[Webkit-unassigned] [Bug 70418] DFG JIT 32_64 - improve double boxing/unboxing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70418





--- Comment #6 from Yuqiang Xian <yuqiang.xian at intel.com>  2011-10-19 16:05:10 PST ---
(In reply to comment #4)
> This patch is a great improvement. Long term, it seems like it would be even better to teach the DFG JIT not to load into GPRs in the first place when dealing with doubles.

Thanks. Yes, we're also seeking the opportunity to eliminate some of the double boxing/unboxings. We kept some code to let a JSValue able to be represented by a single FPR if we know it's actually a Double at compile time, while it's currently unused as it introduces a bit complex logic in code generation. But we'll revisit this for sure.

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