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::Before:: - Boot -> PIE (6m3s) - FCoreRedirects::RedirectNameAndValues: 18s ::After:: - Boot -> PIE (5m41s) - FCoreRedirects::RedirectNameAndValues: 5.3s - MatchWildcard=true support has been added to how CoreRedirects are defined in INI files. You may now define OldName="...SomeSuffix", OldName="SomePrefix..." or OldName="...SomeSubstring..." to perform string manipulation based matching for redirects, deprecating MatchSubstring=true - Substring matches are very expensive compared to pure FName matching or even prefix and suffix matching. This expense is problematic since the presence of a substring matching rule can mean that all queries for a particular redirect type, such as package name, will need to perform the substring check even if a substring match is relatively uncommon. To combat this cost, we add a reimplementation of the PM-k, (PredictMatch-8) algorithm. This allows a redirect query to check for substring matches against _all_ possible substrings with a single pass over the redirect query name. The fuzzy matching is designed such that false positives may occur but not false negatives. When a fuzzy match is found we must perform the slow substring match to confirm. However fuzzy matching allows use to dramatically reduce our string scannin. In a case where there were 4 MatchSubstrings, from boot to PIE, we now perform slow substring matches < 0.8% of the time compared to previously. - Replaces `FString` manipulation during redirect queries to instead use a small wrapper type `FNameUtf8String` which provides a small API to allow for FName comparisons, building and ultimately reducing copies. UTF8 is used since we need to ensure we have an encoding that we can keep the same for storing wildcard strings that will match how we query for wildcard matches. UTF8 is byte efficient for ANSI text, which improves fuzzy match prediction. ========================================== Substring Stats Substring Lookups: 24342736 Prediction Hit: 72 Prediction Miss: 213377 ========================================== #jira UE-204063 #rb Matt.Peters [FYI] Francis.Hurteau [CL 31941627 by kevin macaulayvacher in ue5-main branch]