Ticket #4193: hashtable_hint_size_bittwiddle.dpatch

Thu Jul 22 14:07:26 PDT 2010  
  * Allow Data.HashTable construction with user-supplied size
  
  This avoids some resizing for users who know they will be inserting a
  lot of data.
  
  http://hackage.haskell.org/trac/ghc/ticket/4193

New patches:

[Allow Data.HashTable construction with user-supplied size
**20100722210726
 Ignore-this: bd54880bb16a106a992f03b040dc4164
 
 This avoids some resizing for users who know they will be inserting a
 lot of data.
 
 http://hackage.haskell.org/trac/ghc/ticket/4193
] {
hunk ./Data/HashTable.hs 22
 
 module Data.HashTable (
         -- * Basic hash table operations
-        HashTable, new, insert, delete, lookup, update,
+        HashTable, new, newHint, insert, delete, lookup, update,
         -- * Converting to and from lists
         fromList, toList,
         -- * Hash functions
hunk ./Data/HashTable.hs 286
   table <- newIORef ht
   return (HashTable { tab=table, hash_fn=hash, cmp=cmpr })
 
+{- 
+   bitTwiddleSameAs takes as arguments positive Int32s less than maxBound/2 and 
+   returns the smallest power of 2 that is greater than or equal to the 
+   argument.
+   http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
+-}
+bitTwiddleSameAs :: Int32 -> Int32
+bitTwiddleSameAs v0 = 
+    let v1 = v0-1
+        v2 = v1 .|. (v1`shiftR`1)
+        v3 = v2 .|. (v2`shiftR`2)
+        v4 = v3 .|. (v3`shiftR`4)
+        v5 = v4 .|. (v4`shiftR`8)
+        v6 = v5 .|. (v5`shiftR`16)
+    in v6+1
+
+{-
+  powerOver takes as arguments Int32s and returns the smallest power of 2 
+  that is greater than or equal to the argument if that power of 2 is 
+  within [tABLE_MIN,tABLE_MAX]
+-}
+powerOver :: Int32 -> Int32
+powerOver n = 
+    if n <= tABLE_MIN
+    then tABLE_MIN
+    else if n >= tABLE_MAX
+         then tABLE_MAX
+         else bitTwiddleSameAs n 
+
+-- | Creates a new hash table with the given minimum size.
+newHint
+  :: (key -> key -> Bool)    -- ^ @eq@: An equality comparison on keys
+  -> (key -> Int32)          -- ^ @hash@: A hash function on keys
+  -> Int                     -- ^ @minSize@: initial table size
+  -> IO (HashTable key val)  -- ^ Returns: an empty hash table
+
+newHint cmpr hash minSize = do
+  recordNew
+  -- make a new hash table with a single, empty, segment
+  let mask = powerOver $ fromIntegral minSize
+  bkts <- newMutArray (0,mask) []
+
+  let
+    kcnt = 0
+    ht = HT {  buckets=bkts, kcount=kcnt, bmask=mask }
+
+  table <- newIORef ht
+  return (HashTable { tab=table, hash_fn=hash, cmp=cmpr })
+
 -- -----------------------------------------------------------------------------
 -- Inserting a key\/value pair into the hash table
 
}

Context:

[add module intro from Haskell 2010
Simon Marlow <marlowsd@gmail.com>**20100714115853
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] 
[document exception-overriding behaviour in withFile
Simon Marlow <marlowsd@gmail.com>**20100714104107
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] 
[doc: use "finalizer" consistently
Simon Marlow <marlowsd@gmail.com>**20100714103649
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] 
[clarify meaning of bit
Simon Marlow <marlowsd@gmail.com>**20100714103310
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] 
[note shortcutting behaviour of any/all/elem
Simon Marlow <marlowsd@gmail.com>**20100714103304
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] 
[add cast{C,U}CharToChar and castCharTo{C,U}Char, from Haskell 2010
Simon Marlow <marlowsd@gmail.com>**20100713132515
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] 
[mention that IntPtr and WordPtr can be marshalled to/from intptr_t and uintptr_t
Simon Marlow <marlowsd@gmail.com>**20100713132403
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] 
[Partial fix for Trac #4136
simonpj@microsoft.com**20100707135725
 Ignore-this: 9548eeb3187d9779d4e5c858a0f35354
 
 In 'choose' (which is a library function designed specifically
 to support derived instances of Read), we must match Symbol
 as well as Ident, for nullary constructors that (wierdly) are
 symbols.
] 
[Fix typo in documentation
Simon Hengel <simon.hengel@wiktory.org>**20100711141648
 Ignore-this: c052dd8a681832ef598a323ad55eae3a
] 
[Remove duplicated word in documentation
Simon Hengel <simon.hengel@wiktory.org>**20100711072703
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] 
[Allow nhc98 to cope with recent changes to Control.Exception.
Malcolm.Wallace@me.com**20100710170940] 
[ New asynchronous exception control API (base parts)
Simon Marlow <marlowsd@gmail.com>**20100708152735
 Ignore-this: 71a4811804f04259f1fe739f8863beaf
   
 As discussed on the libraries/haskell-cafe mailing lists
   http://www.haskell.org/pipermail/libraries/2010-April/013420.html
 
 This is a replacement for block/unblock in the asychronous exceptions
 API to fix a problem whereby a function could unblock asynchronous
 exceptions even if called within a blocked context.
 
