Updates:
Status: Accepted
Comment #30 on issue 3006 by [email protected]: Inaccurate sin/cos
values
http://code.google.com/p/v8/issues/detail?id=3006
[Re-opening this issue, there seems to be something to do... ]
While I don't have any concrete numbers at hand, I'm quite sure that for
what we're talking about in this issue, you can consider a call from V8
into C land as "expensive". The number of instructions are a bad metric
BTW, because you have tons of secondary effects, like negative impact on
V8's register allocation (due to different calling conventions), memory
traffic caused by frame (de-)construction, etc. Furthermore, the
latency/throughput numbers for instructions on modern CPUs vary by more
than 2 orders of magnitude (for different instructions on the same CPU) and
are highly dependent on pipelining/caching/prediction issues, so I don't
think we can give anything more concrete than "expensive". For something
more concrete you would have to measure, and repeat this on several
platforms.
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