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Inline Duration construction into Duration::from_{millis,micros,nanos}

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Noa 2024-05-17 18:37:59 -05:00
parent 35522a9e09
commit 53b317710d
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1 changed files with 21 additions and 3 deletions
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24
library/core/src/time.rs
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@ -260,7 +260,13 @@ pub const fn from_secs(secs: u64) -> Duration {
#[inline]
#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
pub const fn from_millis(millis: u64) -> Duration {
Duration::new(millis / MILLIS_PER_SEC, ((millis % MILLIS_PER_SEC) as u32) * NANOS_PER_MILLI)
let secs = millis / MILLIS_PER_SEC;
let subsec_millis = (millis % MILLIS_PER_SEC) as u32;
// SAFETY: (x % 1_000) * 1_000_000 < 1_000_000_000
// => x % 1_000 < 1_000
let subsec_nanos = unsafe { Nanoseconds(subsec_millis * NANOS_PER_MILLI) };
Duration { secs, nanos: subsec_nanos }
}
/// Creates a new `Duration` from the specified number of microseconds.
@ -280,7 +286,13 @@ pub const fn from_millis(millis: u64) -> Duration {
#[inline]
#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
pub const fn from_micros(micros: u64) -> Duration {
Duration::new(micros / MICROS_PER_SEC, ((micros % MICROS_PER_SEC) as u32) * NANOS_PER_MICRO)
let secs = micros / MICROS_PER_SEC;
let subsec_micros = (micros % MICROS_PER_SEC) as u32;
// SAFETY: (x % 1_000_000) * 1_000 < 1_000_000_000
// => x % 1_000_000 < 1_000_000
let subsec_nanos = unsafe { Nanoseconds(subsec_micros * NANOS_PER_MICRO) };
Duration { secs, nanos: subsec_nanos }
}
/// Creates a new `Duration` from the specified number of nanoseconds.
@ -305,7 +317,13 @@ pub const fn from_micros(micros: u64) -> Duration {
#[inline]
#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
pub const fn from_nanos(nanos: u64) -> Duration {
Duration::new(nanos / (NANOS_PER_SEC as u64), (nanos % (NANOS_PER_SEC as u64)) as u32)
const NANOS_PER_SEC: u64 = self::NANOS_PER_SEC as u64;
let secs = nanos / NANOS_PER_SEC;
let subsec_nanos = (nanos % NANOS_PER_SEC) as u32;
// SAFETY: x % 1_000_000_000 < 1_000_000_000
let subsec_nanos = unsafe { Nanoseconds(subsec_nanos) };
Duration { secs, nanos: subsec_nanos }
}
/// Creates a new `Duration` from the specified number of weeks.