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Add methods that perform the shift and return a `Bounded` with the appropriately adjusted bit width. These methods are particularly useful for bitfield extraction. Suggested-by: Alice Ryhl Reviewed-by: Alice Ryhl Signed-off-by: Alexandre Courbot --- rust/kernel/num/bounded.rs | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/rust/kernel/num/bounded.rs b/rust/kernel/num/bounded.rs index f870080af8ac..8782535770f1 100644 --- a/rust/kernel/num/bounded.rs +++ b/rust/kernel/num/bounded.rs @@ -470,6 +470,46 @@ pub fn cast(self) -> Bounded // `N` bits, and with the same signedness. Bounded::__new(value) } + + /// Right-shifts `self` by `SHIFT` and returns the result as a `Bounde= d<_, { N - SHIFT }>`. + /// + /// # Examples + /// + /// ``` + /// use kernel::num::Bounded; + /// + /// let v =3D Bounded::::new::<0xff00>(); + /// let v_shifted: Bounded:: =3D v.shr::<8, _>(); + /// + /// assert_eq!(v_shifted.get(), 0xff); + /// ``` + pub fn shr(self) -> Bounded { + const { assert!(RES >=3D N - SHIFT) } + + // SAFETY: we shift the value right by `SHIFT`, reducing the numbe= r of bits needed to + // represent the shifted value by as much, and just asserted that = `RES =3D=3D N - SHIFT`. + unsafe { Bounded::__new(self.0 >> SHIFT) } + } + + /// Left-shifts `self` by `SHIFT` and returns the result as a `Bounded= <_, { N + SHIFT }>`. + /// + /// # Examples + /// + /// ``` + /// use kernel::num::Bounded; + /// + /// let v =3D Bounded::::new::<0xff>(); + /// let v_shifted: Bounded:: =3D v.shl::<8, _>(); + /// + /// assert_eq!(v_shifted.get(), 0xff00); + /// ``` + pub fn shl(self) -> Bounded { + const { assert!(RES >=3D N + SHIFT) } + + // SAFETY: we shift the value left by `SHIFT`, augmenting the numb= er of bits needed to + // represent the shifted value by as much, and just asserted that = `RES =3D=3D N + SHIFT`. + unsafe { Bounded::__new(self.0 << SHIFT) } + } } =20 impl Deref for Bounded --=20 2.52.0