GNU Optimizations important question

[Silverio Diquigiovanni]

Hi to all,
I need to know what optimization rules involve following options in the
gnu gcc 2.95.2 for SuperHitachi SH1/SH2:

    -O
    -O0
    -O1
    -O2
    -O3
    -O4
    -O5
    -O6
    -O7
    -O8
    -O9

    Example -O2 should be = -ffloat-store, -fno-default-inline, .......

Can someone help me ?

Thank you in advance
Best Regards,

Silverio Diquigiovanni