region_infer: BitMatrix representation of region values #16
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nikomatsakis
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Nov 22, 2017
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| // Find every region `o` such that `fr: o` | ||
| // (because `fr` includes `end(o)`). | ||
| for &outlived_fr in &fr_value.free_regions { | ||
| for outlived_fr in fr_value.filter(|&i| i < self.num_free_regions) { |
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I think take_while would be better -- it would stop the loop sooner
| for &fr in &from_region.free_regions { | ||
| changed |= to_region.free_regions.insert(fr); | ||
| let free_region_indices = inferred_values.iter(from_region.index()) | ||
| .filter(|&i| i < self.num_free_regions).collect::<Vec<_>>(); |
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I think take_while would be more efficient
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| /// The constraints we have accumulated and used during solving. | ||
| constraints: Vec<Constraint>, | ||
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| /// A map from each MIR Location to its column index in | ||
| /// `liveness_constraints`/`inferred_values` | ||
| point_indices: BTreeMap<Location, usize>, |
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It'd be nice to expand this comment to explain that the first N indices are the free regions -- or at least comment on that somewhere.
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Thanks @zackmdavis =) |
zackmdavis
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nikomatsakis
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This should be more efficient than allocating two BTreeSets for every region variable?—as it is written in rust-lang#45670.
nikomatsakis
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Warning: rebased! |
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And merged. |
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@nikomatsakis
This should be more efficient than allocating two BTreeSets for every region variable?—as it is written in rust-lang#45670.
This isn't addressing the question of auxillary methods for
BitMatrix. I'm also not immediately sure what kind of testing is appropriate.