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factor::table: Coalesce accesses to the factors table

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~5.6% faster
This commit is contained in:
nicoo 2020-06-16 02:29:22 +02:00
parent c97c98bd2b
commit b956e632e1
1 changed files with 5 additions and 1 deletions
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6
src/uu/factor/src/table.rs
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@ -26,14 +26,18 @@ pub(crate) fn factor(mut num: u64) -> (Factors, u64) {
// if (num * inv) mod 2^64 <= ceil, then prime divides num
// See https://math.stackexchange.com/questions/1251327/
// for a nice explanation.
let mut k = 0;
loop {
let Wrapping(x) = Wrapping(num) * Wrapping(inv);
// While prime divides num
if x <= ceil {
num = x;
factors.push(prime);
k += 1;
} else {
if k > 0 {
factors.add(prime, k);
}
break;
}
}