This crate implements a half-precision floating point f16
type for Rust implementing the IEEE
754-2008 standard binary16
a.k.a half
format, as well as a bf16
type implementing the
bfloat16
format.
The f16
and bf16
types provides conversion operations as a normal Rust floating point type, but
since they are primarily leveraged for minimal floating point storage and most major hardware does
not implement them, all math operations are done as an f32
type under the hood. Complex arithmetic
should manually convert to and from f32
for better performance.
This crate provides no_std
support by
default so can easily be used in embedded code where a smaller float format is most useful.
Requires Rust 1.51 or greater. If you need support for older versions of Rust, use versions 1.7.1 and earlier of this crate.
See the crate documentation for more details.
-
serde
- ImplementSerialize
andDeserialize
traits forf16
andbf16
. This adds a dependency on theserde
crate. -
use-intrinsics
- Use hardware intrinsics forf16
andbf16
conversions if available on the compiler host target. By default, without this feature, conversions are done only in software, which will be the fallback if the host target does not have hardware support. Available only on Rust nightly channel. -
alloc
- Enable use of thealloc
crate when not using thestd
library.This enables the
vec
module, which contains zero-copy conversions for theVec
type. This allows fast conversion between rawVec<u16>
bits andVec<f16>
orVec<bf16>
arrays, and vice versa. -
std
- Enable features that depend on the Ruststd
library, including everything in thealloc
feature.Enabling the
std
feature enables runtime CPU feature detection when theuse-intrsincis
feature is also enabled. Without this feature detection, intrinsics are only used when compiler host target supports them. -
num-traits
- EnableToPrimitive
,FromPrimitive
,Num
,Float
,FloatCore
andBounded
trait implementations from thenum-traits
crate. -
bytemuck
- EnableZeroable
andPod
trait implementations from thebytemuck
crate. -
zerocopy
- EnableAsBytes
andFromBytes
trait implementations from thezerocopy
crate.
This library is distributed under the terms of either of:
- MIT License (http://opensource.org/licenses/MIT)
- Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
at your option.
This project is REUSE-compliant. Copyrights are retained by their contributors. Some files may include explicit copyright notices and/or license SPDX identifiers. For full authorship information, see the version control history.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.