On 3/28/14 6:42 PM, Neil wrote:
Boris Zbarsky wrote:
But "slow" here is a relative term. Last I measured, something like a
basic property get in Ion code went from 2-3 instructions to 20-30
instructions when we deoptimize.
...
What about calls from xpconnect (the original object was a component
exposed as a chrome javascript global property)?
Calls from JS into C++ via XPConnect (so XPCWrappedNative and company)
take about 1500-3000 instructions last I measured. Calls from C++ into
JS (via XPCWrappedJS) are in the 300-500 instruction range last I measured.
If you're going through XPConnect, then property access deoptimizations
due to [[Prototype]] sets are the least of your performance problems.
-Boris
_______________________________________________
dev-platform mailing list
dev-platform@lists.mozilla.org
https://lists.mozilla.org/listinfo/dev-platform
