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Some micro-optimizations in BitVec.

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Chris Fallin
2021-05-06 16:19:38 -07:00
parent 1a7a0c5e3d
commit 747c56c2c3
1 changed files with 6 additions and 4 deletions
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10
src/bitvec.rs
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@@ -83,14 +83,16 @@ impl BitVec {
let last_idx = other.bits.len() - 1; let last_idx = other.bits.len() - 1;
self.ensure_idx(last_idx); self.ensure_idx(last_idx);
let mut changed = false; let mut changed = 0;
for (self_word, other_word) in self.bits.iter_mut().zip(other.bits.iter()) { for (self_word, other_word) in self.bits.iter_mut().zip(other.bits.iter()) {
if *other_word & !*self_word != 0 { if *other_word == 0 {
changed = true; // Avoid cache misses in `self` if `other` is zeroes.
continue;
} }
changed |= *other_word & !*self_word;
*self_word |= *other_word; *self_word |= *other_word;
} }
changed changed != 0
} }
pub fn and(&mut self, other: &Self) { pub fn and(&mut self, other: &Self) {