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(nasm.info)Section B.4.192

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B.4.192. `ORPD': Bit-wise Logical OR of Double-Precision FP Data
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     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.