Change Log

Notable changes to the project will be documented in this file.

The format is based on Keep a Changelog and the project adheres to the Haskell Package Versioning Policy (PVP)

1.3.0.0 - 2020-08-26

Added

• Instances of Elt are now derivable via Generic for simple (Haskell'98) product and sum data types.
• Pattern synonyms for manipulating custom product and sum types can now be created; see Pattern, mkPattern
• Added pattern synonyms for accessing tuples and indices, as an alternative to lift and unlift.
• Support for pattern matching in the embedded language; see match

Changed

• The stencil functions now support fusion. Note however that the source (delayed) array will be evaluated at every access to the stencil pattern; if the delayed function is expensive, you may wish to explicitly compute the source array first, matching the old behaviour.

• Removed Slice constraint from some indexing operations

• Improve fusion for zipWith* (#453)

• The indexing function to permute now returns a Maybe type (#87)

• (internal) Visible type applications are used instead of Proxy types

• (internal) EltR is now a class-associated type of Elt

• (internal) GArrayData has been simplified

• (internal) SIMD representation has been improved and generalised

• (internal) Internal refactoring (#449, #455, #457, #460)

• Probably many others I have forgotten about

Removed

• Drop support for GHC-7.10 .. 8.4.

Contributors

Special thanks to those who contributed patches as part of this release:

• Trevor L. McDonell (@tmcdonell)
• Joshua Meredith (@JoshMeredith)
• Ivo Gabe de Wolff (@ivogabe)
• David van Balen (@dpvanbalen)
• Jaro Reinders (@noughtmare)
• Alex Lang (@alang9)
• Paul Wilson (@status_failed)
• @lennonhill
• Travis Whitaker (@TravisWhitaker)
• Roger Bosman (@rogerbosman)
• Robbert van der Helm (@robbert-vdh)
• Sam (@sam-340453)
• Lars van den Haak (@sakehl)
• Rinat Striungis (@Haskell-mouse)
• Viktor Kronvall (@considerate)
• Tom Smeding (@tomsmeding)
• Ryan Scott (@RyanGlScott)

1.2.0.1 - 2018-10-06

Fixed

• Build fix for ghc-8.6

1.2.0.0 - 2018-04-03

Changed

• Internal debugging/RTS options handling has been changed. Compiling this package now implies that backends are also compiled in debug mode (no need to set the -fdebug cabal flag for those packages as well).
• Complex numbers are stored in the C-style array-of-struct representation.
• Improve numeric handling of complex numbers.
• Coercions (bitcast) now occur between the underlying representation types
• Front-end performance improvements

Added

• Support for half-precision floating-point numbers.
• Support for struct-of-array-of-struct representations. Currently this is limited to fields of 2,3,4,8, or 16-elements wide.
• Add equivalents for Data.Functor, Data.Semigroup (ghc-8+)
• Add instances and helper functions for Maybe and Either types
• Add rank generalised versions of take, drop, head, tail, init, slit, reverse and transpose.
• Implement counters and reporting for -ddump-gc-stats

Contributors

Special thanks to those who contributed patches as part of this release:

• Trevor L. McDonell (@tmcdonell)
• Ryan Scott (@ryanglscott)
• Rinat Striungis (@Haskell-mouse)

1.1.1.0 - 2017-09-26

Changed

• Improve and colourise the pretty-printer

1.1.0.0 - 2017-09-21

Added

• Additional EKG monitoring hooks (#340)

• Operations from RealFloat

Changed

• Changed type of scanl', scanr' to return an Acc tuple, rather than a tuple of Acc arrays.
• Specialised folds sum, product, minimum, maximum, and, or, any, all now reduce along the innermost dimension only, rather than reducing all elements. You can recover the old behaviour by first flatten-ing the input array.
• Add new stencil boundary condition function, to apply the given function to out-of-bounds indices.

Fixed

• #390: Wrong number of arguments in printf

1.0.0.0 - 2017-03-31

• Many API and internal changes
• Bug fixes and other enhancements

0.15.1.0

• Fix type of allocateArray

0.15.0.0

• Bug fixes and performance improvements.

0.14.0.0

• New iteration constructs.
• Additional Prelude-like functions.
• Improved code generation and fusion optimisation.
• Concurrent kernel execution in the CUDA backend.
• Bug fixes.

0.13.0.0

• New array fusion optimisation.
• New foreign function interface for array and scalar expressions.
• Additional Prelude-like functions.
• New example programs.
• Bug fixes and performance improvements.

0.12.0.0

• Full sharing recovery in scalar expressions and array computations.
• Two new example applications in package accelerate-examples (both including a graphical frontend):
  • A real-time Canny edge detection
  • An interactive fluid flow simulator
• Bug fixes.

0.11.0.0

• New Prelude-like functions zip*, unzip*, fill, enumFrom*, tail, init, drop, take, slit, gather*, scatter*, and shapeSize.
• New simplified AST (in package accelerate-backend-kit) for backend writers who want to avoid the complexities of the type-safe AST.

0.10.0.0

• Complete sharing recovery for scalar expressions (but currently disabled by default).
• Also bug fixes in array sharing recovery and a few new convenience functions.

0.9.0.0

• Streaming computations
• Precompilation
• Repa-style array indices
• Additional collective operations supported by the CUDA backend: stencils, more scans, rank-polymorphic fold, generate.
• Conversions to other array formats
• Bug fixes

0.8.1.0

• Bug fixes and some performance tweaks.

0.8.0.0

• More collective operations supported by the CUDA backend: replicate, slice and foldSeg. Frontend and interpreter support for stencil.
• Bug fixes.

0.7.1.0

• Initial release of the CUDA backend