 The new terminology is "mask" rather than "block" (to avoid confusion
 due to overloaded meanings of the latter).
 
 The following is the new API; the old API is deprecated but still
 available for the time being.
 
 Control.Exception
 -----------------
 
 mask  :: ((forall a. IO a -> IO a) -> IO b) -> IO b
 mask_ :: IO a -> IO a
 
 uninterruptibleMask :: ((forall a. IO a -> IO a) -> IO b) -> IO b
 uninterruptibleMask_ :: IO a -> IO 
 
 getMaskingState :: IO MaskingState
 
 data MaskingState
   = Unmasked
   | MaskedInterruptible 
   | MaskedUninterruptible
 
 
 Control.Concurrent
 ------------------
 
 forkIOUnmasked :: IO () -> IO ThreadId
] 
[Async-exception safety, and avoid space leaks
Simon Marlow <marlowsd@gmail.com>**20100708145819
 Ignore-this: dbfd0e61551e9e7b4fc1c6fe9b9a83de
 Patch submitted by: Bas van Dijk <v.dijk.bas@gmail.com>
 Modified slightly by me to remove non-functional changes.
] 
[Async-exception safety, and avoid space leaks
Simon Marlow <marlowsd@gmail.com>**20100708103154
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 Patch submitted by: Bas van Dijk <v.dijk.bas@gmail.com>
 Modified slightly by me to remove non-functional changes.
] 
[Fix a few places where we forgot to close the text codecs (#4029)
Simon Marlow <marlowsd@gmail.com>**20100702130210
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] 
[remove docs from Monad that belonged on the instance for MonadPlus IO
Simon Marlow <marlowsd@gmail.com>**20100701154203
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] 
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] 
[unqualify Float and Double
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] 
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] 
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] 
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] 
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Simon Marlow <marlowsd@gmail.com>**20100701112242
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[Fix haddock formatting
Ian Lynagh <igloo@earth.li>**20100625222623] 
[Give nub's complexity in the haddock docs; fixes #4086
Ian Lynagh <igloo@earth.li>**20100625222059] 
[correct docs for exitWith: only stdout/stderr are flushed, not all Handles
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[remove extraneous info from docs for Array
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] 
[Use libcharset instead of nl_langinfo(CODESET) if possible.
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] 
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[Moved MonadPlus instance for STM from Control.Monad.STM to GHC.Conc to avoid an orphaned instance
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[Added Applicative and Alternative instances for STM
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[expand Foldable instance for Array
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[Move comment closer to the offending line
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[Ignore the return code of c_fcntl_write again
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] 
[Fix bitrot in IO debugging code
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] 
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] 
[runInUnboundThread: block asynchronous exceptions before installing exception handler
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   4. also, the STM version is faster.
] 
[Tweak docs
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[Put the complexity in the length docs. Fixes trac #3680
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[nhc98 should build Data.Functor.
Malcolm.Wallace@cs.york.ac.uk**20100221163218] 
[Update the exitWith docs
Ian Lynagh <igloo@earth.li>**20100213140004
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] 
[Handle NaN, -Infinity and Infinity in the toRational for Float/Double (#3676)
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[For nhc98, import unsafeInterleaveIO rather than defining it here.
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[Stifle warning about unused return value
benl@cse.unsw.edu.au**20100203025537] 
[fix #3832: use the locale encoding in openTempFile
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[Fix the build: export void, so it doesn't give an unused binding warning
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] 
[Replace the implementation of mergesort with a 2x faster one.
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] 
[Restore previous Data.Typeable.typeOf*Default implementations for non-ghc.
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 Not all compilers have ScopedTypeVariables.
] 
[Add comments about double bounds-checking, and fast paths for rectangular arrays
simonpj@microsoft.com**20091218165655
 Ignore-this: ea0849419dc00927aba4bd410b1cc58d
 
 See Note [Double bounds-checking of index values] for the details.
 
 The fast paths omit the doubled checks for cases we know about
] 
[Fix Trac #3245: memoising typeOf
simonpj@microsoft.com**20091218155117
 Ignore-this: 5a178a7f2222293c5ee0c3c43bd1b625
 
 The performance bug in #3245 was caused by computing the typeRep
 once for each call of typeOf, rather than once for each dictionary
 contruction.  (Computing TypeReps is reasonably expensive, because
 of the hash-consing machinery.)
 
