#10067: The Read Integer instance is too slow -------------------------------------+------------------------------------- Reporter: redneb | Owner: Type: feature request | Status: closed Priority: normal | Milestone: 7.12.1 Component: Core Libraries | Version: 7.11 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D645 -------------------------------------+------------------------------------- Comment (by redneb): Yes, as I mentioned above, the `Read` instance of `Natural` relies on the `Read` instance of `Integer` so we get a speed-up for `Natural` as well. Unfortunately, this is not the case for the lexers from `Text.Read.Lex`, namely `readIntP`, `readOctP`, `readDecP`, `readHexP`: they only use the new algorithm for `Integer` but not for `Natural`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10067#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler