0.22.6

Added

• Slightly better type errors for sum types (#1792).

• Better tracing output in interpreter (#1795).

• Improved optimisation of code that uses zero-element arrays
  (sometimes used for type witnesses).

Fixed

• Mishandling of bounds checks in parallel backends could cause
  compiler crashes (#1791).

• Mis-simplification of certain sequentialised scatters into
  single-element arrays (#1793).

• Invalid scatter fusion would cause an internal compiler error
  (#1794).

• The code generator flipped the order of match cases.

• Simpification of concatenations (#1796).

• Defunctionalisation error for fancy size programming (#1798).

• Code generation for load-unbalanced reductions in multicore backend
  (#1800).

• Futhark now works on CUDA 12 (#1801).

• mul_hi and mad_hi for signed integer types now actually do
  signed multiplication (previously it was always unsigned).

0.22.5

Added

• Memory short circuiting now also applied to the multicore backend.

• Fixes for AD of scan with nonscalar operators. Work by Lotte
  Bruun and Ulrik Larsen.

• Generalised histograms now supported in AD. Work by Lotte Bruun and
  Ulrik Larsen.

• OpenCL kernels now embed group size information, which can
  potentially be used for better register allocation by the OpenCL
  implementation.

Fixed

• A hole in the type checker that allowed one to sneak functions out
  if conditionals (#1787).

• futhark repl: unsigned integers are now printed correctly.

• A bug in the type-checking of match (#1783).

• Missing sequencing in type-checking of in-place let expressions (#1786).

• Crash in defunctionaliser caused by duplicate parameter names
  (#1780).

• Infelicities in multicore codegen for scans (#1777).

0.22.4

Added

• Memory short circuiting, a major new optimisation by Philip
  Munksgaard that avoids copies by constructing values in-place.

Fixed

• assert was sometimes optimised away by CSE.

• futhark literate now handles type abbreviations in entry points
  (#1750).

• Handling of non-inlined functions in GPU code. Still very restricted.

• Uniqueness checking bug (#1751).

• Simplification bug (#1753).

• A bug related to optimisation of scalar code migrated to GPU.

• Memory optimisation bug for top-level constants (#1755).

• Handling of holes in defunctionalisation (again).

• A few cases where optimisation (safely but perhaps confusingly)
  removed bounds checks (#1758).

• Futhark now works on Windows again (#1734). This support remains
  very flaky and not well tested.

• Type inference of field projection (#1762).

0.22.3

Fixed

• Non-server executables neglected to synchronise before printing results (#1731).

• Fixed handling of holes in defunctionalisation (#1738).

• Ascription of higher-order modules (#1741).

• Fixed compiler crash when attempting to tile irregular parallelism (#1739).

• Incorrect regularity checking in loop interchange (#1744).

• Pattern match exhaustiveness of bools (#1748).

• Improper consumption checking of nonlocal bindings (#1749).

0.22.2

Added

• futhark repl is now delightfully more colourful.

• futhark repl no longer prints scalar types with type suffixes (#1724).

• futhark pyopencl executables now accept --build-option.

• New functions: f16.nextafter, f32.nextafter, f64.nextafter,
  matching the ones in the C math library.

• futhark literate now prints directives in the output exactly as
  they appear in the source.

Fixed

• Diagnostics will no longer contain control codes when output is a
  file.

• CLI executables now fail when printing an opaque instead of
  producing garbage. This improves handling of some incorrect uses of
  auto output (#1251).

0.22.1

Removed

• Removed prelude functions reduce_stream, map_stream,
  reduce_stream_per, and reduce_map_per.

Fixed

• Various fixes to scalar migration (#1721).

0.21.15

Fixed

• Corrupted OOM error messages.

• Excessive internal fragmentation for some programs (#1715).

0.21.14

Fixed

• replicate was broken for sizes that didn't fit in i32.

• Transposition of empty arrays in interpreter (#1700).

• Exotic simplification error (#1309).

• Rare race condition could lead to leaking of error message memory in
  multicore and ispc backends (#1709).

• Overzealous aliasing for built-in overloaded types (#1711).

0.21.13

Added

• New fusion engine by Amar Topalovic and Walter Restelli-Nielsen.
  Fuses more, which is good for some programs and bad for others.
  Most programs see no change. This is mainly a robust foundation for
  further improvements.

• New experimental backend: ispc. By Louis Marott Normann,
  Kristoffer August Kortbæk, William Pema Norbu Holmes Malling, and
  Oliver Bak Kjersgaard Petersen.

• New prelude functions: hist, spread. These function as
  non-consuming variants of reduce_by_index and scatter.

• Using == to compare arrays is now deprecated.

• New command: futhark tokens. You probably don't care about this one.

• In the C API, opaque types that correspond to tuples or records can
  now have their elements inspected and be created from elements
  (#1568).

• New server protocol commands: types, fields, entry_points.

• Tuples and records can now be passed from FutharkScript to Futhark
  entry points (#1684).

Fixed

• Sometimes missing cases in match expressions were not detected.

• A defective simplification rule could in very rare cases lead to
  infinite recursion in the compiler (#1685).

• Some broken links in futhark doc output (#1686).

• Incorrect checking of whether a function parameter is consumable
  based on its type (#1687).

• Missing aliases for functions that return multiple aliased values
  (#1690).

• new/values functions for GPU backends are now properly
  asynchronous (#1664). This may uncover bugs in application code.

0.21.12

Added

• Somewhat simplified the handling of "uniqueness types" (which is a
  term we are moving away from). You should never see * in
  non-function types, and they are better thought of as effect
  indicators.

• futhark literate: prints tracing output (and other logging
  messages that may occur) when run with -v (#1678).

• Entry points can now be any valid Futhark identifier.

Fixed

• futhark test -C was broken.

• futhark_context_free() for the GPU backends neglected to free some
  memory used for internal bookkeeping, which could lead to memory
  leaks for processes that repeatedly create and destroy contexts
  (#1676).

• FutharkScript now allows ' in names.

• futhark lsp now handles warnings in programs that also have errors.