perf: Only process changed obligations in ObligationForest#69218

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Marwes wants to merge 25 commits intorust-lang:masterfrom Marwes:fulfill_next

+1,899-455

Commits on Oct 26, 2020

perf: Avoid allocating a new Vec on each stall
Markus Westerlind
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perf: Only process changed obligations in ObligationForest
Markus Westerlind
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perf: Avoid logging unifications that ObligationForest do not watch
Markus Westerlind
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refactor: Prefer copy_from_slice instead of explicit loop
Markus Westerlind
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Optimize ModifiedSet for faster snapshot/rollback
Markus Westerlind
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refactor: Make UnifyLog have lower overhead snapshots
Markus Westerlind
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perf: No need to track modified variables in a bitset
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Start reading where ModifiedSet currently is
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Rebase on top of undo_log unification
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Clear the modified set once no snapshots exist
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Document the additions
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refactor: Simplify obligation_forest
Markus Westerlind
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perf: No need to resolve variables in fulfillment
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Document obligation forest changes
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Restore clearing of stalled_on before process_obligation
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fix: Avoid dropping and re-registering offsets in the obligation forest

Marwes
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Markus Westerlind
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Ensure that predicates that change are marked as done

Marwes
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Markus Westerlind
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Restore alternative predicates for obligation forest

Marwes
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Markus Westerlind
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Fix rebase
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test
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a
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a
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a
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Always use the simple obligation forest
Markus Westerlind
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Commits on Oct 27, 2020

Hack out unify log for perf
Markus Westerlind
committed