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copies-rust: add smarter approach for merging small mapping with large mapping...
marmoute -
r46744:c94d013e default
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@@ -458,8 +458,8 b' fn add_from_changes('
458 458 /// In case of conflict, value from "major" will be picked, unless in some
459 459 /// cases. See inline documentation for details.
460 460 fn merge_copies_dict<A: Fn(Revision, Revision) -> bool>(
461 minor: TimeStampedPathCopies,
462 major: TimeStampedPathCopies,
461 mut minor: TimeStampedPathCopies,
462 mut major: TimeStampedPathCopies,
463 463 changes: &ChangedFiles,
464 464 oracle: &mut AncestorOracle<A>,
465 465 ) -> TimeStampedPathCopies {
@@ -476,6 +476,51 b' fn merge_copies_dict<A: Fn(Revision, Rev'
476 476 major
477 477 } else if major.is_empty() {
478 478 minor
479 } else if minor.len() * 2 < major.len() {
480 // Lets says we are merging two TimeStampedPathCopies instance A and B.
481 //
482 // If A contains N items, the merge result will never contains more
483 // than N values differents than the one in A
484 //
485 // If B contains M items, with M > N, the merge result will always
486 // result in a minimum of M - N value differents than the on in
487 // A
488 //
489 // As a result, if N < (M-N), we know that simply iterating over A will
490 // yield less difference than iterating over the difference
491 // between A and B.
492 //
493 // This help performance a lot in case were a tiny
494 // TimeStampedPathCopies is merged with a much larger one.
495 for (dest, src_minor) in minor {
496 let src_major = major.get(&dest);
497 match src_major {
498 None => major.insert(dest, src_minor),
499 Some(src_major) => {
500 match cmp_value(&dest, &src_minor, src_major) {
501 MergePick::Any | MergePick::Major => None,
502 MergePick::Minor => major.insert(dest, src_minor),
503 }
504 }
505 };
506 }
507 major
508 } else if major.len() * 2 < minor.len() {
509 // This use the same rational than the previous block.
510 // (Check previous block documentation for details.)
511 for (dest, src_major) in major {
512 let src_minor = minor.get(&dest);
513 match src_minor {
514 None => minor.insert(dest, src_major),
515 Some(src_minor) => {
516 match cmp_value(&dest, src_minor, &src_major) {
517 MergePick::Any | MergePick::Minor => None,
518 MergePick::Major => minor.insert(dest, src_major),
519 }
520 }
521 };
522 }
523 minor
479 524 } else {
480 525 let mut override_minor = Vec::new();
481 526 let mut override_major = Vec::new();
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