Status: Accepted
Owner: [email protected]
CC: [email protected]
Labels: Type-Bug Priority-Medium

New issue 3212 by [email protected]: Type feedback is lost on recompile with deoptimization support
http://code.google.com/p/v8/issues/detail?id=3212

Type feedback vectors are reinitialized on full-code recompile, even though it seems unnecessary for the case when we are recompiling just to add deoptimization support. It seems that we would destroy type feedback precisely at the moment when we want it most!

This problem has been in the tree a long time. A first attempt to solve it was in February 2014, when the type vector was saved in the SharedFunctionInfo. But it became too complex. Another pass will be taken at the problem which will be much simpler because we'll first remove DeferredFeedbackSlotProcessing, in favor of determining slots fully at parse time.

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