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The add_missing_tags() method currently has quadratic behavior. This is due to a linear number (based on number of tags T) of calls to in_merge_bases_many, which has linear performance (based on number of commits C in the repository). Replace this O(T * C) algorithm with an O(T + C) algorithm by using get_reachable_subset(). We ignore the return list and focus instead on the reachable_flag assigned to the commits we care about, because we need to interact with the tag ref and not just the commit object. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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