Scripts can have associated counters measure JIT activity, stub call count, and type information at a per-PC granularity, and which can be updated by JM-compiled code. These counters are a handy way to get fine grained performance info, see what optimizations are being applied and quickly identify perf faults. This info can be accessed in the browser, https://addons.mozilla.org/addon/jit-inspector/. It would be good if IM also updated these counters and used this infrastructure, a bit trickier to do than JM due to SSA transformations, but if counters metadata can be attached to MIR nodes and accessed during codegen then this shouldn't be too hard.
Assignee: general → nicolas.b.pierron
Status: NEW → ASSIGNED
Assignee: nicolas.b.pierron → nobody
Status: ASSIGNED → NEW
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