[Webkit-unassigned] [Bug 191420] New: [JSC] Introduce op_load_const bytecode

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Nov 8 07:41:44 PST 2018


            Bug ID: 191420
           Summary: [JSC] Introduce op_load_const bytecode
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yusukesuzuki at slowstart.org

op_mov is one of the most executed bytecode. While it is so much executed, its implementation is a bit bloated.
The main reason is that src register can take the normal register or constant register.
Speedometer Ember.js score shows regression with the new bytecode format. It indicates that LLInt performance is critical even if JIT is fully enabled.
I think introducing op_load_const tightens op_mov.

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