Modestas Valauskas
ace4bb1ad6
Adds a benchmark exercising int.oneBitCount and int.trailingZeroBitCount (landed in CL 498041) and a representative set of Int32x4 SIMD bitwise kernels, through a small bit-array implementation built on a Uint32List word store. Kernels: - cardinality: popcount across the array. - forEachSetBit: Brian-Kernighan iteration via ctz. - select(k): position of the k-th set bit using popcount + ctz. - complementCardinality: popcount of bitwise-NOT per word. - totalBitLength: sum of int.bitLength per word. - intersection / union / xor / difference: pair-op bitwise kernels using Int32x4 SIMD with a scalar tail. - complement: single-input bitwise NOT via Int32x4 XOR-with-all-ones. Each kernel has a Swar baseline using portable bit-twiddle code and an Accelerated variant that uses the new int getters or Int32x4 SIMD, so the speedup attributable to the hardware/intrinsic path is visible directly. main() first runs a correctness check that asserts both implementations agree across a representative range of sizes and bit densities, then reports timings via the standard BenchmarkBase harness. Work towards https://github.com/dart-lang/sdk/issues/1053 (efficient BitSet implementation). Bug: https://github.com/dart-lang/sdk/issues/52673 Change-Id: I5ae5bc0b9d07f6de3e11907ac1fae80f02e77119 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/503020 Commit-Queue: Slava Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Auto-Submit: Modestas Valauskas <valauskasmodestas@gmail.com> Reviewed-by: Slava Egorov <vegorov@google.com>
Dart
An approachable, portable, and productive language for high-quality apps on any platform
Dart is:
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Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
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Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
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Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
License & patents
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Using Dart
Visit dart.dev to learn more about the language, tools, and to find codelabs.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).
Building Dart
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents in our repo at docs.
Contributing to Dart
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.
Roadmap
Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.