| commit | 4eaacc3df96fb5d4d2a847f450d57a0691962f95 | [log] [tgz] |
|---|---|---|
| author | Martin Kustermann <kustermann@google.com> | Fri Feb 04 22:06:59 2022 +0000 |
| committer | Commit Bot <commit-bot@chromium.org> | Fri Feb 04 22:06:59 2022 +0000 |
| tree | 59b3ddf030bc7e6a6f0a55247c9370c8360c753b | |
| parent | 0962b173d6d8d8ed151aabcb6ba6e9d719d3d2b5 [diff] |
[vm] Improve async performance by taking advantage of static types of returned values In general any async function can return X or Future<X>. Though the future implementation has to do different things depending on which case we're in. It does so by using a `<obj> is Future<T>` test. This test is very expensive if many different classes flow into `<obj>`. Though most functions do not return `Future` objects from async functions. We can determine that statically by looking if any returned expression could be a future. If not, we can bypass the `is Future<T>` test entirely. Issue https://github.com/dart-lang/sdk/issues/48226 Issue https://github.com/dart-lang/sdk/issues/48235 TEST=pkg/front_end/testcases/general/async_function_returns_future_or.dart Change-Id: If655bdbdddc214dd7b12be9905b3c788252547d0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/230662 Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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