#5683: bug in signum function -------------------------------------+------------------------------------- Reporter: tristes_tigres | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.6.1 Component: Prelude | Version: 7.0.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by thomie): This was fixed in commit d9a20573f473cc7389004470999b8a318aa6b3f2: {{{ Author: Alexander Berntsen <alexander@plaimi.net> Date: Mon Aug 18 21:43:33 2014 -0500 Make Prelude.signum handle -0.0 correctly (#7858) Summary: Make the `Float` and `Double` implementations of `signum` handle -0.0 correctly per IEEE-754. This, together with "Make Prelude.abs handle -0.0 correctly (#7858)", fixes Trac #7858. Depends on D145 Signed-off-by: Alexander Berntsen <alexander@plaimi.net> Test Plan: signum of (-0.0) should be (-0.0) not 0.0. Test program: main = putStrLn $ p ++ " " ++ n where f = show . signum p = f (-0.0 :: Double) n = f (0.0 :: Double) Reviewers: ekmett, hvr, rwbarton, austin Reviewed By: austin Subscribers: phaskell, simonmar, relrod, ezyang, carter Differential Revision: https://phabricator.haskell.org/D148 GHC Trac Issues: #7858 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5683#comment:14> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler