A.5.302 STMXCSR: Store Streaming SIMD Extension Control/Status
STMXCSR m32 ; 0F AE /3 [KATMAI,SSE]
STMXCSR stores the contents of the MXCSR control/status register to
the specified memory location. 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. The reserved bits in the MXCSR
register are stored as 0s.
For details of the MXCSR register, see the Intel processor docs.
See also LDMXCSR (section A.5.133).