' performs addition on each of four packed single-precision FP
value pairs

        dst[0-31]   := dst[0-31]   + src[0-31],
        dst[32-63]  := dst[32-63]  + src[32-63],
        dst[64-95]  := dst[64-95]  + src[64-95],
        dst[96-127] := dst[96-127] + src[96-127].

   The destination is an `XMM' register. The source operand can be
either an `XMM' register or a 128-bit memory location.