#9407: Program produces different output when compiled with -O -------------------------------------+------------------------------------- Reporter: arotenberg | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 (amd64) Type of failure: Incorrect | Difficulty: Unknown result at runtime | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): OK so it seems likely to be something to do with 64-bit floating-point arithmetic. I wonder if it makes a difference whether you use the native code generator or LLVM? Does anyone feel able to investigate? The program isn't very big, and has no dependencies other than `Prelude`. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9407#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler