#5623: GHC 7.2.1 Performance Regression: Vector
---------------------------------+------------------------------------------
Reporter: dterei | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Runtime performance bug
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Comment(by rl):
Come to think of it, here is a much simpler example:
{{{
foo :: Ptr Float -> IO Float
foo p = liftM2 (+) (peekElemOff q 0) (peekElemOff q 1)
where
q = p `plusPtr` 4
}}}
Again, the HEAD computes `q` twice. This looks like a rather bad bug to
me, I hope this will be fixed in time for 7.4!
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5623#comment:2>
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