Re: What is exactly in O2?

[Phil Edwards <pedwards at disaster dot jaj dot com>]

On Wed, Jan 31, 2001 at 05:42:21PM -0500, Michael Meissner wrote:
> On Wed, Jan 31, 2001 at 05:33:42PM -0500, Phil Edwards wrote:
> > 
> > Somewhere I have a patch to allow a -print-flags switch to the compiler,
> > which will parse all the other command-line switches and then print the
> > flag_* variables which get changed.  It's useful for this kind of thing,
> > e.g., "-O2 -print-flags".  If you would this useful I'll mail it to you.
> 
> Even without -print-flags you can get this information via two methods:

Yup, that's why the patch was never checked in.  :-)  I still use it because
"-v -Q" contains lots of other verbiage.


> Note, the flags set by -O2 will change over time.

Wasn't there a push at one point to spread the optimizations out over a
slightly wider range than the current 1-3?  Like 1-5 or thereabouts?


Phil

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