Hi, Jocelyn, have you tried to enable DFG JIT and/or LLINT on Windows? Both of them can speedup JSC. But I have no idea how MSVC friendly the LLINT asm is ...
On my Linux box I got the following numbers a week before for SunSpider: - interpreter (LLINT C-loop): 836 ms - LLINT (asm): 480 ms - JIT: 305 ms - LLINT + JIT: 193 ms - LLINT + JIT + DFG-JIT: 140 ms Ossy Jocelyn Turcotte írta:
Hi Stan, Chrome uses V8, while other ports of WebKit, including Qt, use JavaScriptCore (Qt only uses V8 for QML). JavaScriptCore has similar performance to V8 on Mac after Apple implemented what they call DFG JIT. On Windows 32bit it still has basic JIT. On Windows 64bit it lags way behind, where it's still using the interpreter. This patch brings basic JIT support for Windows x64 and should be released with Qt 5.1: https://bugs.webkit.org/show_bug.cgi?id=107965 This should be 2x-4x times faster than the interpreter according to my quick tests. But this still doesn't add support for DFG JIT, still only available on Mac and Linux, which would bring JS performances closer to Chrome's. So yes sadly I think that this kind of performance is currently expected on Windows x64 with Qt 5.0. Cheers, Jocelyn
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