Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 4e25b3d33639634597b7fb073b67c4aabaa8f51e
https://github.com/WebKit/WebKit/commit/4e25b3d33639634597b7fb073b67c4aabaa8f51e
Author: Yijia Huang <yijia_hu...@apple.com>
Date: 2025-04-08 (Tue, 08 Apr 2025)
Changed paths:
M Source/JavaScriptCore/dfg/DFGLoopUnrollingPhase.cpp
Log Message:
-----------
[JSC] Support partial loop unrolling with non-constant initial induction
values
https://bugs.webkit.org/show_bug.cgi?id=291297
rdar://148865126
Reviewed by Yusuke Suzuki.
Previously, loop unrolling required the induction variable's initial value to
be a constant (CheckedInt32) in order to proceed with full or partial unrolling.
This change generalizes the handling of the initialValue field to support both
constant and non-constant forms by making it a std::variant<Node*,
CheckedInt32>.
As a result, partial unrolling can now proceed even when the induction variable
is initialized with a non-constant value, improving the optimizer's ability to
handle a broader range of loop forms. Also updated debug output to reflect the
variant type of initialValue.
* Source/JavaScriptCore/dfg/DFGLoopUnrollingPhase.cpp:
(JSC::DFG::LoopUnrollingPhase::LoopData::shouldFullyUnroll const):
(JSC::DFG::LoopUnrollingPhase::identifyInductionVariable):
(JSC::DFG::LoopUnrollingPhase::LoopData::dump const):
Canonical link: https://commits.webkit.org/293452@main
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