[Webkit-unassigned] [Bug 151415] New: Remove some unnecessary jumps in snippet code.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151415

            Bug ID: 151415
           Summary: Remove some unnecessary jumps in snippet code.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

Previously, the snippet generators always emit a jump at the end of the fast path.  In the baseline JIT and FTL, this results in a jump to the very next instruction.  I've change it to assume that the fast path will just fall thru, and let the client decide instead if it wants/needs a jump or not after the fast path.

I also changed the generators to provide a didEmitFastPath() query explicitly declare if they actually generated the fast path, instead of having the client infer it from an empty endJumpList.

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