massimiliano cialdi wrote:
> On Thu, Oct 9, 2008 at 10:57 AM, Andrew Haley <aph@xxxxxxxxxx> wrote:
>>> I need only stack usage optimization and NO code optimization (to let
>>> us easly debug the code), which parameters I need to use?
>> It's not possible.
> I try to relax my constraint.
> I need to reduce stack usage and keep the project debuggable (maybe
> with some code optimization)
> which set of parameters do I need to use.
> Last, only for curiosity, how can I reproduce exacly the behaviour of -O0?
By using -O0.
> as I said in previous mail I tried with
> -O1
> -fno-defer-pop
> -fno-delayed-branch
> -fno-guess-branch-probability
> -fno-cprop-registers
> -fno-if-conversion
> -fno-if-conversion2
> -fno-tree-ccp
> -fno-tree-dce
> -fno-tree-dominator-opts
> -fno-tree-dse
> -fno-tree-ter
> -fno-tree-lrs
> -fno-tree-sra
> -fno-tree-copyrename
> -fno-tree-fre
> -fno-tree-ch
> -fno-unit-at-a-time
> -fno-merge-constants
> -fno-ipa-pure-const
> -fno-ipa-reference
> -fno-omit-frame-pointer
> -fno-tree-copy-prop
> -fno-tree-salias
> -fno-tree-sink
> -fno-var-tracking
> -fno-caller-saves
>
> and I obtain a binary quite much optimized than which one optained
> only with -O0.
As I'd expect: optimization is enabled.
> So which parameter are missing from that list?
You seem to think it is possible to do that. I don't know why you
think such a thing. I don't think it is possible.
You seem to believe that there is some magic set of command line options
that will duplicate the various -O flags. There isn't.
There are lots of places in the compiler with things like
if (optimize > 0)
{
... do some optimization ...
}
Andrew.
