Any more explanation of opt_level?

In tvm.transform.Passcontext, one of parameters is opt_level, the explanation is " The optimization level of this pass.". Are there any more detail explanation of it? what is the difference between opt_level = 1 and opt_level = 2? what will happen while opt_level = 100?

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https://tvm.apache.org/docs/dev/pass_infra.html#passcontext