 This is readily fixed by putting the TypeRep construction outside
 the lambda.  (Arguably GHC might have worked that out itself,
 but it involves floating something between a type lambda and a
 value lambda, which GHC doesn't currently do. If it happens a lot
 we could fix that.)
] 
[Mark 'index' as INLINE in GHC.Arr
simonpj@microsoft.com**20091216170441
 Ignore-this: a4df9d8acf496c8e0e9ce5a520509a2a
 
 This makes indexing much faster. See Trac #1216
] 
[Comment the remaining orphan instance modules
Ian Lynagh <igloo@earth.li>**20091206125021] 
[De-orphan Eq/Ord Float/Double
Ian Lynagh <igloo@earth.li>**20091205181238] 
[Add comments to "OPTIONS_GHC -fno-warn-orphans" pragmas
Ian Lynagh <igloo@earth.li>**20091205165854] 
[Data.Either.partitionEithers was insufficiently lazy.
Malcolm.Wallace@cs.york.ac.uk**20091202032807
 Ignore-this: 77e1b3288f66608c71458d8a91bcbe12
 Spotted by Daniel Fischer.
] 
[fix the docs regarding finalizer guarantees
Simon Marlow <marlowsd@gmail.com>**20091130144409
 Ignore-this: d1ab9532c74a002b8075ff60febcbe2d
] 
[x86_64 requires more stack
Malcolm.Wallace@cs.york.ac.uk**20091201033745] 
[check for size < 0 in mallocForeignPtrBytes and friends (#3514)
Simon Marlow <marlowsd@gmail.com>**20091125143822
 Ignore-this: 91077d01da2bbe1dfed5155e8b40da9
] 
[hGetContents: close the handle properly on error
Simon Marlow <marlowsd@gmail.com>**20091125123435
 Ignore-this: bc37ff678acc6e547dc390285e056eb9
 
 When hGetContents caught an error it was closing the handle and then
 throwing the exception, without updating the handle with the new
 closed state.  This lead to a double-closed, which was the cause of
 
 *** glibc detected *** ./Setup: double free or corruption 
 
 when iconv_close was called twice on the decoder.
 
 See http://hackage.haskell.org/trac/hackage/ticket/609
] 
[Fix arities of mapFB and zipFB
Roman Leshchinskiy <rl@cse.unsw.edu.au>**20091126232219
 Ignore-this: c4e14cd0a92622549c86e67237a40865
] 
[Remove an unnecessary -fno-warn-orphans flag
Ian Lynagh <igloo@earth.li>**20091126123404] 
[Tweak layout to work with alternative layout rule
Ian Lynagh <igloo@earth.li>**20091125232349] 
[Tweak layout to be accepted by the alternative layout rul
Ian Lynagh <igloo@earth.li>**20091125194147] 
[Make sure zipWithFB has arity 2
Roman Leshchinskiy <rl@cse.unsw.edu.au>**20091125010003
 Ignore-this: 4cf60c55666f03d22a9f5a6e07f52d36
 
 It gets 2 arguments in the "zipWith" rule but its arity was higher and the new
 inliner didn't inline it sometimes, for instance here:
 
 mpp ::  [Double] -> [Double] -> [Double] -> [Double] -> [Double]
 mpp as bs cs ds = zipWith (*) (zipWith (+) as bs) (zipWith (+) cs ds)
  
 This was a regression vs. 6.10.
] 
[Remove an old comment
Ian Lynagh <igloo@earth.li>**20091124134647] 
[De-orphan the Eq/Ord Integer instances
Ian Lynagh <igloo@earth.li>**20091124133639] 
[Whitespace only
Ian Lynagh <igloo@earth.li>**20091124133421] 
[Derive some more instances, rather than writing them by hand
Ian Lynagh <igloo@earth.li>**20091124011747] 
[We can now derive Ord ()
Ian Lynagh <igloo@earth.li>**20091124011416] 
[De-orphan tuple Eq/Ord instances
Ian Lynagh <igloo@earth.li>**20091123233343] 
[Control.Exception.Base no longer has any orphans
Ian Lynagh <igloo@earth.li>**20091123224905] 
[De-orphan the MonadFix ST instance for GHC
Ian Lynagh <igloo@earth.li>**20091123223544] 
[Rearrange the contents of Control.Monad.ST; no functionality changes
Ian Lynagh <igloo@earth.li>**20091123222702] 
[De-orphan the Eq/Ord [a] instances
Ian Lynagh <igloo@earth.li>**20091123215635] 
[De-orphan the Eq/Ord Char instances
Ian Lynagh <igloo@earth.li>**20091123202253] 
[De-orphan the Eq/Ord Bool instances
Ian Lynagh <igloo@earth.li>**20091123201817] 
[Move Eq/Ord Ordering instances to de-orphan them
Ian Lynagh <igloo@earth.li>**20091123194310] 
[Remove ffi warnings for nhc98.
Malcolm.Wallace@cs.york.ac.uk**20091123063743] 
[Second attempt to fix #1185 (forkProcess and -threaded)
Simon Marlow <marlowsd@gmail.com>**20091111151915
 Ignore-this: fa5f5d5e4e080d4b612a37244f937f9c
 
 Patch 2/2: first patch is to ghc
 
 This time without dynamic linker hacks, instead I've expanded the
 existing rts/Globals.c to cache more CAFs, specifically those in
 GHC.Conc.  We were already using this trick for signal handlers, I
 should have realised before.
 
 It's still quite unsavoury, but we can do away with rts/Globals.c in
 the future when we switch to a dynamically-linked GHCi.
] 
[Rollback #1185 fix
Simon Marlow <marlowsd@gmail.com>**20091106140629
 Ignore-this: cd5667e8474e37e01ba26a1984274811
 
 rolling back:
 
 Tue Nov  3 16:05:40 GMT 2009  Simon Marlow <marlowsd@gmail.com>
   * Fix #1185: restart the IO manager after fork()
   
   This is the libraries/base part of the patch; there is a corresponding
   patch to GHC itself.
   
   The main change is that we now keep track of the IO manager's ThreadId
   in a top-level MVar, and ensureIOManagerIsRunning checks whether a
   previous IO manager thread is alive before starting one.  In the child
   of fork(), we can hence call ensureIOManagerIsRunning to restart the
   IO manager.
 
     M ./GHC/Conc.lhs -46 +44
 
 Wed Nov  4 17:49:45 GMT 2009  Ian Lynagh <igloo@earth.li>
   * Fix the build on Windows
 
     M ./GHC/Conc.lhs -6 +4
] 
[Fix the build on Windows
Ian Lynagh <igloo@earth.li>**20091104174945] 
[Fix #1185: restart the IO manager after fork()
Simon Marlow <marlowsd@gmail.com>**20091103160540
 Ignore-this: 6dc05464f1500104554637f4759738cc
 
 This is the libraries/base part of the patch; there is a corresponding
 patch to GHC itself.
 
 The main change is that we now keep track of the IO manager's ThreadId
 in a top-level MVar, and ensureIOManagerIsRunning checks whether a
 previous IO manager thread is alive before starting one.  In the child
 of fork(), we can hence call ensureIOManagerIsRunning to restart the
 IO manager.
] 
[improve the documentation for throwErrnoIfRetry
Simon Marlow <marlowsd@gmail.com>**20091016112404
 Ignore-this: b77275cacf730e15757946027168f63e
] 
[Don't inline unpackFoldrCString ever
simonpj@microsoft.com**20091029135350
 Ignore-this: 85d672649b1b776efc7e97500b05d4f9
] 
[Inline more default methods
simonpj@microsoft.com**20091029135330
 Ignore-this: 289c44b0afd6d5631c2a4e0664275ca9
 
 Namely Monad: (>>)
        Eq:    (==), (/=)
        Num:   (-), negate
        Real:  quot, rem, div, mod, recip, (/), truncate
        Float: (**), logBase, sqrt, tan, tanh
] 
[Move error messages out of INLINEd default methods
simonpj@microsoft.com**20091029135118
 Ignore-this: 9e35dc947f94827a3529eb53a41575fd
 
 No need to duplicate the error generation!
] 
[Exploit now-working default-method INLINE pragmas for Data.Bits
simonpj@microsoft.com**20091029135041
 Ignore-this: 8adf225f31ca7a3181ee087e9e4fe535
 
 * Add INLINE pragmas to default methods for class Bits
 
 * Remove redundant instance methods elsewhere, now that
   the default method will do the job
] 
[Tidy up and comment imports
simonpj@microsoft.com**20091029134414
 Ignore-this: bf2be31035de975d8995e988933cc940
] 
[Inline foldr and (.) when applied to two arguments not three
simonpj@microsoft.com**20091029134335
 Ignore-this: fccb6f3e90e15f44cb465814be85ede2
 
 The new INLINE story is (by design) arity-sensitive, so we must
 put fewer argument on the LHS for foldr and (.)
] 
[dirUtils.c no longer available
Malcolm.Wallace@cs.york.ac.uk**20091013093833] 
[Make hGetContents throw an exception if an error is encountered
Simon Marlow <marlowsd@gmail.com>**20091012152955
 Ignore-this: 9f7a7176193eab25c9daaacd9261f2de
 
 Strictly speaking this breaks Haskell 98 compatibility, which requires
 hGetContents to just end the lazy stream silently if an error is
 encountered.  However, for a few reasons we think it will make
 everyone's life a bit easier if we make this change
 
  1. Errors will be a lot more common in GHC 6.12.1, in the form
     of Unicode decoding errors.
 
  2. When Haskell 98 was designed, we didn't know how to throw
     exceptions from inside lazy I/O, but now we do.
 
  3. If anyone is actually relying on the previous behaviour, their
     code is arguably broken.
] 
[Re-instate System.Console.Getopt for nhc98 builds.
Malcolm.Wallace@cs.york.ac.uk**20091013092843
 Although it was split out of base a while back, that change was
 reverted for ghc soon afterwards, but nhc98 never noticed.
] 
[Roll back "Another instance of nhc98's strange import semantics."
Ian Lynagh <igloo@earth.li>**20091009185618
 Fri Oct  9 14:50:51 BST 2009  Malcolm.Wallace@cs.york.ac.uk
 GHC (correctly) warns about the unused import, which breaks the validate
 build.
] 
[Roll back "Cope with nhc98's (occasionally-strange) import semantics"
Ian Lynagh <igloo@earth.li>**20091009184704
 Fri Oct  9 14:43:51 BST 2009  Malcolm.Wallace@cs.york.ac.uk
 GHC (correctly) warns about the unused import, which breaks the validate
 build.
] 
[It seems that nhc98 needs defaulting in Data.Fixed.
Malcolm.Wallace@cs.york.ac.uk**20091009135242] 
[Another instance of nhc98's strange import semantics.
Malcolm.Wallace@cs.york.ac.uk**20091009135051] 
[Make Data.Functor compatible with non-GHC compilers.
Malcolm.Wallace@cs.york.ac.uk**20091009134821] 
[Cope with nhc98's (occasionally-strange) import semantics.
Malcolm.Wallace@cs.york.ac.uk**20091009134351] 
[Fix gratuitous breakage of nhc98 in System.IO.
Malcolm.Wallace@cs.york.ac.uk**20091009134001] 
[Fix gratuitous breakage of nhc98 in Control.Exception.Base.
Malcolm.Wallace@cs.york.ac.uk**20091009133615] 
[Fix gratuitous breakage of non-GHC in Data.Fixed.
Malcolm.Wallace@cs.york.ac.uk**20091009133330] 
[Fix gratuitous breakage for non-GHC in Data.Bits.
Malcolm.Wallace@cs.york.ac.uk**20091009133257] 
[Use UTF-32LE instead of UTF32LE
Simon Marlow <marlowsd@gmail.com>**20091006100207
 Ignore-this: 7f881e36543d250ef848c9f60d67655a
 The latter is not recognised by some iconv implementations.
] 
[Strip any Byte Order Mark (BOM) from the front of decoded streams.
Ben.Lippmeier@anu.edu.au*-20090930084229
 Ignore-this: d0d0c3ae87b31d71ef1627c8e1786445
 When decoding to UTF-32, Solaris iconv inserts a BOM at the front
 of the stream, but Linux iconv doesn't. 
] 
[use UTF32BE/UTF32LE instead of UCS-4/UCS-4LE
Simon Marlow <marlowsd@gmail.com>**20091005101554
 Ignore-this: 2aef5e9bec421e714953b7aa1bdfc1b3
] 
[Strip any Byte Order Mark (BOM) from the front of decoded streams.
Ben.Lippmeier@anu.edu.au**20090930084229
 Ignore-this: d0d0c3ae87b31d71ef1627c8e1786445
 When decoding to UTF-32, Solaris iconv inserts a BOM at the front
 of the stream, but Linux iconv doesn't. 
] 
[Add traceEvent :: String -> IO ()
Simon Marlow <marlowsd@gmail.com>**20090925141257
 Ignore-this: 8b1888bbf9682ffba13f815b6000e4b1
 For emitting an event via the RTS tracing framework
] 
[Fix the error message when flushing the read buffer of a non-seekable Handle
Simon Marlow <marlowsd@gmail.com>**20090923090536
 Ignore-this: 4342026df93759d99480f4e13f80a492
] 
[Fix #3534: No need to flush the byte buffer when setting binary mode
Simon Marlow <marlowsd@gmail.com>**20090923090445
 Ignore-this: 625817ed7ae2c12291eb993a99dc640a
] 
[Use let !y = x in .. x .. instead of seq in $! and evaluate (#2273)
Simon Marlow <marlowsd@gmail.com>**20090916140454] 
[make some Applicative functions into methods, and split off Data.Functor (proposal #3335)
Ross Paterson <ross@soi.city.ac.uk>**20090915173109
 Ignore-this: a0cff4de6dfdbcbd56a66101bc4855a9
 
 The following functions
 
     (<$) :: Functor f => a -> f b -> f a
     (*>) :: Applicative f => f a -> f b -> f b
     (<*) :: Applicative f => f a -> f b -> f a
     some :: Alternative f => f a -> f [a]
     many :: Alternative f => f a -> f [a]
 
 are moved into the corresponding classes, with the existing implementations
 as default definitions.  This gives people creating instances the option of
 defining specialized implementations of these functions, though they should
 be equivalent to the default definitions.
 
 Although (<$) is now a method of the Functor class, it is hidden in the
 re-export by the Prelude, Control.Monad and Monad.  The new module
 Data.Functor exposes the full class, plus the function (<$>).  These are
 also re-exported by Control.Applicative.
] 
[On Windows, use the console code page for text file encoding/decoding.
Judah Jacobson <judah.jacobson@gmail.com>**20090913022126
 Ignore-this: 86c2f2db8ef92b751599795d3195187b
 
 We keep all of the code page tables in the module
 GHC.IO.Encoding.CodePage.Table.  That file was generated automatically
 by running codepages/MakeTable.hs; more details are in the comments at the
 start of that script.
 
 Storing the lookup tables adds about 40KB to each statically linked executable;
 this only increases the size of a "hello world" program by about 7%.
 
 Currently we do not support double-byte encodings (Chinese/Japanese/Korean), since
 including those codepages would increase the table size to 400KB.  It will be
 straightforward to implement them once the work on library DLLs is finished.
] 
[Fix "init" docs: the input list need not be finite. Fixes trac #3465
Ian Lynagh <igloo@earth.li>**20090911210437] 
[Bump base version to 4.2.0.0
Ian Lynagh <igloo@earth.li>**20090911153913] 
[Address #3310
Simon Marlow <marlowsd@gmail.com>**20090830152850
 Ignore-this: 40c7f7c171ee299a83092fd360a952b7
 
  - Rename BlockedOnDeadMVar   -> BlockedIndefinitelyOnMVar
  - Rename BlockedIndefinitely -> BlockedIndefinitelyOnSTM
  - instance Show BlockedIndefinitelyOnMVar is now
      "blocked indefinitely in an MVar operation"
  - instance Show BlockedIndefinitelyOnSTM is now
      "blocked indefinitely in an STM transaction"
 
 clients using Control.OldException will be unaffected (the new
 exceptions are mapped to the old names).  However, for base4-compat
 we'll need to make a version of catch/try that does a similar
 mapping.
] 
[Fix unicode conversion for MSB architectures
Ben.Lippmeier@anu.edu.au**20090830130028
 This fixes the SPARC/Solaris build.
] 
[Fix #3441: detect errors in partial sequences
Simon Marlow <marlowsd@gmail.com>**20090830075909
 Ignore-this: d12a75d95e0cae5eb1555266810ec281
] 
[Fix hWaitForInput
Simon Marlow <marlowsd@gmail.com>**20090827152116
 Ignore-this: 2550e911f1a4d4357a5aa8d1764238ce
 It was erroneously waiting when there were bytes to decode waiting in
 the byte buffer.
] 
[fix debugging code
Simon Marlow <marlowsd@gmail.com>**20090827150628
 Ignore-this: e1c82fdc19a22e247cd69ff6fa11921d
] 
[Allow for configurable iconv include and library locations.
Matthias Kilian <kili@outback.escape.de>**20090826154406
 Ignore-this: be95fab611a5534cf184b508964ed498
 This should help to fix the build on OpenBSD.
] 
[typo in comment
Simon Marlow <marlowsd@gmail.com>**20090826085252
 Ignore-this: 1903ee0f354157a6ed3871c100f6b1b9
] 
[un-hide some modules from the Haddock docs
Simon Marlow <marlowsd@gmail.com>**20090825152457
 Ignore-this: dce6606f93cf977fb24ebe99082dfa62
] 
[Apply fix for #1548, from squadette@gmail.com
Simon Marlow <marlowsd@gmail.com>**20090819120700
 Ignore-this: 31c237c46a6445f588ed4b8c51bb6231
] 
[improvements to Data.Fixed: instances for Typeable and Data, more predefined types
Ashley Yakeley <ashley@semantic.org>**20090812055058
 Ignore-this: feeece36d5632f02a05d137d2a39ab78
] 
[Fix "Cabal check" warnings
Ian Lynagh <igloo@earth.li>**20090811215856] 
[Add a GHC.Constants module; fixes trac #3094
Ian Lynagh <igloo@earth.li>**20090809183252] 
[Apply proposal #3393
Ian Lynagh <igloo@earth.li>**20090809134717
 Add openTempFileWithDefaultPermissions and
 openBinaryTempFileWithDefaultPermissions.
] 
[Add some more C wrappers; patch from Krister Walfridsson
Ian Lynagh <igloo@earth.li>**20090807200631
 Fixes 21 testsuite errors on NetBSD 5.99.
] 
[Fixing configure for autoconf 2.64
Alexander Dunlap <alexander.dunlap@gmail.com>**20090805060748
 Ignore-this: 992ab91ae3d68c12dbb265776e33e243
] 
[add INLINE toList
Ross Paterson <ross@soi.city.ac.uk>**20090806142853
 Ignore-this: aba16aabb17d5dca44f15d188945680e
 
 In anticipation of the fixing of #2353.
] 
[fix a copyright
Simon Marlow <marlowsd@gmail.com>**20090805134045
 Ignore-this: b0ffbdd38fbba121e8bcba37c4082a60
] 
[Tweak the BufferedIO class to enable a memory-mapped file implementation
Simon Marlow <marlowsd@gmail.com>**20090805134036
 Ignore-this: ec67d7a0a6d977438deaa342503f77e0
 We have to eliminate the assumption that an empty write buffer can be
 constructed by setting the buffer pointers to zero: this isn't
 necessarily the case when the buffer corresponds to a memory-mapped
 file, or other in-memory device implementation.
] 
[Deprecate Control.OldException
Ian Lynagh <igloo@earth.li>**20090804143910] 
[Windows build fix, following RTS tidyup
Simon Marlow <marlowsd@gmail.com>**20090803131121
 Ignore-this: ce862fb91c2b234211a8757f98690778
] 
[Updates to follow the RTS tidyup
Simon Marlow <marlowsd@gmail.com>**20090801220743
 Ignore-this: 6e92412df93a66c12d75344053d5634
 C functions like isDoubleNaN moved here (primFloat.c)
] 
[Add integer-simple as a build option
Ian Lynagh <igloo@earth.li>**20090722013151] 
[Use shift[LR]Integer in the Bits Integer instance
Ian Lynagh <igloo@earth.li>**20090721222440] 
[depend directly on integer-gmp, rather than indirecting through integer
Ian Lynagh <igloo@earth.li>**20090721185228] 
[Move the instances of Functor and Monad IO to GHC.Base, to avoid orphans
Simon Marlow <marlowsd@gmail.com>**20090722102130
 Ignore-this: a7d85ac0025d559674249de0108dbcf4
] 
[move "instance Exception Dynamic" so it isn't an orphan
Simon Marlow <marlowsd@gmail.com>**20090721093854
 Ignore-this: 5ede91ecfec2112c91b699d4de87cd02
] 
[Improve the index checking for array accesses; fixes #2120 #2669
Ian Lynagh <igloo@earth.li>**20090719153228
 As well as checking that offset we are reading is actually inside the
 array, we now also check that it is "in range" as defined by the Ix
 instance. This fixes confusing behaviour (#2120) and improves some error
 messages (#2669).
] 
[Make chr say what its argument was, if it's a bad argument
Ian Lynagh <igloo@earth.li>**20090718151049] 
[remove unused warning
Simon Marlow <marlowsd@gmail.com>**20090715124416
 Ignore-this: 31f613654089d0f4a44363946087b41e
] 
[warning fix: -fno-implicit-prelude -> -XNoImplicitPrelude
Simon Marlow <marlowsd@gmail.com>**20090715122839
 Ignore-this: dc8957249731d5bcb71c01899e5adf2b
] 
[Add hGetEncoding :: Handle -> IO (Maybe TextEncoding)
Simon Marlow <marlowsd@gmail.com>**20090715122519
 Ignore-this: 14c3eff996db062da1199739781e4708
 as suggested during the discussion on the libraries list
] 
[Add more documentation to mkTextEncoding
Simon Marlow <marlowsd@gmail.com>**20090715122414
 Ignore-this: 97253b2624267df3a246a18121e8ea81
 noting that "//IGNORE" and "//TRANSLIT" suffixes can be used with GNU
 iconv.
] 
[Add the utf8_bom codec
Simon Marlow <marlowsd@gmail.com>**20090715122257
 Ignore-this: 1c9396cd805201fe873a39382ced79c7
 as suggested during the discussion on the libraries list.
] 
[Export Unicode and newline functionality from System.IO; update Haddock docs
Simon Marlow <marlowsd@gmail.com>**20090713113104
 Ignore-this: c3f017a555335aa55d106253393f72e2
] 
[add a comment about the non-workingness of CHARBUF_UTF16
Simon Marlow <marlowsd@gmail.com>**20090707124406
 Ignore-this: 98d00411b68d688b3b4cffc9507b1f35
] 
[Fix build on Windows
Ian Lynagh <igloo@earth.li>**20090711004351] 
[Fix some "warn-unused-do-bind" warnings where we want to ignore the value
Ian Lynagh <igloo@earth.li>**20090710204513] 
[Use throwErrnoIfMinus1_ when calling getrusage
Ian Lynagh <igloo@earth.li>**20090710204221] 
[Remove an unused import
Ian Lynagh <igloo@earth.li>**20090710153345] 
[reportStackOverflow now returns IO ()
Ian Lynagh <igloo@earth.li>**20090710153257
 It used to do "return undefined" to return IO a.
] 
[GHC.Conc.reportError now returns IO ()
Ian Lynagh <igloo@earth.li>**20090710152646
 It used to return IO a, by "return undefined".
] 
[Fix some "warn-unused-do-bind" warnings where we want to ignore the value
Ian Lynagh <igloo@earth.li>**20090710152526] 
[Minor SampleVar refactoring
Ian Lynagh <igloo@earth.li>**20090710151438] 
[Fix "warn-unused-do-bind" warnings in GHC/IO/Handle/Text.hs
Ian Lynagh <igloo@earth.li>**20090710122905] 
[Fix some "warn-unused-do-bind" warnings where we just want to ignore the result
Ian Lynagh <igloo@earth.li>**20090710005638] 
[Use the result of writeCharBuf in GHC/IO/Encoding/Latin1.hs too
Ian Lynagh <igloo@earth.li>**20090710004032] 
[Minor code tidyups in GHC.Conc
Ian Lynagh <igloo@earth.li>**20090710003801] 
[Fix "warn-unused-do-bind" warning in GHC.Conc
Ian Lynagh <igloo@earth.li>**20090710003530
 If we fail to communicate with the IO manager then we print a warning
 using debugErrLn from the ghc-prim package.
] 
[Fix "warn-unused-do-bind" warnings in System.Posix.Internals
Ian Lynagh <igloo@earth.li>**20090709164546] 
[Fix "warn-unused-do-bind" warnings where we really do want to ignore the result
Ian Lynagh <igloo@earth.li>**20090709163912] 
[Add back imports needed on Windows
Ian Lynagh <igloo@earth.li>**20090707181924] 
[Remove unused imports
Ian Lynagh <igloo@earth.li>**20090707115810] 
[Remove unused imports from base
simonpj@microsoft.com**20090706111842
 Ignore-this: f9b5f353e3bb820f787c56d615b28765
 
