#6156: Optimiser bug on linux-powerpc
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Reporter: erikd | Owner: pcapriotti
Type: bug | Status: new
Priority: normal | Milestone: 7.6.1
Component: Compiler | Version: 7.4.1
Resolution: | Keywords:
Os: Linux | Architecture: powerpc
Failure: Incorrect result at runtime | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Comment(by erikd):
Simplified test case for this bug:
{{{
import Data.Bits
import Data.Word
w64tow32 :: Word64 -> (Word32, Word32)
w64tow32 w =
(fromIntegral (w `shiftR` 32), fromIntegral (w .&. 0xffffffff))
main :: IO ()
main =
if w64tow32 1238988323332265734 == (288474448,3440613126)
then putStrLn "Pass"
else putStrLn "Fail"
}}}
Compling without optimisation (or with -O0) passes, with -O1 or above it
fails.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6156#comment:22>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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