half

Fixed

• loongarch64 lsx hardware intrinsics for f16 conversions now enabled only under nightly cargo feature, fixing compile errors on stable Rust.

Changed

• zerocopy is now a required dependency. The optional zerocopy crate feature is deprecated. This change is to ensure better code safety and prevent potential unsound behavior.
• Git repository URL has changed due to GitHub user name change. Old URL is redirected.

Added

• New num-traits implementations: Signed for f16 and bf16. By @djsell.
• loongarch64 lsx hardware intrinsic support for f16 conversions. By @heiher.
• Implemented Weight trait from rand crate for f16 and bf16 with rand optional cargo feature. By @majian4work.

Fixed

• min and max incorrectly propagate NaN values when self is NaN. Fixes #126, by @mgottscho.
• Suppressed warnings from new unnecessary_transmutes lint.

Removed

• doc_auto_cfg feature has been removed from docs.rs documentation due to removal of rust feature.

Changed

• Fixed some incorrect minimum supported versions of dependencies that weren't caught due to
  improper Cargo.lock:
  • num-traits 0.2.14 -> 0.2.16
  • zerocopy 0.8.0 -> 0.8.23
  • arbitrary 1.3.2 -> 1.4.1

Added

• f16 and bf16 now implement Immutable and KnownLayout for zerocopy crate. By [@usamoi].

Changed

• Updated optional dependencies to latest major versions:
  • zercopy 0.6 -> 0.8
  • rand 0.8 -> 0.9
  • rand_distr 0.4 -> 0.5
  • rkyv 0.7 -> 0.8
  • (dev) criterion 0.4 -> 0.5
• Minimum supported Rust version has been changed to 1.81 due to above dependency updates.
• Minor restructuring of included license file locations to be more consistent with crates ecosystem.

Added

• Added support for arbitrary crate. Fixes #110. By @FL33TW00D.
• New num-traits implementations: FromBytes and ToBytes for f16 and bf16. By @kpreid.

Fixed

• Suppressed unexpected_cfg lint warnings on newer versions of stable Rust.
• Resolved ambiguous rustdoc warnings due to new unstable f16 primitive in compiler.

Fixed

• Missing macro import causing build failure on no_std + alloc feature set. Fixes #107.
• Clippy warning on nightly rust.

Added

• Optional rkyv support. Fixes #100, by @comath.
• New num-traits implementations: AsPrimitive<f16> for bf16 and AsPrimitive<bf16> for
  f16, allowing lossy conversions between the two types. By @charles-r-earp.
• Cargo.lock added to vcs as is now recommended for library crates.

Fixed

• Remove some unit NaN conversion sign tests due to non-deterministic hardware. Fixes #103.
• Redundant import warnings on nightly Rust.

Fixed

• Compile error on x86 (not x86_64) targets. Fixes #93.

Added

• Support for Kani Rust Verifier. By @cameron1024.
• Support for rand_distr::Distribution implementations behind rand_distr optional cargo feature. By @coreylowman.
• Floating point formatting options in Display and Debug implementations. By @eiz.

Changed

• Breaking Change Minimum supported Rust version is now 1.70.
• Breaking Change Minimum supported Rust version policy reverted to original policy of allowing minimum supported Rust version updates for minor releases instead of only major to avoid segmentation and allow optimizing hardware implementations without unnecessary major releases.
• Hardware intrinsics/assembly is finally available on stable Rust, including using hardware feature detection (std only), including:
  • AArch64 now uses FP16 hardware instructions for conversions and math operations when available.
  • x86/x86-64 now uses F16C hardware instructions for conversions (but no math operations) when available. Fixes #54.

Deprecated

• use-intrinsics cargo feature no longer used. Hardware support will now always be used whenever possible. A future version may output deprecation warnings if this feature is enabled.

Fixed

• Improve code generation of leading_zeros functions by inlining. By @encounter.
• Sum implementation of bf16 incorrectly performed product instead of sum. By @wx-csy.
• Compile failed when serde cargo feature enabled but std not enabled.
• Incorrect black boxing of benchmark tests.
• Rustdoc cfg display on docs.rs not getting enabled.

Changed

• Reduced unnecessary bounds checks for SIMD operations on slices. By @Shnatsel.
• Further slice conversion optimizations for slices. Resolves #66.

Fixed

• Potential soundness issues resolved.