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by myndzi
4689 days ago
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> People should not need to care about IR or (worse) disassembly. If your code is reasonable it should just work reasonably fast. File bugs if it does not, instead of tuning, which can break as soon as V8 moves left or right. The trouble with this is that the results are not in your own hands. Developers have bosses and deadlines and all that, and when it comes down to it, they just need to make it work. In that position, it's awfully hard to "submit a bug report and pray," and though it's not optimal, the ability to get into the guts of things can satisfy the immediate need. |
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You don't need to be praying. If no immediate fix can be made in the V8, you will get some recommendations and explanations based on the V8 team knowledge.
I would go as far as saying that bug reports like this are a single most reliable signal of what JS developers want to be fast on the web. By not reporting performance issues and silently working around them you hinder this signal. THere might be bugs and inconsistencies in underlying VM optimizations that can go unnoticed for a long time due to that.