| commit | b99b43a657ee96435de9c0e1dce53065235d9cba | [log] [tgz] |
|---|---|---|
| author | Lasse R.H. Nielsen <lrn@google.com> | Tue Jan 07 06:43:29 2025 -0800 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Tue Jan 07 06:43:29 2025 -0800 |
| tree | 5b7ed2269fbdbe97ea9da70d646a0a1846deb4a8 | |
| parent | a6d675a855683e426f32575d63432fb8cec6c4d5 [diff] |
Tweak some X64 assembler instructions to save bytes. Changes `xorpd(r,r)` and `xorq(r, r)` to `xorps(r,r)` and `xorl(r, r)`, which saves one (REX prefix) byte and still clears the register. (At least if the register is in the first 8, otherwise a REX byte is needed just to name the register. Still better to let the compiler worry about that than hardwiring a 64-bit `q` or `pd` operation.) Changes `andq` to `AndImmediate` which recognizes that a 32-bit or smaller immediate only needs an `andl` (again potentially saving a REX prefix). Simplifies the code for clamping an Uint8Clamped value to have fewer branches. (If we know the value is not in the 0..255 range, two instructions can convert all negative values to zero, and all positive values to a value with the lower 8 bit set: `(~v)>>63`.) Simplifies the code for "is infinite" to use one less 64-bit immediate (by multiplying by 2 to shift out the sign, rather than masking it out using a 63-bit mask.) Tested: No new behavior, only optimization. Covered by existing tests. Change-Id: I94e66c2ff39f0a207649f657e4da1ed43e4e819e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/385741 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
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:
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.
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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.
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