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 andnps instruction and-nots 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 vandnps 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 and-nots 8 pairs of values if you use YMM registers.
There is also andnpd which and-nots packed doubles. The result is the same so pick your favorite.
andnps xmm0, xmm1 ; and-not 4 pairs of values from xmm0 & xmm1 ; leave the rest of ymm0 as is andnps xmm0, [x] ; and-not 4 pairs of values from xmm0 & x ; x is an array of floats ; leave the rest of ymm0 as is vandnps xmm3, xmm0, xmm15 ; and-not 4 pairs of values from xmm0 & xmm15 ; store results in xmm3 vandnps ymm3, ymm0, [x] ; and-not 8 pairs of values from ymm0 & x ; store results in ymm3 vandnps ymm3, ymm0, [rsi] ; and-not 8 pairs of values from ymm0 & [rsi] ; rsi contains the address of an array ; store results in ymm3