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| <sanjoyd> | mraleph: out of curiosity, did you guys ever consider making crankshaft a tracing JIT? |
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| 11:35:33
| <mraleph> | sanjoyd: no. |
| 11:35:58
| <mraleph> | sanjoyd: tracing works fine only for simple loopy code. |
| 11:36:37
| <mraleph> | sanjoyd: as soon as you get a real OOP program that is polymorphic and branchy all over the place tracing does not work as well as it is advertized. |
| 11:37:00
| <mraleph> | sanjoyd: good example will be DeltaBlue that is like 5 times faster on V8 then on LJ2. |
| 11:37:53
| <mraleph> | sanjoyd: why do you ask? |
| 11:38:40
| <sanjoyd> | mraleph: just curious, have been looking into LJ2 lately. |
| 11:39:46
| <mraleph> | it's true that tracing has its benefits over method jit on a loopy code |
| 11:41:09
| <sanjoyd> | Yeah, it seemed to me that you won't be able to do things like representation changes and other OOP things nicely in a tracing JIT. |
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| <sanjoyd> | Like a value might be 31 bit integral in a specific trace, but all the trace exits will have to box it back, which may not have been necessary. |
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| <mraleph> | sanjoyd: I guess if you have a hot side exit you will trace from it and then you can eliminate a boxing on the border between traces when you connect them. Though it is not clear how easy it is and whether LJ2 does that. |
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| <mraleph> | should be pretty easy. |
| 11:48:49
| <sanjoyd> | mraleph: yeah, LJ2 does something like that in eliminating unneeded lua-stack operations. But we still have to wait for the side trace to get hot even when we have the info required to propagate the integer representation further. |
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| <sanjoyd> | I guess the central point is that a tracing JIT only sees a single trace, while a method JIT has the whole CFG to infer from. |
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| <mraleph> | sanjoyd: well, yes. but it does not waste time propagating information from places that do not matter and neither does information from the cold places obscure the inference. |
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| <mraleph> | sanjoyd: in method jit you would have to assign weights to loops somehow to drive inference right way in complex cases. |
| 12:08:56
| <mraleph> | in tracing JIT it happens naturally. |
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| <Ke> | is there somewhere a guide on how to sandbox v8 that is not chromium source code |
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