Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 259a8560a7d22a95247c2dadf3c921db7592eb6b
https://github.com/WebKit/WebKit/commit/259a8560a7d22a95247c2dadf3c921db7592eb6b
Author: Dan Hecht <[email protected]>
Date: 2025-03-21 (Fri, 21 Mar 2025)
Changed paths:
A JSTests/stress/fasttmps-cause-out-of-registers.js
M Source/JavaScriptCore/b3/air/AirAllocateRegistersByGreedy.cpp
M Source/JavaScriptCore/b3/air/AirRegisterAllocatorStats.h
Log Message:
-----------
[JSC][GreedyRegAlloc] fastTmps should spill as a last resort
https://bugs.webkit.org/show_bug.cgi?id=290039
rdar://147419532
Reviewed by Yijia Huang.
Rather than marking fastTmps as unspillable, make them
spillable but with a very high spill cost so that they will
be spilled only as a last resort. Otherwise, the register
allocator can run out of registers.
* JSTests/stress/fasttmps-cause-out-of-registers.js: Added.
(test):
(opt):
* Source/JavaScriptCore/b3/air/AirAllocateRegistersByGreedy.cpp:
(JSC::B3::Air::Greedy::TmpData::dump const):
(JSC::B3::Air::Greedy::TmpData::spillCost):
(JSC::B3::Air::Greedy::GreedyAllocator::initSpillCosts):
(JSC::B3::Air::Greedy::GreedyAllocator::addSpillTmpWithInterval):
(JSC::B3::Air::Greedy::GreedyAllocator::tryEvict):
* Source/JavaScriptCore/b3/air/AirRegisterAllocatorStats.h:
Canonical link: https://commits.webkit.org/292484@main
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