f966d451b5
"arm" and "aarch64" support different sets of `target_feature` and `simd_test` arguments, and for "arm", the set of features that can be dynamically detected is different again. Restructure the generator code to allow this to be expressed accurately (in future patches). This implementation preserves the way that target features are specified for shared intrinsics, because this has an impact on the generated documentation. In particular, rustdoc cannot look inside `cfg_attr(target_arch = ...)` tests, so we use unconditional `target_feature` attributes where possible.
core::arch - Rust's core library architecture-specific intrinsics
The core::arch module implements architecture-dependent intrinsics (e.g. SIMD).
Usage
core::arch is available as part of libcore and it is re-exported by
libstd. Prefer using it via core::arch or std::arch than via this crate.
Unstable features are often available in nightly Rust via the
feature(stdsimd).
Using core::arch via this crate requires nightly Rust, and it can (and does)
break often. The only cases in which you should consider using it via this crate
are:
-
if you need to re-compile
core::archyourself, e.g., with particular target-features enabled that are not enabled forlibcore/libstd. Note: if you need to re-compile it for a non-standard target, please prefer usingxargoand re-compilinglibcore/libstdas appropriate instead of using this crate. -
using some features that might not be available even behind unstable Rust features. We try to keep these to a minimum. If you need to use some of these features, please open an issue so that we can expose them in nightly Rust and you can use them from there.
Documentation
- Documentation - i686
- Documentation - x86_64
- Documentation - arm
- Documentation - aarch64
- Documentation - powerpc
- Documentation - powerpc64
- How to get started
- How to help implement intrinsics
License
core_arch is primarily distributed under the terms of both the MIT license and
the Apache License (Version 2.0), with portions covered by various BSD-like
licenses.
See LICENSE-APACHE, and LICENSE-MIT for details.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in core_arch by you, as defined in the Apache-2.0 license,
shall be dual licensed as above, without any additional terms or conditions.