Merging upstream version 1.75.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 144 insertions, 0 deletions

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+# `Simd<[T; N]>`
+
+## Implementation of [Rust RFC #2366: `std::simd`][rfc2366]
+
+[![Latest Version]][crates.io] [![docs]][master_docs]
+
+**WARNING**: this crate only supports the most recent nightly Rust toolchain
+and will be superseded by [`#![feature(portable_simd)]`](https://github.com/rust-lang/portable-simd).
+
+## Documentation
+
+* [API docs (`master` branch)][master_docs]
+* [Performance guide][perf_guide]
+* [API docs (`docs.rs`)][docs.rs]
+* [RFC2366 `std::simd`][rfc2366]: - contains motivation, design rationale,
+  discussion, etc.
+
+## Examples
+
+Most of the examples come with both a scalar and a vectorized implementation.
+
+* [`aobench`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/aobench)
+* [`fannkuch_redux`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/fannkuch_redux)
+* [`matrix inverse`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/matrix_inverse)
+* [`mandelbrot`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/mandelbrot)
+* [`n-body`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/nbody)
+* [`options_pricing`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/options_pricing)
+* [`spectral_norm`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/spectral_norm)
+* [`triangle transform`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/triangle_xform)
+* [`stencil`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/stencil)
+* [`vector dot product`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/dot_product)
+
+## Cargo features
+
+* `into_bits` (default: disabled): enables `FromBits`/`IntoBits` trait
+  implementations for the vector types. These allow reinterpreting the bits of a
+  vector type as those of another vector type safely by just using the
+  `.into_bits()` method.
+
+## Performance
+
+The following [ISPC] examples are also part of `packed_simd`'s
+[`examples/`](https://github.com/rust-lang-nursery/packed_simd/tree/master/examples/)
+directory, where `packed_simd`+[`rayon`][rayon] are used to emulate [ISPC]'s
+Single-Program-Multiple-Data (SPMD) programming model. The performance results
+on different hardware is shown in the `readme.md` of each example. The following
+table summarizes the performance ranges, where `+` means speed-up and `-`
+slowdown:
+
+* `aobench`: `[-1.02x, +1.53x]`,
+* `stencil`: `[+1.06x, +1.72x]`,
+* `mandelbrot`: `[-1.74x, +1.2x]`,
+* `options_pricing`:
+   * `black_scholes`: `+1.0x`
+   * `binomial_put`: `+1.4x`
+
+ While SPMD is not the intended use case for `packed_simd`, it is possible to
+ combine the library with [`rayon`][rayon] to poorly emulate [ISPC]'s SPMD programming
+ model in Rust. Writing performant code is not as straightforward as with
+ [ISPC], but with some care (e.g. see the [Performance Guide][perf_guide]) one
+ can easily match and often out-perform [ISPC]'s "default performance".
+
+## Platform support
+
+The following table describes the supported platforms: `build` shows whether
+the library compiles without issues for a given target, while `run` shows
+whether the test suite passes for a given target.
+
+| **Linux**                             | **build** | **run** |
+|---------------------------------------|-----------|---------|
+| `i586-unknown-linux-gnu`              | ✓         | ✗       |
+| `i686-unknown-linux-gnu`              | ✓         | ✗       |
+| `x86_64-unknown-linux-gnu`            | ✓         | ✓       |
+| `arm-unknown-linux-gnueabihf`         | ✓         | ✓       |
+| `armv7-unknown-linux-gnueabi`         | ✓         | ✓       |
+| `aarch64-unknown-linux-gnu`           | ✓         | ✓       |
+| `powerpc-unknown-linux-gnu`           | ✓         | ✗       |
+| `powerpc64-unknown-linux-gnu`         | ✓         | ✗       |
+| `powerpc64le-unknown-linux-gnu`       | ✓         | ✓       |
+| `s390x-unknown-linux-gnu`             | ✓         | ✗       |
+| `sparc64-unknown-linux-gnu`           | ✓         | ✗       |
+| `thumbv7neon-unknown-linux-gnueabihf` | ✓         | ✓       |
+| **MacOSX**                            | **build** | **run** |
+| `x86_64-apple-darwin`                 | ✓         | ✓       |
+| **Android**                           | **build** | **run** |
+| `x86_64-linux-android`                | ✓         | ✓       |
+| `armv7-linux-androideabi`             | ✓         | ✗       |
+| `aarch64-linux-android`               | ✓         | ✗       |
+| `thumbv7neon-linux-androideabi`       | ✓         | ✗       |
+| **iOS**                               | **build** | **run** |
+| `x86_64-apple-ios`                    | ✗         | ✗       |
+| `aarch64-apple-ios`                   | ✗         | ✗       |
+
+
+## Machine code verification
+
+The
+[`verify/`](https://github.com/rust-lang-nursery/packed_simd/tree/master/verify)
+crate tests disassembles the portable packed vector APIs at run-time and
+compares the generated machine code against the desired one to make sure that
+this crate remains efficient.
+
+## License
+
+This project is licensed under either of
+
+* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+  ([LICENSE-APACHE](LICENSE-APACHE))
+
+* [MIT License](http://opensource.org/licenses/MIT)
+  ([LICENSE-MIT](LICENSE-MIT))
+
+at your option.
+
+## Contributing
+
+We welcome all people who want to contribute.
+Please see the [contributing instructions] for more information.
+
+Contributions in any form (issues, pull requests, etc.) to this project
+must adhere to Rust's [Code of Conduct].
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in `packed_simd` by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+
+[travis]: https://travis-ci.com/rust-lang/packed_simd
+[Travis-CI Status]: https://travis-ci.com/rust-lang/packed_simd.svg?branch=master
+[appveyor]: https://ci.appveyor.com/project/gnzlbg/packed-simd
+[Appveyor Status]: https://ci.appveyor.com/api/projects/status/hd7v9dvr442hgdix?svg=true
+[Latest Version]: https://img.shields.io/crates/v/packed_simd.svg
+[crates.io]: https://crates.io/crates/packed_simd
+[docs]: https://docs.rs/packed_simd/badge.svg
+[docs.rs]: https://docs.rs/packed_simd
+[master_docs]: https://rust-lang-nursery.github.io/packed_simd/packed_simd/
+[perf_guide]: https://rust-lang-nursery.github.io/packed_simd/perf-guide/
+[rfc2366]: https://github.com/rust-lang/rfcs/pull/2366
+[ISPC]: https://ispc.github.io/
+[rayon]: https://crates.io/crates/rayon
+[boost_license]: https://www.boost.org/LICENSE_1_0.txt
+[SLEEF]: https://sleef.org/
+[sleef_sys]: https://crates.io/crates/sleef-sys
+[contributing instructions]: contributing.md
+[Code of Conduct]: https://www.rust-lang.org/en-US/conduct.html