Comment #8 on issue 2741 by [email protected]: max_opt_count is
implemented using the wrong kind of limit
http://code.google.com/p/v8/issues/detail?id=2741
I still don't understand what you're talking about; and there seem to be a
lot of things you don't understand about V8.
- "how its full codegen passes hot code to the optimizer" -- the full
codegen doesn't pass anything.
- "mark it as a loop" -- mark *what* as a loop? On which condition?
- "how much CFG information you use" -- there is no CFG before
optimization, as building the CFG is part of optimizing a function.
- "decrease that max-opt-count variable to 0 or 1" -- what problem would
that solve?
- "on a per-loop node header basis" -- wat?
- "disabling those specific nodes from being passed to the optimizer" --
optimization happens on a per-function bases, not per-AST-node.
- "only ever called once per iteration" -- of course, unless you have
nested loops, everything in the loop is called once per iteration.
- "neither being invariant and hoistable" -- so what?
- "parsing different data each iteration" -- again, so what? That's
perfectly normal. All useful, non-trivial loops perform different
computations in each iteration. What does that have to do with optimizing
them?
- "parts could be optimized" -- nope, either the entire function is
optimized or nothing.
- "some sort of loop length/depth optimizations" -- what optimizations
would that be?
- "this is a key optimization" -- *what* is a key optimization?
Please, before suggesting how to change V8's compiler pipeline, get a
proper understanding of how it currently works, and then clearly state your
ideas for changes. Otherwise any discussion is a waste of time, which is
why I'll withdraw from this discussion now.
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