Alexander Aprelev
5b0285866d
This reverts commit415b040d6f. Reason for revert: breaks riscv https://github.com/dart-lang/sdk/issues/63479 Original change's description: > Reland "[vm] Recognize int.trailingZeroBitCount/oneBitCount as graph-inlinable" > > The previous attempt was reverted because it broke unoptimized JIT > on ARM 32. This reland force-optimizes the two getters. > > Stacks on top of the int.{trailingZeroBitCount,oneBitCount} API CL > (commit754239b077). Both getters route through OTHER_RECOGNIZED_LIST > when a hardware fast path is available; otherwise the newly added > Dart bodies inline at call sites via vm:prefer-inline. The C++ > natives are removed. > > Backend codegen > --------------- > ARM64: NEON CNT + UADDLV (popcount); RBIT + CLZ (ctz). > ARM: NEON CNT + VPADDL chain (popcount); RBIT + CLZ on the > register pair (ctz). > x64: popcntq when TargetCPUFeatures::popcnt_supported(); > LoadImmediate(64) + rep_bsfq for ctz (decodes as tzcnt > on BMI1+, preserves dest on zero otherwise). > RISC-V 64: cpop / ctz when RV_baseline includes Zbb. > > Per-arch availability is encapsulated in > UnaryInt64OpInstr::IsSupported(Token::Kind). > > Apple M-series ARM64, AOT (us/iter, lower is better): > cardinality.swar 371 > cardinality.accelerated 154 (2.4x) > forEachSetBit.swar 19031 > forEachSetBit.accelerated 4988 (3.8x) > select.swar 199 > select.accelerated 77 (2.6x) > complementCardinality.swar 399 > complementCardinality.accel 152 (2.6x) > > Work towards https://github.com/dart-lang/sdk/issues/6486 (popcount > and ctz intrinsification). > > Work towards https://github.com/dart-lang/sdk/issues/1053 (efficient > BitSet implementation). > > Fixes https://github.com/dart-lang/sdk/issues/52673 > Fixes https://github.com/dart-lang/sdk/issues/38346 > Fixes https://github.com/dart-lang/sdk/issues/63436 > Issue https://github.com/dart-lang/sdk/issues/10212 > Issue https://github.com/dart-lang/sdk/issues/5798 > TEST=tests/corelib/int_bit_count_test > > Cq-Include-Trybots: luci.dart.try:vm-linux-release-simarm-try,vm-ffi-qemu-linux-release-arm-try,vm-aot-linux-release-simarm_x64-try,vm-aot-linux-debug-simarm_x64-try,dart-sdk-linux-riscv64-try > Change-Id: Ib812cbaec6e371b9720df7a543411f78e524cac1 > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/506060 > Reviewed-by: Martin Kustermann <kustermann@google.com> > Auto-Submit: Modestas Valauskas <valauskasmodestas@gmail.com> > Reviewed-by: Slava Egorov <vegorov@google.com> > Commit-Queue: Martin Kustermann <kustermann@google.com> Cq-Include-Trybots: luci.dart.try:vm-linux-release-simarm-try,vm-ffi-qemu-linux-release-arm-try,vm-aot-linux-release-simarm_x64-try,vm-aot-linux-debug-simarm_x64-try,dart-sdk-linux-riscv64-try No-Presubmit: true No-Tree-Checks: true No-Try: true Change-Id: Iaf11d03d394fa615098bed8fcdea38ba40c7e45f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/507520 Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com> Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Kevin Moore <kevmoo@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.