64 lines
1.6 KiB
Rust
64 lines
1.6 KiB
Rust
use minimal_lexical::extended_float::ExtendedFloat;
|
|
use minimal_lexical::rounding;
|
|
|
|
#[test]
|
|
fn round_test() {
|
|
let mut fp = ExtendedFloat {
|
|
mant: 9223372036854776832,
|
|
exp: -10,
|
|
};
|
|
rounding::round::<f64, _>(&mut fp, |f, s| {
|
|
f.mant >>= s;
|
|
f.exp += s;
|
|
});
|
|
assert_eq!(fp.mant, 0);
|
|
assert_eq!(fp.exp, 1);
|
|
|
|
let mut fp = ExtendedFloat {
|
|
mant: 9223372036854776832,
|
|
exp: -10,
|
|
};
|
|
rounding::round::<f64, _>(&mut fp, |f, s| {
|
|
f.mant >>= s;
|
|
f.exp += s;
|
|
// Round-up.
|
|
f.mant += 1;
|
|
});
|
|
assert_eq!(fp.mant, 1);
|
|
assert_eq!(fp.exp, 1);
|
|
|
|
// Round-down
|
|
let mut fp = ExtendedFloat {
|
|
mant: 9223372036854776832,
|
|
exp: -10,
|
|
};
|
|
rounding::round::<f64, _>(&mut fp, |f, s| {
|
|
rounding::round_nearest_tie_even(f, s, |is_odd, is_halfway, is_above| {
|
|
is_above || (is_odd && is_halfway)
|
|
});
|
|
});
|
|
assert_eq!(fp.mant, 0);
|
|
assert_eq!(fp.exp, 1);
|
|
|
|
// Round up
|
|
let mut fp = ExtendedFloat {
|
|
mant: 9223372036854778880,
|
|
exp: -10,
|
|
};
|
|
rounding::round::<f64, _>(&mut fp, |f, s| {
|
|
rounding::round_nearest_tie_even(f, s, |is_odd, is_halfway, is_above| {
|
|
is_above || (is_odd && is_halfway)
|
|
});
|
|
});
|
|
assert_eq!(fp.mant, 2);
|
|
assert_eq!(fp.exp, 1);
|
|
|
|
// Round down
|
|
let mut fp = ExtendedFloat {
|
|
mant: 9223372036854778880,
|
|
exp: -10,
|
|
};
|
|
rounding::round::<f64, _>(&mut fp, rounding::round_down);
|
|
assert_eq!(fp.mant, 1);
|
|
assert_eq!(fp.exp, 1);
|
|
}
|