## addps - add packed singles (32 bit floating point)

    dest[0] = dest[0] + source[0]
    dest[1] = dest[1] + source[1]
    dest[2] = dest[2] + source[2]
    dest[3] = dest[3] + source[3]

The addps instruction adds the 4 source values (second operand) to the 4 values of the destination (an XMM register). The source can be an XMM register or a 32 bit memory location. There is also vaddps on CPUs with AVX instructions which allows using 3 XMM registers or 2 XMM registers and a memory location which can simplify coding and which adds 8 pairs of values if you use YMM registers.

            addps   xmm0, xmm1          ; add 4 pairs of values from xmm1 to xmm0
                                        ; leave the rest of ymm0 as is
            addps   xmm0, [x]           ; add 4 pairs of values from x to xmm0
                                        ; x is an array of floats
                                        ; leave the rest of ymm0 as is
            vaddps  xmm3, xmm0, xmm15   ; add 4 pairs of values from xmm0 & xmm15
                                        ; store results in xmm3
            vaddps  ymm3, ymm0, [x]     ; add 8 pairs of values from ymm0 & x
                                        ; store results in ymm3
            vaddps  ymm3, ymm0, [rsi]   ; add 8 pairs of values from ymm0 & [rsi]
                                        ; rsi contains the address of an array
                                        ; store results in ymm3

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