loop fusion not working for Int32, Int64 as it does for Int ?
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.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |