diff options
Diffstat (limited to 'src/arm32/predicate')
| -rw-r--r-- | src/arm32/predicate/mod.rs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/arm32/predicate/mod.rs b/src/arm32/predicate/mod.rs index 0b761d9..66b6534 100644 --- a/src/arm32/predicate/mod.rs +++ b/src/arm32/predicate/mod.rs @@ -20,6 +20,7 @@ // If not, see <https://www.gnu.org/licenses/>. use core::fmt::Display; +use core::mem::transmute; /// An instruction predicate (condition code). /// @@ -48,6 +49,22 @@ pub enum Predicate { //Never = 0b1111, } +impl Predicate { + /// Converts the provided byte into a register identifier. + /// If the byte's value is not a valid predicate, [`None`] is returned. + /// + /// This conversion is valid for all values less than or equal (14). + #[inline] + #[must_use] + pub const fn from_u8(value: u8) -> Option<Self> { + if value <= 0b1110 { + Some(unsafe { transmute::<u8, Self>(value) }) + } else { + None + } + } +} + impl Display for Predicate { fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { use Predicate::*; |