A.5.247 POR: MMX Bitwise OR
POR mm1,mm2/m64 ; 0F EB /r [PENT,MMX]
POR xmm1,xmm2/m128 ; 66 0F EB /r [WILLAMETTE,SSE2]
POR performs a bitwise OR operation between its two operands (i.e. each
bit of the result is 1 if and only if at least one of the corresponding
bits of the two inputs was 1), and stores the result in the destination
(first) operand.