Re: [PATCH] gcc-3.0.1 and 2.4.7-ac1

["Petr Vandrovec" <VANDROVE@vc.cvut.cz>]

On 27 Jul 01 at 18:03, Florian Weimer wrote:
> "Petr Vandrovec" <VANDROVE@vc.cvut.cz> writes:
> 
> > Just adding '-finline-limit=150' fixes all of them
> 
> This is not a fix, this is a workaround which is suitable for some
> specific GCC release(s).  The optimization decisions surrounding
> inlining are likely to change again, so this will break almost
> certainly in the future.

I found that main problem is in __constant_memcpy. This is very large
in internal representation (~70 'units'), so any kernel function which 
contains two memcpy calls with constant length cannot be inlined with 
current settings because of it contains 140+ internal operations - although
if compiler then generates static function (instead of inlined), it is ~10 
i386 operations long, from which 4 are push %edi/%esi and pop %esi/%edi...

                                            Best regards,
                                                    Petr Vandrovec
                                                    vandrove@vc.cvut.cz