GCC parameter optimisation help

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I've observed that --param name=value type of options are
having default, min, max values but not all. eg. max-goto-duplication-insns
has default 8 but max-delay-slot-insn-search has none. My problem is:

1. Do all parameter have limits and defaults?
2. If yes why they are not documented?
3. If no how to find the best values?

Regard,
vikram

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