NASM 2.05 based x86 Instruction Reference[ch215]
A.5.192 ORPD: Bit-wise Logical OR of Double-Precision FP Data ORPD xmm1,xmm2/m128 ; 66 0F 56 /r [WILLAMETTE,SSE2] ORPD return a bit-wise logical OR between xmm1 and xmm2/mem, and stores the result in xmm1. If the source operand is a memory location, it must be aligned to a 16-byte boundary.