[vm/compiler] Ignore redefinitions in CSE. Redefinitions exist to prevent code motion and don't affect the meaning of instructions they flow into as inputs. Consequently, when comparing two instructions for equality we should unwrap all the inputs. The only exception from the rule is LoadField instruction: we would like to avoid replacing a load from a redefinition with a dominating load from the original definition because that would break a dependency chain on the redefinition. This change is done to address code size regressions caused by retaining and/or inserting more redefinitions to prevent illegal code motions. These new redefinitions impact CSE optimizations and (without this CL) lead to redundant boxing being left over in the optimized code. TEST=ci Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-release-x64-try Change-Id: Idd917fcb8c7117670a1d9c5c32f1bae57569d3b5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/219242 Commit-Queue: Slava Egorov <vegorov@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
Dart is:
Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.
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:
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.
Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
Dart is free and open source.
See LICENSE and PATENT_GRANT.
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).
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.
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.