0.15.1

Added

• Futhark now type-checks size annotations using a size-dependent
  type system.

• The parallel code generators can now handle bounds checking and
  other safety checks.

• Integer division by zero is now properly safety-checked and
  produces an error message.

• Integer exponentiation with negative exponent is now properly
  safety-checked and produces an error message.

• Serious effort has been put into improving type errors.

• reduce_by_index may be somewhat faster for complex operators on
  histograms that barely fit in local memory.

• Improved handling of in-place updates of multidimensional arrays
  nested in map. These are now properly parallelised.

• Added concat_to and flatten_to functions to prelude.

• Added indices function to the prelude.

• futhark check and all compilers now take a -w option for
  disabling warnings.

• futhark bench now accepts --pass-compiler-option.

• The integer modules now have mad_hi and mul_hi functions for
  getting the upper part of multiplications. Thanks to @porcuquine for the contribution!

• The f32 and f64 modules now also define sinh, cosh,
  tanh, asinh, acosh, and atanh functions.

• The f32 and f64 modules now also define fma and mad
  functions.

Removed

• Removed update, split2, intersperse, intercalate, pick,
  steps, and range from the prelude.

Changed

• "futlib" is now called "prelude", and it is now an error to
  import it explicitly.

Fixed

• Corrected address calculations in csharp backend.

• The C backends are now more careful about generating overflowing
  integer operations (since this is undefined behaviour in C, but
  defined in Futhark).

• futhark dataset no longer crashes uncontrollably when used
  incorrectly (#849).