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(nasm.info)Section B.4.91

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B.4.91. `FLDENV': Load Floating-Point Environment
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     FLDENV mem                    ; D9 /4                [8086,FPU]

   `FLDENV' loads the FPU operating environment (control word, status
word, tag word, instruction pointer, data pointer and last opcode) from
memory. The memory area is 14 or 28 bytes long, depending on the CPU
mode at the time. See also `FSTENV' (*Note Section B.4.104::).