75d4047276
The bad codegen reported in #48383 was due to an unused phi confusing the expression-tree construction algorithm. It was trying to generate data = cond ? callWithSideEffects() : null; but `data` is unused, so somehow we generated only cond; We should not have unused phis at this point so I put a safety check in the above code to not try to build an unused conditional, and changed the dead-code eliminator to eliminate dead phis. Now we get if (cond) callWithSideEffects(); I compared the output for some large apps and there were about a dozen changes. All looked like improvements, e.g. not assigning to an unused variable. There was some code missing that is now present, but luckily for the large apps, it was all code that did not have real-world side effects. Fixed: 48383 Change-Id: Id7b32cfa0cbfb47a4d9eff174ad9ae52da99f6a4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/232781 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Stephen Adams <sra@google.com> |
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Dart
A client-optimized language for fast apps on any platform
Dart is:
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Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.
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Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.
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 on our wiki.
Contributing to Dart
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.