[Webkit-unassigned] [Bug 69174] New: DFG JIT, Branch on integer can always be a 32-bit compare.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69174

           Summary: DFG JIT, Branch on integer can always be a 32-bit
                    compare.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


if (shouldSpeculateInteger(node.child1()) && !isStrictInt32(node.child1())), the JSVALUE64 JIT will currently compare all 64bits in the register, but in these cases the DataFormat is always a JS boxed integer.  In these cases we can just compare the low 32bits anyway - no need to check the tag.  This allows the code to be unified with the JSVALUE32_64 JIT.

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