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Roger Peppe authored
Detect when scan is being called recursively and re-use the same scan state. On my machine, for a recursion-heavy benchmark, this results in 44x speed up. This does impose a 4% penalty on the non-recursive case, which can be removed by heap-allocating the saved state, at 40% performance penalty on the recursive case. Either way is fine with me. R=r CC=golang-dev https://golang.org/cl/4253049
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