vikramsp <vikram2rhyme@xxxxxxxxx> writes: > 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? They all have defaults, of course. They do not all have limits. > 2. If yes why they are not documented? Either because the of a documentation bug or because the default is obvious. I agree that the default for max-delay-slot-insn-search should be documented. It is 100. > 3. If no how to find the best values? Start by looking at gcc/params.def. The --param options are generally intended for expert use by people familiar with how the compiler works. The -f options intended for use by people not deeply familiar with the compiler. This is not an excuse for poor documentations, but some of the --param options are quite difficult to document precisely. Ian
