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(nasm.info)Section B.4.133

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B.4.133. `LDMXCSR': Load Streaming SIMD Extension Control/Status
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     LDMXCSR mem32                 ; 0F AE /2        [KATMAI,SSE]

   `LDMXCSR' loads 32-bits of data from the specified memory location
into the `MXCSR' control/status register. `MXCSR' is used to enable
masked/unmasked exception handling, to set rounding modes, to set
flush-to-zero mode, and to view exception status flags.

   For details of the `MXCSR' register, see the Intel processor docs.

   See also `STMXCSR' (*Note Section B.4.302::