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[rustc_data_structures] Use partition_point to find slice range end. #114231

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Merged
merged 2 commits into from
Jan 18, 2024
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[rustc_data_structures] Use partition_point to find slice range end. #114231

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9ced089
[rustc_data_structures] Use partition_point to find binary_search_sl…
ttsugriy Jul 30, 2023
97bc528
Remove invariant comments
ttsugriy Nov 5, 2023
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25 changes: 4 additions & 21 deletions compiler/rustc_data_structures/src/binary_search_util/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,27 +18,10 @@ where
return &[];
};

// Now search forward to find the *last* one.
let mut end = start;
let mut previous = start;
let mut step = 1;
loop {
end = end.saturating_add(step).min(size);
if end == size || key_fn(&data[end]) != *key {
break;
}
previous = end;
step *= 2;
}
step = end - previous;
while step > 1 {
let half = step / 2;
let mid = end - half;
if key_fn(&data[mid]) != *key {
end = mid;
}
step -= half;
}
// Find the first entry with key > `key`. Skip `start` entries since
// key_fn(&data[start]) == *key
let offset = start + 1;
let end = data[offset..].partition_point(|x| key_fn(x) <= *key) + offset;

&data[start..end]
}