2 ms·

Would that be feasible on something like iOS that doesn't allow third-party JIT? Could this allow for translating WASM or emulator workloads to something that

• mncharity 4y ago
  Re iOS, yes. But runs fast? The words have to be small enough that the branch misprediction penalty (order-10 cycles) is significant. So for example, if a word is a single 3 cycle op then the dispatch matters, but with a dependency chain just a few ops long, the potential win drops under 50%. And having multiple copies of words will increase pressure on the instruction cache, so there will be a tradeoff, which may or may not be a win. So... perhaps this could be a way to dynamically optimize loop interiors? Or... perhaps to permit low-cost register shuffling words to glue together larger words with varied hard-wired register expectations? Or... insert creative idea here? There are blog posts around where someone writes a simple vm and incrementally optimizes it. But I don't recall seeing one yet with an iOS-ish focus of no-JIT, lots of registers, modern branch prediction... and so throws creative stuff against the wall and measures if anything sticks. It might be interesting to take such a blog post/series and do a followup?