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 orps instruction ors 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 vorps 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 ors 8 pairs of values if you use YMM registers.
There is also orpd which ors packed doubles. The result is the same so pick your favorite.
orps xmm0, xmm1 ; or 4 pairs of values from xmm0 & xmm1 ; leave the rest of ymm0 as is orps xmm0, [x] ; or 4 pairs of values from xmm0 & x ; x is an array of floats ; leave the rest of ymm0 as is vorps xmm3, xmm0, xmm15 ; or 4 pairs of values from xmm0 & xmm15 ; store results in xmm3 vorps ymm3, ymm0, [x] ; or 8 pairs of values from ymm0 & x ; store results in ymm3 vorps ymm3, ymm0, [rsi] ; or 8 pairs of values from ymm0 & [rsi] ; rsi contains the address of an array ; store results in ymm3