| commit | c0c9c98787ae91781eb0d014f19331baf79277d9 | [log] [tgz] |
|---|---|---|
| author | Jens Johansen <jensj@google.com> | Thu May 04 06:25:28 2023 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Thu May 04 06:25:28 2023 +0000 |
| tree | 9e57a04170e16314ab8ef997560ac1f8675e2ca8 | |
| parent | 8ea8160cd8653be410f815bb15c05ca304695499 [diff] |
[flow analysis] Don't create a new empty map for every FlowModel
Currently every FlowModel creates a new empty map that's just supposed
to be empty. When compiling `compile.dart` (from the CFE) this creates
more than 200,000 maps for seemingly no reason.
This CL removes it, thus saving the creation of (...instrumenting the
platform...) 229,472 maps when compiling `compile.dart` (from the CFE).
Thinking it was done to avoid some polymorphism I have gone over the
created flowgraphs for the file in both JIT and AOT and found only
improvements.
AOT compiled `compile.dart` then compiling itself improves by ~3.5%:
```
Difference at 95.0% confidence
-0.1365 +/- 0.0576111
-3.55191% +/- 1.49912%
(Student's t, pooled s = 0.090011)
```
Change-Id: Ifdbb57e9aa3c23b2af512a2104aaf6caf72831ef
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/301061
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
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