#11989: Performance bug reading large-exponent float without explicit type -------------------------------------+------------------------------------- Reporter: bpearlmutter | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 7.10.3 System | Keywords: | Operating System: Linux Architecture: x86_64 | Type of failure: Runtime (amd64) | performance bug Test Case: 1e1000000 :: | Blocked By: (RealFloat a => a) | Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ $ time echo '1e700000' | ghci GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help Prelude> Infinity Prelude> Leaving GHCi. real 1m25.799s user 0m20.828s sys 0m9.624s $ time echo '1e700000::Double' | ghci GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help Prelude> Infinity Prelude> Leaving GHCi. real 0m0.196s user 0m0.120s sys 0m0.032s $ time echo 1e-800000 | ghci GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help Prelude> Killed real 2m8.879s user 0m6.684s sys 0m10.256s }}} Giving an explicit type `(RealFloat a => a)` doesn't make any difference. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11989 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler