[webkit-dev] Using OfflineAsm
cvienneau at ea.com
Fri Sep 5 15:23:47 PDT 2014
I'm looking for some information about the Java script interpreter ASM backend, aka OfflineAsm.
First a bit of background information; the code I have been using is about a year old, on several platforms we don't run with JIT and won't be able to enable it. This means that we've been using the LLINT_C_LOOP path in these cases. It was considered that the ASM backend may be able to improve performance in this case, currently I'm taking a look at how things are done in a more recent snapshot of the trunk to be sure this development effort will be going in the right direction on what is done there. As a side note I see that LLINT_C_LOOP has been replaced with #if !ENABLE(JIT) which I guess is pretty much how it has always behaved.
So my questions are:
1) How is the ASM backend intended to be used? Is there a doc that covers this?
3) If JIT is expected to use the ASM backend is there a way this can be worked around?
4) Should I actually expect a performance increase compared to the "C LOOP"?
5) Are there any other suggestions on how to improve performance of Java script code in a non-JIT port?
Thanks for any feedback
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