pub fn xselect32<E>( into: &mut E, dst: impl Into<XReg>, cond: impl Into<XReg>, if_nonzero: impl Into<XReg>, if_zero: impl Into<XReg>, )where E: Extend<u8>,
low32(dst) = low32(cond) ? low32(if_nonzero) : low32(if_zero)