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This commit is contained in:
John Doty 2024-03-08 11:03:01 -08:00
parent 5deceec006
commit 977e3c17e5
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64
third-party/vendor/minimal-lexical/tests/rounding_tests.rs vendored Normal file
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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);
}