| commit | 06caff224a290898cc013a35a02c756a992306f6 | [log] [tgz] |
|---|---|---|
| author | Darius M <dmercadier@chromium.org> | Mon Oct 09 09:38:25 2023 |
| committer | V8 LUCI CQ <v8-scoped@luci-project-accounts.iam.gserviceaccount.com> | Mon Oct 09 10:53:23 2023 |
| tree | 4e85e1884b3e0eaf58884e6f8365ecc2f6d99259 | |
| parent | 28bedca3d693e9cf27d86d361ca68ac12a4bd1d1 [diff] |
[compiler] Improve branch fusion when operations are skipped This change is motivated by the following graph: 471: Int32SubWithOverflow(464, 6) 472: Projection[0](471) 473: Projection[1](471) 474: DeoptimizeIf[Overflow, FeedbackSource(INVALID)](473, 470) 475: Int32LessThanOrEqual(43, 472) 476: Branch[Unspecified, None](475) -> B54, B61 During ISEL, 475 is fused with 476, which means that is thus never marked as Defined. As a result, when trying to cover fuse 471 in 474, we decide not to, because 472 has a use in the current block that is not yet Defined. With this change, we'll realize that the use of 472 will in fact never be Defined, so we can ignore it, and we can then indeed fuse 471 with 474. Bug: v8:12783 Change-Id: I76a70e99a3884963f2c8129aa59773240a01ebca Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4921729 Reviewed-by: Nico Hartmann <nicohartmann@chromium.org> Commit-Queue: Darius Mercadier <dmercadier@chromium.org> Cr-Commit-Position: refs/heads/main@{#90299}
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
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