## andps - and packed singles

    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 andps instruction ands 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 vandps 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 ands 8 pairs of values if you use YMM registers.

There is also andpd which ands packed doubles. The result is the same so pick your favorite.

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

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