Constant core::arch::x86_64::_MM_FROUND_RINT

pub const _MM_FROUND_RINT: i32 = _MM_FROUND_RAISE_EXC | _MM_FROUND_CUR_DIRECTION; // 4i32

This is supported on x86-64 only.

use MXCSR.RC and do not suppress exceptions; see vendor::_MM_SET_ROUNDING_MODE