#14377: some results not expected with the addition -------------------------------------+------------------------------------- Reporter: vanto | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by svenpanne): A tiny bit of googling would have showed that the problem is not easy at all, see e.g. the 2nd part of https://cs.stackexchange.com/a/81039 or the 2nd volume of Knuth's TAOCP (Radix Conversions). Apart from the fact that numeric algorithms are notoriously hard, there are tradeoffs here, e.g. speed vs. "minimality" of the resulting string. Different implementations just choose different points in the design space, so GHC's behavior is not a bug at all and I propose to close this ticket. Remember: If there was a single, universally "right" way to convert binary floats to a decimal string, people probably wouldn't write papers/blogs/etc. about it for several decades... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14377#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler