Changelog for ghc-prim-0.7.0

0.7.0 (Jan 2021)

Shipped with GHC 9.0.1
Add known-key cstringLength# to GHC.CString. This is just the C function strlen, but a built-in rewrite rule allows GHC to compute the result at compile time when the argument is known.

In order to support unicode better the following functions in GHC.CString gained UTF8 counterparts:

  unpackAppendCStringUtf8# :: Addr# -> [Char] -> [Char]
  unpackFoldrCStringUtf8# :: Addr# -> (Char -> a -> a) -> a -> a

unpackFoldrCString* variants can now inline in phase [0].

If the folding function is known this allows for unboxing of the Char argument resulting in much faster code.
Renamed the singleton tuple GHC.Tuple.Unit to GHC.Tuple.Solo.

Add primops for atomic exchange:

  atomicExchangeAddrAddr# :: Addr# -> Addr# -> State# s -> (# State# s, Addr# #)
  atomicExchangeWordAddr# :: Addr# -> Word# -> State# s -> (# State# s, Word# #)

Add primops for atomic compare and swap at a given Addr#:

  atomicCasAddrAddr# :: Addr# -> Addr# -> Addr# -> State# s -> (# State# s, Addr# #)
  atomicCasWordAddr# :: Addr# -> Word# -> Word# -> State# s -> (# State# s, Word# #)

Add an explicit fixity for (~) and (~~):
```
  infix 4 ~, ~~
```
Introduce keepAlive# to replace touch# in controlling object lifetime without the soundness issues of the latter (see #17760).

0.6.1 (March 2020)

Shipped with GHC 8.10.1
Add primop for shrinking SmallMutableArray# to GHC.Prim:
```
  shrinkSmallMutableArray# :: SmallMutableArray# s a -> Int# -> State# s -> State# s
```
Note that resizeSmallMutableArray# is not included as as primitive. It has been implemented in library space in GHC.Exts. See the release notes of base.
Added to GHC.Prim:
```
  closureSize# :: a -> Int#
```
Added to GHC.Prim:
```
  bitReverse# :: Word# -> Word#
  bitReverse8# :: Word# -> Word#
  bitReverse16# :: Word# -> Word#
  bitReverse32# :: Word# -> Word#
  bitReverse64# :: Word# -> Word#
```
bitReverse# is a primop that, for a Word of 8, 16, 32 or 64 bits, reverses the order of its bits e.g. 0b110001 becomes 0b100011. These primitives use optimized machine instructions when available.
Add Int# multiplication primop:
```
timesInt2# :: Int# -> Int# -> (# Int#, Int#, Int# #)
```
timesInt2# computes the multiplication of its two parameters and returns a triple (isHighNeeded,high,low) where high and low are respectively the high and low bits of the double-word result. isHighNeeded is a cheap way to test if the high word is a sign-extension of the low word (isHighNeeded = 0#) or not (isHighNeeded = 1#).

0.6.0

Shipped with GHC 8.8.1

Added to GHC.Prim:

  traceBinaryEvent# :: Addr# -> Int# -> State# s -> State# s

0.5.3

Shipped with GHC 8.6.1

Added to GHC.Prim:

  addWordC# :: Word# -> Word# -> (# Word#, Int# #)

unpackClosure# can now unpack any valid Haskell closure. Previously it returned empty pointer and non-pointer arrays for thunks.

Add unaligned bytearray access primops (#4442)

   readWord8ArrayAsChar# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Char# #)
   readWord8ArrayAsAddr# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Addr# #)
   readWord8ArrayAsFloat# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Float# #)
   readWord8ArrayAsDouble# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Double# #)
   readWord8ArrayAsStablePtr# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, StablePtr# #)
   readWord8ArrayAsInt16# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Int16# #)
   readWord8ArrayAsInt32# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Int32# #)
   readWord8ArrayAsInt64# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Int64# #)
   readWord8ArrayAsInt# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Int# #)

   readWord8ArrayAsWord16# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Word16# #)
   readWord8ArrayAsWord32# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Word32# #)
   readWord8ArrayAsWord64# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Word64# #)
   readWord8ArrayAsWord# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Word# #)

   writeWord8ArrayAsChar# :: MutableByteArray# s -> Int# -> Char# -> State# s -> State# s
   writeWord8ArrayAsAddr# :: MutableByteArray# s -> Int# -> Addr# -> State# s -> State# s
   writeWord8ArrayAsFloat# :: MutableByteArray# s -> Int# -> Float# -> State# s -> State# s
   writeWord8ArrayAsDouble# :: MutableByteArray# s -> Int# -> Double# -> State# s -> State# s
   writeWord8ArrayAsStablePtr# :: MutableByteArray# s -> Int# -> StablePtr# -> State# s -> State# s

   writeWord8ArrayAsInt16# :: MutableByteArray# s -> Int# -> Int16# -> State# s -> State# s
   writeWord8ArrayAsInt32# :: MutableByteArray# s -> Int# -> Int32# -> State# s -> State# s
   writeWord8ArrayAsInt64# :: MutableByteArray# s -> Int# -> Int64# -> State# s -> State# s
   writeWord8ArrayAsInt# :: MutableByteArray# s -> Int# -> Int# -> State# s -> State# s

   writeWord8ArrayAsWord16# :: MutableByteArray# s -> Int# -> Word16# -> State# s -> State# s
   writeWord8ArrayAsWord32# :: MutableByteArray# s -> Int# -> Word32# -> State# s -> State# s
   writeWord8ArrayAsWord64# :: MutableByteArray# s -> Int# -> Word64# -> State# s -> State# s
   writeWord8ArrayAsWord# :: MutableByteArray# s -> Int# -> Word# -> State# s -> State# s

0.5.2.0

Shipped with GHC 8.4.1

Added to GHC.Prim:

  compareByteArrays# :: ByteArray# -> Int# -> ByteArray# -> Int# -> Int# -> Int#

Don't allocate a thunk for each unpacked UTF-8 character in unpackCStringUtf8#

0.5.1.1 November 2017

Shipped with GHC 8.2.2
Changed strictness properties of catchRetry# (#14171)

0.5.1.0 July 2017

Shipped with GHC 8.2.1

Added to GHC.Prim:

  fabsDouble# :: Double# -> Double#
  fabsFloat# :: Float# -> Float#
  isByteArrayPinned# :: ByteArray# -> Int#
  isMutableByteArrayPinned# :: MutableByteArray# s -> Int#
  anyToAddr# :: a -> State# (RealWorld) -> (# State# (RealWorld),Addr# #)

New primitives for compact regions in GHC.Prim:

  Compact#
  compactNew#
  compactResize#
  compactContains#
  compactContainsAny#
  compactGetFirstBlock#
  compactGetNextBlock#
  compactAllocateBlock#
  compactFixupPointers#
  compactAdd#
  compactAddWithSharing#
  compactSize#

Generalised noDuplicate# from

  noDuplicate# :: State# (RealWorld) -> State# (RealWorld)

  noDuplicate# :: State# s -> State# s

0.5.0.0

Shipped with GHC 8.0.1
GHC.Classes: new class IP (a :: Symbol) b | a -> b

GHC.Prim: changed type signatures from

  check# :: (State# RealWorld -> (# State# RealWorld, a #)) -> State# RealWorld -> (# State# RealWorld, () #)
  finalizeWeak# :: Weak# a -> State# RealWorld -> (# State# RealWorld, Int#, State# RealWorld -> (# State# RealWorld, () #) #)
  mkWeak# :: a -> b -> c -> State# RealWorld -> (# State# RealWorld, Weak# b #)

  check# :: (State# RealWorld -> (# State# RealWorld, a #)) -> State# RealWorld -> State# RealWorld
  finalizeWeak# :: Weak# a -> State# RealWorld -> (# State# RealWorld, Int#, State# RealWorld -> (# State# RealWorld, b #) #)
  mkWeak# :: a -> b -> (State# RealWorld -> (# State# RealWorld, c #)) -> State# RealWorld -> (# State# RealWorld, Weak# b #)

Removed from GHC.Prim:

  parAt# :: b -> a -> Int# -> Int# -> Int# -> Int# -> c -> Int#
  parAtAbs# :: a -> Int# -> Int# -> Int# -> Int# -> Int# -> b -> Int#
  parAtForNow# :: b -> a -> Int# -> Int# -> Int# -> Int# -> c -> Int#
  parAtRel# :: a -> Int# -> Int# -> Int# -> Int# -> Int# -> b -> Int#
  parGlobal# :: a -> Int# -> Int# -> Int# -> Int# -> b -> Int#
  parLocal# :: a -> Int# -> Int# -> Int# -> Int# -> b -> Int#

Added to GHC.Prim:

  getSizeofMutableByteArray# :: MutableByteArray# d -> State# d -> (# State# d, Int# #)
  subWordC# :: Word# -> Word# -> (# Word#, Int# #)
  runRW# :: (State# RealWorld -> (# State# RealWorld, o #)) -> (# State# RealWorld, o #)

Added to GHC.Types:

  data Module = Module TrName TrName
  data Nat
  data Symbol
  data TrName = TrNameS Addr# | TrNameD [Char]
  data TyCon = TyCon Word# Word# Module TrName