[Webkit-unassigned] [Bug 224618] New: [JSC] Remove RareCaseProfile

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224618

            Bug ID: 224618
           Summary: [JSC] Remove RareCaseProfile
           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: ysuzuki at apple.com

RareCareProfile is only used for add, to_this, sub and mod, while we are allocating it for all bytecodes having slowcases in JIT.
And since each RareCaseProfile has 8 bytes, this is too large for this rare case counter.

We should do some of these things.

1. We should consider putting very small counter (uint8_t or less) in Metadata for these opcodes.
2. And/Or we should put this counter in IC's data structure.

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