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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.8.0 - 2024-12-07

Changed

  • Upgraded to syn 2. This shouldn't break compatibility with the 0.7 releases, but there might be minor differences.

Fixed

  • Read retpoline target features from command line flags because they're LLVM features, not Rust features.

0.7.4 - 2024-03-15

Fixed

  • Fix is_{arch}_feature_detected path for non-x86.

0.7.3 - 2023-08-10

Fixed

  • Don't include unstable target features in targets = "simd".

0.7.2 - 2023-05-10

Fixed

0.7.1 - 2022-12-23

Fixed

  • Fixed handling patterns in match_target.

0.7.0 - 2022-12-09

Changed

  • The multiversion macro has been overhauled. Now uses a single attribute macro, rather than helper attributes.
  • Increased minimum required Rust version to 1.61.0.

Added

  • The function dispatch method is now selectable, between direct or indirect dispatch, as well as compile-time static dispatch.
  • Added a variety of macros in the multiversion::target module for querying the selected target features.
  • Targets can now be specified by CPU (e.g. x86-64-v2 or skylake).
  • Added option to pass attributes to clones.
  • Added special targets = "simd" option to automatically target all SIMD instruction sets.

Removed

  • Removed the specialize mode. All targets now specify clones. Specialization should be implemented by querying the selected targets.
  • Removed support for functions that reference self or Self. Previous support was inconsistent and difficult to use correctly.

Fixed

  • Fixed broken impl Trait support. Using impl Trait in return position now results in an error.
  • Dispatch is now bypassed in scenarios where no targets are specified for the target architecture, or if the first matching target features are known to exist at compile time.
  • Improved performance of direct dispatch.
  • Avoid indirect dispatch in some situations, such as when using retpolines

0.6.1 - 2020-08-18

Fixed

  • Fixed disallowing some valid architectures, such as "wasm32"

0.6.0 - 2020-07-13

Added

  • Added are_cpu_features_detected macro.
  • Added #[crate_path] helper attribute for renaming/reimporting the crate.

Changed

  • Changed runtime_dispatch Cargo feature to std
  • Changed static dispatching from the #[static_dispatch] helper attribute to dispatch! helper macro.

0.5.1 - 2020-05-29

Changed

  • Removed dependency on regex and once_cell

Fixed

  • Fixed bug where #[multiversion] failed to compile when crate was re-exported or renamed.

0.5.0 - 2020-04-19

Added

  • Support for associated functions (including methods).
  • Support for impl Trait.
  • Specification for name mangling.
  • Documentation for #[safe_inner] helper attribute for #[target].

Removed

  • Removed #[target_clones] attribute (functionality is now included in #[multiversion] attribute).

Changed

  • #[multiversion] interface now uses helper attributes, providing both target specialization and function cloning.
  • Increased minimum required Rust version to 1.34.0.

Fixed

  • Vague error spans now point to a more informative source location.
  • All errors now produce compile_error! instead of macro panics.

0.4.0 - 2020-03-20

Added

  • Cargo feature runtime_dispatch (enabled by default) which adds runtime CPU feature detection.
  • #[no_std] support when the runtime_dispatch feature is disabled.

Fixed

  • Fixed disallowing features with dots, such as sse4.2.

0.3.0 - 2019-12-30

Added

  • Conditional compilation with #[target_cfg] helper macro
  • Support for const generics

Changed

  • multiversion macro now requires unsafe to dispatch unsafe functions from safe functions

Fixed

  • Fixed incorrect argument forwarding for destructured function arguments
  • Static dispatch across modules now uses proper visibility
  • Specifying architectures without features no longer results in compilation errors

0.2.0 - 2019-11-10

Changed

  • Improved ergonomics of multiversion macro. It has been changed from a function-like macro to a macro attribute.

Added

  • target macro attribute
  • Static dispatching with #[static_dispatch] helper macro
  • Support for async, lifetimes, and generic functions
  • This changelog

0.1.1 - 2019-09-10

Fixed

  • Removed an extra dependency

0.1.0 - 2019-09-10

Added

  • Initial multiversion implementation