Get the exception mask bits from the MXCSR control and status register.
The exception mask may contain any of the following flags: _MM_MASK_INVALID,
_MM_MASK_DIV_ZERO, _MM_MASK_DENORM, _MM_MASK_OVERFLOW, _MM_MASK_UNDERFLOW, _MM_MASK_INEXACT.
Note: won't correspond to reality on non-x86, where MXCSR this is emulated.
Get the exception mask bits from the MXCSR control and status register. The exception mask may contain any of the following flags: _MM_MASK_INVALID, _MM_MASK_DIV_ZERO, _MM_MASK_DENORM, _MM_MASK_OVERFLOW, _MM_MASK_UNDERFLOW, _MM_MASK_INEXACT. Note: won't correspond to reality on non-x86, where MXCSR this is emulated.