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std/time: avoid divisions in Duration::new

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This commit is contained in:
Utkarsh Gupta 2024-01-24 11:10:07 +00:00
parent f6ee4bf384
commit 8a850cd12b
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1 changed files with 12 additions and 7 deletions
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19
library/core/src/time.rs
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@ -197,13 +197,18 @@ impl Duration {
#[must_use]
#[rustc_const_stable(feature = "duration_consts_2", since = "1.58.0")]
pub const fn new(secs: u64, nanos: u32) -> Duration {
let secs = match secs.checked_add((nanos / NANOS_PER_SEC) as u64) {
Some(secs) => secs,
None => panic!("overflow in Duration::new"),
};
let nanos = nanos % NANOS_PER_SEC;
// SAFETY: nanos % NANOS_PER_SEC < NANOS_PER_SEC, therefore nanos is within the valid range
Duration { secs, nanos: unsafe { Nanoseconds(nanos) } }
if nanos < NANOS_PER_SEC {
// SAFETY: nanos < NANOS_PER_SEC, therefore nanos is within the valid range
Duration { secs, nanos: unsafe { Nanoseconds(nanos) } }
} else {
let secs = match secs.checked_add((nanos / NANOS_PER_SEC) as u64) {
Some(secs) => secs,
None => panic!("overflow in Duration::new"),
};
let nanos = nanos % NANOS_PER_SEC;
// SAFETY: nanos % NANOS_PER_SEC < NANOS_PER_SEC, therefore nanos is within the valid range
Duration { secs, nanos: unsafe { Nanoseconds(nanos) } }
}
}
/// Creates a new `Duration` from the specified number of whole seconds.