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Changelog

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

Unreleased

1.7.1 - 2021-01-17

Fixed

Docs.rs now generates docs for bytemuck and num-traits optional features.

1.7.0 - 2021-01-17

Added

Added optional implementations of bytemuck traits Zeroable and Pod under bytemuck cargo feature. By @charles-r-earp.
Added optional implementations of num-traits traits ToPrimitive and FromPrimitive under num-traits cargo feature. By @charles-r-earp.
Added implementations of Binary, Octal, LowerHex, and UpperHex string format traits to format raw f16/bf16 bytes to string.

Changed

Debug trait implementation now formats f16/bf16 as float instead of raw bytes hex. Use newly implemented formatting traits to format in hex instead of Debug. Fixes #37.

1.6.0 - 2020-05-09

Added

Added LOG2_10 and LOG10_2 constants to both f16 and bf16, which were added to f32 and f64 in the standard library in 1.43.0. By @tspiteri.
Added to_le/be/ne_bytes and from_le/be/ne_bytes to both f16 and bf16, which were added to the standard library in 1.40.0. By @bzm3r.

1.5.0 - 2020-03-03

Added

Added the alloc feature to support the alloc crate in no_std environments. By @zserik. The vec module is now available with either alloc or std feature.

1.4.1 - 2020-02-10

Fixed

Added #[repr(transparent)] to f16/bf16 to remove undefined behavior. By @jfrimmel.

1.4.0 - 2019-10-13

Added

Added a bf16 type implementing the alternative bfloat16 16-bit floating point format. By @tspiteri.
f16::from_bits, f16::to_bits, f16::is_nan, f16::is_infinite, f16::is_finite, f16::is_sign_positive, and f16::is_sign_negative are now const fns.
slice::HalfBitsSliceExt and slice::HalfBitsSliceExt extension traits have been added for performing efficient reinterpret casts and conversions of slices to and from [f16] and [bf16]. These traits will use hardware SIMD conversion instructions when available and the use-intrinsics cargo feature is enabled.
vec::HalfBitsVecExt and vec::HalfFloatVecExt extension traits have been added for performing efficient reinterpret casts to and from Vec<f16> and Vec<bf16>. These traits are only available with the std cargo feature.
prelude has been added, for easy importing of most common functionality. Currently the prelude imports f16, bf16, and the new slice and vec extension traits.
New associated constants on f16 type to replace deprecated consts module.

Fixed

Software conversion (when not using use-intrinsics feature) now matches hardware rounding by rounding to nearest, ties to even. Fixes #24, by @tspiteri.
NaN value conversions now behave like f32 to f64 conversions, retaining sign. Fixes #23, by @tspiteri.

Changed

Minimum rustc version bumped to 1.32.
Runtime target host feature detection is now used if both std and use-intrinsics features are enabled and the compile target host does not support required features.
When use-intrinsics feature is enabled, will now always compile and run without error correctly regardless of compile target options.

Deprecated

consts module and all its constants have been deprecated; use the associated constants on f16 instead.
slice::from_bits has been deprecated; use slice::HalfBitsSliceExt::reinterpret_cast instead.
slice::from_bits_mut has been deprecated; use slice::HalfBitsSliceExt::reinterpret_cast_mut instead.
slice::to_bits has been deprecated; use slice::HalfFloatSliceExt::reinterpret_cast instead.
slice::to_bits_mut has been deprecated; use slice::HalfFloatSliceExt::reinterpret_cast_mut instead.
vec::from_bits has been deprecated; use vec::HalfBitsVecExt::reinterpret_into instead.
vec::to_bits has been deprecated; use vec::HalfFloatVecExt::reinterpret_into instead.

1.3.1 - 2019-10-04

Fixed

Corrected values of constants EPSILON, MAX_10_EXP, MAX_EXP, MIN_10_EXP, and MIN_EXP in consts module, as well as setting consts::NAN to match value of f32::NAN converted to f16. By @tspiteri.

1.3.0 - 2018-10-02

Added

slice::from_bits_mut and slice::to_bits_mut for conversion between mutable u16 and f16 slices. Fixes #16, by @johannesvollmer.

1.2.0 - 2018-09-03

Added

slice and optional vec (only included with std feature) modules for conversions between u16 and f16 buffers. Fixes #14, by @johannesvollmer.
to_bits added to replace as_bits. Fixes #12, by @tspiteri.

Fixed

serde optional dependency no longer uses its default std feature.

Deprecated

as_bits has been deprecated; use to_bits instead.
serialize cargo feature is deprecated; use serde instead.

1.1.2 - 2018-07-12

Fixed

Fixed compilation error in 1.1.1 on rustc < 1.27, now compiles again on rustc >= 1.10. Fixes #11.

1.1.1 - 2018-06-24 - Yanked

Yanked

Not recommended due to introducing compilation error on rustc versions prior to 1.27.

Fixed

Fix subnormal float conversions when use-intrinsics is not enabled. By @Moongoodboy-K.

1.1.0 - 2018-03-17

Added

Made to_f32 and to_f64 public. Fixes #7, by @PSeitz.

1.0.2 - 2018-01-12

Changed

Update behavior of is_sign_positive and is_sign_negative to match the IEEE754 conforming behavior of the standard library since Rust 1.20.0. Fixes #3, by @tspiteri.
Small optimization on is_nan and is_infinite from @tspiteri.

Fixed

Fix comparisons of +0 to -0 and comparisons involving negative numbers. Fixes #2, by @tspiteri.
Fix loss of sign when converting f16 and f32 to f16, and case where f64 NaN could be converted to f16 infinity instead of NaN. Fixes #5, by @tspiteri.

1.0.1 - 2017-08-30

Added

More README documentation.
Badges and categories in crate metadata.

Changed

serde dependency updated to 1.0 stable.
Writing changelog manually.

1.0.0 - 2017-02-03

Added

Update to serde 0.9 and stable Rust 1.15 for serialize feature.

0.1.1 - 2017-01-08

Added

Add serde support under new serialize feature.

Changed

Use no_std for crate by default.

0.1.0 - 2016-03-17

Added

Initial release of f16 type.