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time: use bit manipulation instead of modulo #4480

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Feb 15, 2022
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time: use bit manipulation instead of modulo #4480

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561a665
time: use bit manipulation instead of modulo
samueltardieu Feb 8, 2022
bc4059b
time: add comment to explain the bit manipulation
samueltardieu Feb 8, 2022
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5 changes: 3 additions & 2 deletions tokio/src/time/driver/wheel/level.rs
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Expand Up @@ -143,8 +143,9 @@ impl Level {
let level_range = level_range(self.level);
let slot_range = slot_range(self.level);

// TODO: This can probably be simplified w/ power of 2 math
let level_start = now - (now % level_range);
// Compute the start date of the current level by masking the low bits
// of `now` (`level_range` is a power of 2).
let level_start = now & !(level_range - 1);
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let mut deadline = level_start + slot as u64 * slot_range;

if deadline <= now {
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