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Potential performance bug on SCOPED handlers #13

Description

@teofr

After testing some use cases with different handlers op kind, I realized that LH_OP_SCOPED seems slower than LH_OP_GENERAL. I tried changing the handler kind on https://github.com/koka-lang/libhandler/blob/master/test/test-state.c#L57-L58 (and the corresponding resume function) and I see that it's considerably worse when using LH_OP_SCOPED. It's always likely that I'm doing something wrong, but these are the times I'm getting for an N=1000000:

  • LH_OP_TAIL_NOOP: 0.017538s
  • LH_OP_SCOPED: 5.653231s
  • LH_OP_GENERAL: 0.745435s

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