Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 0ba6297de022a3c74ee5c06cec673bb4f3b9d970
https://github.com/WebKit/WebKit/commit/0ba6297de022a3c74ee5c06cec673bb4f3b9d970
Author: Yusuke Suzuki <[email protected]>
Date: 2026-06-16 (Tue, 16 Jun 2026)
Changed paths:
M Source/JavaScriptCore/b3/B3ReduceStrength.cpp
M Source/JavaScriptCore/runtime/OptionsList.h
Log Message:
-----------
[JSC] Avoid fix-point iteration in B3 ReduceStrength
https://bugs.webkit.org/show_bug.cgi?id=317181
rdar://179773016
Reviewed by Justin Michaud.
We are finding that B3 ReduceStrength is taking too long time for large
graph. And because of characteristics of fix-point analysis, the last
iteration is wasteful no-op. Based on preliminary analysis, actually 98%
of B3 values are converged in the first run and remaining runs are only
handling the remaining 2%.
Based on this characteristics, we reorganize B3 ReduceStrength phase to
run only up to twice. But when I did this, we observed several JetStream3
benchmark regressions, thus we look into each case and ensure that the
required conversion happens in the single path and making them neutral.
* Source/JavaScriptCore/b3/B3ReduceStrength.cpp:
* Source/JavaScriptCore/runtime/OptionsList.h:
Canonical link: https://commits.webkit.org/315315@main
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