https://issues.dlang.org/show_bug.cgi?id=16513
Issue ID: 16513 Summary: Speed up TemplateInstance.findExistingInstance, hash by mangling Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nob...@puremagic.com Reporter: c...@dawg.eu We still have a few reports about extremely slow TemplateInstance.findExistingInstance performance. What can be seen in profiles is an excessive amount of TemplateInstance comparisons for lookups in the hash table that eat ~20% of the compilation time. Maybe we're producing an unsuited hash that isn't order dependent? Or it's just an extreme number of instances with many arguments? Still have to investigate further, but since issue 7469 got fixed we might now hash by the mangling of the template (.getIdent) instead of doing an expensive arrayObjectMatch on RootObjects (using a "virtual" match function). --