 These unused imports are detected by the new unused-import code
 
] 
[Use the result of writeCharBuf
Simon Marlow <marlowsd@gmail.com>**20090706133303
 Ignore-this: 52288dd559bf4c4f313df6197091d935
   
 This only makes a difference when CHARBUF_UTF16 is in use, which it
 normally isn't.  I suspect CHARBUF_UTF16 doesn't currently work for
 other reasons (CHARBUF_UTF16 was an experiment before I wrote the
 GHC.IO.Encoding.UTF* codecs), but this patch at least makes it
 slightly closer to working.
] 
[Remove some cruft from Data.HashTable
Ian Lynagh <igloo@earth.li>**20090706181630] 
[Add 'eof' to Text.ParserCombinators.ReadP
simonpj@microsoft.com**20090706111801
 Ignore-this: 2aea7b848e00c894761bc4011adaa95d
 
 Add a ReadP parser that succeeds at the end of input. Very useful!
 
] 
[Don't export CLDouble for GHC; fixes trac #2793
Ian Lynagh <igloo@earth.li>**20090705155120
 We never really supported CLDouble (it was a plain old double underneath),
 and pretending that we do does more harm than good.
] 
[a byte between 0x80 and 0xBF is illegal immediately (#3341)
Simon Marlow <marlowsd@gmail.com>**20090702081415
 Ignore-this: dc19ef59a1a21118d5a7dd38aa2f611c
] 
[avoid a warning
Simon Marlow <marlowsd@gmail.com>**20090630084134
 Ignore-this: c92a45ee216faf01327feae9fe06d6e2
] 
[Add a wrapper for libiconv.
Matthias Kilian <kili@outback.escape.de>**20090629183634
 Ignore-this: 23c6047c0d71b745b495cc223574a47f
] 
[#include <sys/times.h> if we have it (should fix build problems)
Simon Marlow <marlowsd@gmail.com>**20090629085351
 Ignore-this: a35e93b37ca9595c73460243180f4b9d
] 
[set binary mode for existing FDs on Windows (fixes some GHCi test failures)
Simon Marlow <marlowsd@gmail.com>**20090626120522
 Ignore-this: 580cf636e9c77d8427aff6861d089481
] 
[Move directory-related stuff to the unix package
Simon Marlow <marlowsd@gmail.com>**20090625120325
 Ignore-this: b997b3cbce0a46ca87ad825bbdc0a411
 now that it isn't used on Windows any more.
] 
[TAG 2009-06-25
Ian Lynagh <igloo@earth.li>**20090625160056] 
Patch bundle hash:
52d6402612e0fec9e5b204bc1a959e25d316ac43