nightly

Commits

• deac456: futhark script: add -b option. (Troels Henriksen)

0.25.20

Added

• Better error message when in-place updates fail at runtime due to a
  shape mismatch.

Fixed

• #[unroll] on an outer loop now no longer causes unrolling of all
  loops nested inside the loop body.

• Obscure issue related to replications of constants in complex
  intrablock kernels.

• Interpreter no longer crashes on attributes in patterns.

• Fixes to array indexing through C API when using GPU backends.

0.25.19

Added

• The compiler now does slightly less aggressive inlining. Use the
  #[inline] attribute if you want to force inlining of some
  function.

• Arrays of opaque types now support indexing through the C API.
  Arrays of records can also be constructed. (#2082)

Fixed

• The opencl backend now always passes
  -cl-fp32-correctly-rounded-divide-sqrt to the kernel compiler, in
  order to match CUDA and HIP behaviour.

0.25.18

Added

• New prelude function: rep, an implicit form of replicate.

• Improved handling of large monomorphic single-dimensional array
  literals (#2160).

Fixed

• futhark repl no longer asks for confirmation on EOF.

• Obscure oversight related to abstract size-lifted types (#2120).

• Accidential exponential-time algorithm in layout optimisation for
  multicore backends (#2151).

0.25.17

• Faster device-to-device copies on CUDA.

• "More correctly" detect L2 cache size for OpenCL backend on AMD GPUs.

Fixed

• Handling of .. in import paths (again).

• Detection of impossible loop parameter sizes (#2144).

• Rare case where GPU histograms would use slightly too much shared
  memory and fail at run-time.

• Rare crash in layout optimisation.

0.25.16

Added

• futhark test: --no-terminal now prints status messages even when
  no failures occur.

• futhark test no longer runs structure tests by default. Pass
  -s to run them.

• Rewritten array layout optimisation pass by Bjarke Pedersen and
  Oscar Nelin. Minor speedup for some programs, but is more
  importantly a principled foundation for further improvements.

• Better error message when exceeding shared memory limits.

• Better dead code removal for the GPU representation (minor impact on
  some programs).

Fixed

• Bugs related to deduplication of array payloads in sum types.
  Unfortunately, fixed by just not deduplicating in those cases.

• Frontend bug related to turning size expressions into variables
  (#2136).

• Another exotic monomorphisation bug.

0.25.15

Added

• Incremental Flattening generates fewer redundant code versions.

• Better simplification of slices. (#2125)

Fixed

• Ignore type suffixes when unifying expressions (#2124).

• In the C API, opaque types that correspond to an array of an opaque
  type are now once again named futhark_opaque_arr_....

• cuda backend did not correctly profile CPU-to-GPU scalar copies.

0.25.14

Added

• The prelude definition of filter is now more memory efficient,
  particularly when the output is much smaller than the input. (#2109)

• New configuration for GPU backends:
  futhark_context_config_set_unified_memory, also available on
  executables as --unified-memory.

• The "raw" API functions now do something potentially useful, but are
  still considered experimental.

• futhark --version now reports GHC version.

Fixed

• Incorrect type checking of let-bound sizes occurring multiple times
  in pattern. (#2103).

• A concatenation simplification would sometimes mess up sizes.
  (#2104)

• Bug related to monomorphisation of polymorphic local functions
  (#2106).

• Rare crash in short circuiting.

• Referencing an unbound type parameter could crash the type checker
  (#2113, #2114).

• Futhark now works with GHC 9.8 (#2105).

0.25.13

Added

• Incremental flattening of map-scan compositions with nested
  parallelism (similar to the logic for map-reduce compositions
  that we have had for years).

• futhark script, for running FutharkScript expressions from the
  command line.

• futhark repl now prints out a message when it ignores a breakpoint
  during initialisation. (#2098)

Fixed

• Flattening of scatter with multi-dimensional elements (#2089).

• Some instances of not-actually-irregular allocations were mistakenly
  interpreted as irregular. Fixing this was a dividend of the memory
  representation simplifications of 0.25.12.

• Obscure issue related to expansion of shared memory allocations (#2092).

• A crash in alias checking under some rare circumstances (#2096).

• Mishandling of existential sizes for top level constants. (#2099)

• Compiler crash when generating code for copying nothing at all. (#2100)

0.25.12

Added

• f16.copysign, f32.copysign, f64.copysign.

• Trailing commas are now allowed for all syntactical elements that
  involve comma-separation. (#2068)

• The C API now allows destruction and construction of sum types (with
  some caveats). (#2074)

• An overall reduction in memory copies, through simplifying the
  internal representation.

Fixed

• C API would define distinct entry point types for Futhark types that
  differed only in naming of sizes (#2080).

• == and != on sum types with array payloads. Constructing them is
  now a bit slower, though. (#2081)

• Somewhat obscure simplification error caused by neglecting to update
  metadata when removing dead scatter outputs.

• Compiler crash due to the type checker forgetting to respect the
  explicitly ascribed non-consuming diet of loop parameters (#2067).

• Size inference did incomplete level/scope checking, which could
  result in circular sizes, which usually manifested as the type
  checker going into an infinite loop (#2073).

• The OpenCL backend now more gracefully handles lack of platform.