[llvm-dev] Flags -O1 -O2 -O3

[David Fernandez via llvm-dev]

I've found that in 'opt' command, the list of transformation passes used for -O0,-O1,-O2 and -O3, is a reduced subset from the list of all the available passes available in 'opt' command. 

So, I have couple of questions regarding that:

- How is defined the subset of passes/flags used for -O0,-O1,-O2 and -O3
- And how to know which flags to discard from the whole list of passes available in 'opt' , as the flags of the family “X86” and more of this 

David
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