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(nasm.info)Section B.4.90

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B.4.90. `FLDCW': Load Floating-Point Control Word
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     FLDCW mem16                   ; D9 /5                [8086,FPU]

   `FLDCW' loads a 16-bit value out of memory and stores it into the FPU
control word (governing things like the rounding mode, the precision,
and the exception masks). See also `FSTCW' (*Note Section B.4.103::). If
exceptions are enabled and you don't want to generate one, use `FCLEX'
or `FNCLEX' (*Note Section B.4.71::) before loading the new control
word.