#4867: ghci displays negative floats incorrectly (was: Incorrect result from
trig
functions)
-------------------------------+--------------------------------------------
Reporter: gwright | Owner: gwright
Type: bug | Status: new
Priority: high | Milestone: 7.0.2
Component: GHCi | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: MacOS X | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
-------------------------------+--------------------------------------------
Comment(by altaic):
Not sure if you had already discovered this, but it appears the bug is
limited to `Double`, while `Float` appears to be fine:
{{{
Prelude> -1.0 :: Float
-1.0
Prelude> -1.0 :: Double
-3.666940035476786e76
}}}
Oddly, the transform that's producing the garbage value is reversible
(guessing there'd be loss of bits at extremes):
{{{
Prelude> -1.0 :: Double
-3.666940035476786e76
Prelude> -3.666940035476786e76 :: Double
-1.0
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4867#comment:26>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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