Bug 251603

Summary: Non-arm64e/x86 platforms load otherwise ignored tag arguments to call/jmp
Product: WebKit Reporter: Angelos Oikonomopoulos <angelos>
Component: JavaScriptCoreAssignee: Angelos Oikonomopoulos <angelos>
Status: RESOLVED FIXED    
Severity: Normal CC: webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Angelos Oikonomopoulos 2023-02-02 09:46:56 PST 
The extra arguments to call/jmp for pointer tagging are only used on arm64e (and are ignored during code generation on other platforms). However, on risc platforms, generic passes that convert large immediates to "load immediate into reg + use reg" sequences will pointlessly generate instructions to load any extra arguments into regs. This is dead code.
Comment 1 Angelos Oikonomopoulos 2023-02-02 09:54:10 PST 
Pull request: https://github.com/WebKit/WebKit/pull/9532
Comment 2 Radar WebKit Bug Importer 2023-02-09 09:47:44 PST 
<rdar://problem/105227555>
Comment 3 EWS 2023-02-16 03:37:46 PST 
Committed 260359@main (0faaa00680c0): <https://commits.webkit.org/260359@main>

Reviewed commits have been landed. Closing PR #9532 and removing active labels.