0.3.0

Added

• A comprehensible error message is now issued when attempting to
  run a Futhark program on an OpenCL that does not support the
  types used by the program. A common case was trying to use
  double-precision floats on an Intel GPU.

• Parallelism inside of a branch can now be exploited if the branch
  condition and the size of its results is invariant to all
  enclosing parallel loops.

• A new OpenCL memory manager can in some cases dramatically
  improve performance for repeated invocations of the same entry
  point.

• Experimental support for incremental flattening. Set the
  environment variable FUTHARK_VERSIONED_CODE to any value to try
  it out.

• futhark-dataset: Add -t/-type option. Useful for
  inspecting data files.

• Better error message when ranges written with two dots
  (x..y).

• Type errors involving abstract types from modules now use
  qualified names (less "expected 't', got 't'", more "expected
  'foo.t', got 'bar.t'").

• Shorter compile times for most programs.

• futhark-bench: Add --skip-compilation flag.

• scatter expressions nested in maps are now parallelised.

• futlib: an fft module has been added, thanks to David
  P.H. Jørgensen and Kasper Abildtrup Hansen.

Removed

• futhark-dataset: Removed --binary-no-header and
  --binary-only-header options.

• The split language construct has been removed. There is a
  library function split that does approximately the same.

Changed

• futlib: the complex module now produces a non-abstract complex
  type.

• futlib: the random module has been overhauled, with several new
  engines and adaptors changed, and some of the module types
  changed. In particular, rng_distribution now contains a numeric
  module instead of an abstract type.

• futlib: The vec2 and vec3 modules now represent vectors as
  records rather than tuples.

• futlib: The linalg module now has distinct convenience functions
  for multiplying matrices with row and column vectors.

• Only entry points defined directly in the file given to the
  compiler will be visible.

• Range literals are now written without brackets: x...y.

• The syntax (-x) can no longer be used for a partial application
  of subtraction.

• futhark-test and futhark-bench will no longer append .bin to
  executables.

• futhark-test and futhark-bench now replaces actual/expected
  files from previous runs, rather than increasing the litter.

Fixed

• Fusion would sometimes remove safety checks on e.g. reshape
  (#436).

• Variables used as implicit fields in a record construction are now
  properly recognised as being used.

• futlib: the num_bits field for the integer modules in math now
  have correct values.