265272 2023-11-22 18:44:59 -0800 Integer calculation error after JIT optimization. 2025-05-23 17:27:20 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All Linux RESOLVED DUPLICATE 257949 InRadar P2 Normal --- 1 anbu1024 d_degazio bfulgham darin d_degazio webkit-bug-importer ysuzuki oldest_to_newest 1994475 0 anbu1024 2023-11-22 18:44:59 -0800 JSC version: 5a5dc5a5c26808fa98392aecc83d38935b72d255 Build options: ``` ./Tools/Scripts/build-jsc --jsc-only --debug ``` test case: ``` function opt(){ var x = -19278.05 >>> String; var y = x + -19278.05; var z = y >> String; return z; } let a = opt(); print("result before JIT opt") print(a); for(let i=0; i<0x200; i++){ opt(); } let b = opt(); print("result after JIT opt") print(b); ``` Result: ``` result before JIT opt -38557 result after JIT opt -38556 ``` 1994476 1 webkit-bug-importer 2023-11-22 18:45:09 -0800 <rdar://problem/118731614> 1999420 2 d_degazio 2023-12-13 14:56:07 -0800 Pull request: https://github.com/WebKit/WebKit/pull/21767 2119459 3 ysuzuki 2025-05-23 17:27:15 -0700 We fixed this via bug 257949 2119460 4 ysuzuki 2025-05-23 17:27:20 -0700 *** This bug has been marked as a duplicate of bug 257949 ***