Optimisation options turned on at a certain level

[jgrant@reflectionsinteractive.com]

Hello,

I'm trying to find where in the gcc documentation the list of optimisations
that are implied by specifying -O3 and -Os with my gcc3.2 install.  I could
not find anything yet other than the following:

  -O[number]              Set optimisation level to [number]
  -Os                     Optimise for space rather than speed

from gcc -v --help

Could someone direct me to where I should be looking for this list of
optimisations that are turned on with the different levels please?

Kind regards

Jonathan