#7507: loop fusion not working for Int32, Int64 as it does for Int ?
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Reporter: j.waldmann | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: None/Unknown | Blockedby:
Blocking: | Related:
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here is some code that works for Int, but gives me Stack Overflow for
arguments 18 .. 24, and Out of memory for 25. (Just change the
type annotation in main.)
{{{
import Data.Int
import System.Environment
bitcount x = if x > 0
then let (d,m) = divMod x 2 in bitcount d + m
else 0
main = do
[ arg ] <- getArgs
print $ sum $ map bitcount
[ 0 :: Int64 .. 2^read arg - 1 ]
}}}
https://github.com/haskell-distributed/distributed-
process/issues/91#issuecomment-11468092
Not sure whether it's a bug, but it's annoying. There is no conceptual
difference between these numerical types, so I shouldn't have to rewrite
my program when switching between them.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7507>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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