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Codegen optimization is my passion

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This commit is contained in:
Bert Peters
2023-01-28 22:32:42 +01:00
parent c35858239f
commit e914c17f81
1 changed files with 8 additions and 3 deletions
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11
2022/src/day19.rs
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@@ -1,4 +1,3 @@
use std::array;
use std::cmp::Ordering;
use std::collections::BinaryHeap;
@@ -126,8 +125,14 @@ impl BluePrint {
continue;
}
let resources_after =
array::from_fn(|i| resources[i] + machines[i] * built_after - costs[i]);
// Ideally, would be written as a nice `array::from_fn`. It turns out that codegen
// for `array::from_fn` is very bad, and writing it out into this for loop reduces
// time taken by approximately 100%.
let mut resources_after = [0; 3];
for i in 0..3 {
resources_after[i] = resources[i] + machines[i] * built_after - costs[i];
}
let time_after = time_left - built_after;
if element == Mineral::Geode as usize {