[Webkit-unassigned] [Bug 119509] New: implement DFG separate thread on 32 bit ARM_THUMB2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119509

           Summary: implement DFG separate  thread on 32 bit ARM_THUMB2
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: xinchao.peng at samsung.com


DFG Separate Thread  need to enable concurrent_jit . In platform.h ,
/* Concurrent JIT only works on 64-bit platforms because it requires that
   values get stored to atomically. This is trivially true on 64-bit platforms,
   but not true at all on 32-bit platforms where values are composed of two
   separate sub-values. */
#if PLATFORM(MAC) && ENABLE(DFG_JIT) && USE(JSVALUE64)
#define ENABLE_CONCURRENT_JIT 1
#endif
In fact ,ByteSpinLock need implement CAS .But on ARM_THUMB2 , function"weakCompareAndSwap" have implemented .
Why not enable CONCURRENT_JIT on ARM_THUMB2?

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