B.4.247. `POR': MMX Bitwise OR
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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.