Futhark

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).

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.