noteuclid/f8
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

support subtraction

Browse Source
This commit is contained in:
numzero 2025-11-02 02:47:07 +03:00
parent 25fba68cd5
commit 2f7e21a657
1 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/ops.rs
View File

@ -18,6 +18,26 @@ impl std::ops::Add for F8 {
} }
} }
impl std::ops::Sub for F8 {
type Output = Self;
fn sub(self, rhs: Self) -> Self::Output {
let (m1, e1) = self.split_unbias();
let (m2, e2) = rhs.split_unbias();
if e1 < e2 {
return Self(0);
}
if rhs.0 == 0 {
return self;
}
let e_diff = e1 - e2;
let Some(m) = m1.checked_sub(m2 >> e_diff) else {
return Self(0);
};
Self::merge_unbias(m, e1)
}
}
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;
@ -32,4 +52,15 @@ mod tests {
assert_eq!(F8::from(0b0011) + F8::from(0b0111), F8::from(0b1010)); assert_eq!(F8::from(0b0011) + F8::from(0b0111), F8::from(0b1010));
assert_eq!(F8::from(0b1100) + F8::from(0b0001), F8::from(0b1101)); assert_eq!(F8::from(0b1100) + F8::from(0b0001), F8::from(0b1101));
} }
#[test]
fn test_sub() {
assert_eq!(F8::from(0b0011) - F8::from(0b0000), F8::from(0b0011));
assert_eq!(F8::from(0b0000) - F8::from(0b0111), F8::from(0));
assert_eq!(F8::from(0b0011) - F8::from(0b0101), F8::from(0));
assert_eq!(F8::from(0b0101) - F8::from(0b0011), F8::from(0b0010));
assert_eq!(F8::from(0b0110) - F8::from(0b0011), F8::from(0b0011));
assert_eq!(F8::from(0b0111) - F8::from(0b0011), F8::from(0b0100));
assert_eq!(F8::from(0b1100) - F8::from(0b0001), F8::from(0b1011));
}
} }