| commit | d84b374683db0c72f5db0f71af4f1f4130364256 | [log] [tgz] |
|---|---|---|
| author | Alexander Markov <alexmarkov@google.com> | Fri Sep 27 13:28:59 2024 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Fri Sep 27 13:28:59 2024 +0000 |
| tree | 298d50b23638d2e4f3361ce7c9144037d6aa165f | |
| parent | 986626a532ef25703033a5559454ccd93adf66c6 [diff] |
[vm] Improve bounds check elimination in range analysis
* Infer range for CheckArrayBound and GenericCheckBound instructions.
* Extend Constraint instruction to non-Smi values bounded by list
length.
* Unwrap UnboxInt64 during canonicalization of range boundaries.
* Use symbolic range for UnboxInt64 of list length.
As a result, bounds check can be eliminated in a loop over a growable
list:
```
for (int i = 0; i < a.length; ++i) {
final value = a[i];
...
}
```
TEST=runtime/tests/vm/dart/regress_56726_il_test.dart
Fixes https://github.com/dart-lang/sdk/issues/56726
Change-Id: Ic56df18f6fbf26abf91d6ecbff24d68678dccb60
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/386522
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
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