Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 3ec66a7fd7e54ddc27c98b3c51995f5ec9a8749a
https://github.com/WebKit/WebKit/commit/3ec66a7fd7e54ddc27c98b3c51995f5ec9a8749a
Author: Yusuke Suzuki <[email protected]>
Date: 2025-11-19 (Wed, 19 Nov 2025)
Changed paths:
A JSTests/stress/arith-modulo-power-of-two-int32.js
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp
Log Message:
-----------
[JSC] A bit more optimizations for `n % power-of-two` in FTL
https://bugs.webkit.org/show_bug.cgi?id=302763
rdar://165021624
Reviewed by Keith Miller.
We should do a bit more optimizations for `n % power-of-two`.
1. Int32 / Int32-power-of-two (larger than 1) never generates
non-Int32 value except for negative 0 `-1 % 1`
2. Use DFG's ArithMod optimization to FTL.
Test: JSTests/stress/arith-modulo-power-of-two-int32.js
* JSTests/stress/arith-modulo-power-of-two-int32.js: Added.
(testMod2):
(testMod4):
(testMod8):
(testMod16):
(testMod32):
(testMod64):
(testMod128):
(testMod256):
(testMod512):
(testMod1024):
(testMod2048):
(testMod4096):
(testMod65536):
(testMod1048576):
(chainedMod):
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileArithMod):
Canonical link: https://commits.webkit.org/303241@main
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