0.21.11

Added

• The CUDA backend now supports compute capability 8.6 and 8.7.

• Philip Børgesen has implemented a new optimisation for GPU backends
  that migrates scalar work to the GPU, in order to reduce
  synchronisation. This results in major speedup for some programs.

• String literals are now allowed in input blocks.

• Experimental and undocumented support for automatic differentiation,
  available on the secret menu.

• Assertions and attributes are now ignored when used as size
  expressions. E.g. iota (assert p n) 0 now has size n.

• futhark test only runs the interpreter if passed -i.

• futhark literate now shows progress bars when run with -v.

Fixed

• futhark lsp is now better at handling multiple files (#1647).

• Incorrect handling of local quantification when determining type
  equivalence in during module type ascription (#1648).

• Incorrect checking of liftedness when instantiating polymorphic
  functions during module type ascription.

• Tightened some restrictions on the use of existential sizes that
  could otherwise lead to compiler crashes (#1650). This restriction
  is perhaps a bit too might and it may be possible to loosen it in
  the future.

• Another defunctorisation bug (#1653). Somehow we find these every
  time Martin Elsman writes a nontrivial Futhark program.

• futhark bench: convergence phase now does at least --runs runs.

• Errors and warnings no longer awkwardly mixed together in console output.

• Slightly better type errors for ambiguous sizes (#1661).

• Better type errors for module ascription involving nested modules
  (#1660).

• futhark doc: some formatting bugs.

• futhark doc didn't notice all local module types (#1666).

• Missing consumption check in optimisation could lead to ICE (#1669).