#7858: Fix definitions of abs/signum for Floats/Doubles -------------------------------------+------------------------------------- Reporter: lerkok | Owner: bernalex Type: bug | Status: patch Priority: normal | Milestone: 7.10.1 Component: | Version: 7.6.3 libraries/base | Keywords: floating point Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: #9238 None/Unknown | Test Case: | Blocking: | Differential Revisions: Phab:D145 | -------------------------------------+------------------------------------- Comment (by Austin Seipp <austin@…>): In [changeset:"6f6ee6eaa348b1a4815190c4d526d5c81c264fa7/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="6f6ee6eaa348b1a4815190c4d526d5c81c264fa7" Make Prelude.abs handle -0.0 correctly (#7858) Summary: Make the `Float` and `Double` implementations of `abs` handle -0.0 correctly per IEEE-754. abs (-0.0::Float) and abs (-0.0::Double) previously returned -0.0, when they should return 0.0. This patch fixes this. Signed-off-by: Alexander Berntsen <alexander@plaimi.net> Test Plan: abs (-0.0::Double) should = 0.0 instead of (-0.0) Reviewers: ekmett, hvr, austin, rwbarton Reviewed By: austin, rwbarton Subscribers: phaskell, trofi, simonmar, relrod, ezyang, carter Differential Revision: https://phabricator.haskell.org/D145 GHC Trac Issues: #7858 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7858#comment:13> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler