commit | 5c320a108aae22a35456038fb271464ea0a499d4 | [log] [tgz] |
---|---|---|
author | Vyacheslav Egorov <vegorov@google.com> | Tue Sep 12 22:39:25 2023 +0000 |
committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Tue Sep 12 22:39:25 2023 +0000 |
tree | 417e011b218890aeb24a3947f5f11cc41990d222 | |
parent | 16cc32f0ecaafb31663636c807b43487a8e36548 [diff] |
[vm/compiler] Improve flow sensitivity of CP Before running CP find all branches of form `Branch(v eq C)`, where `eq` is one of `===`, `==`, `!==` or `!=` and `C` is a constant and insert a redefinition of `v` in the true successor which captures the information that `v` is equal to `C` guaranteed by the branch. SCCP algorithm can then use this information when propagating constants. After SCCP all redefinitions inserted are removed again. We don't actually replace `v` with `C` in the dominated code because this might lead to issues later, for example it might result in redundant phis `phi(C, v)` (`C` flowing from a predecessor where `v == C`) which are complicated to eliminate again. TEST=vm/dart/comparison_canonicalization_il_test Cq-Include-Trybots: luci.dart.try:vm-aot-linux-release-x64-try,vm-aot-linux-debug-simarm_x64-try,vm-aot-linux-debug-x64-try,vm-aot-android-release-arm64c-try Change-Id: I388dddb97b5e35f09d9904000c585864f27400f6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/324980 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>
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