Re: Newbie

[Paolo Bonzini <bonzini at gnu dot org>]

> > If it is possible, I would like to begin with a small project to get
> > familiar with GCC code. I have been through the "Simple GCC projects"
> > web page and I would be interested in project such as "Convert
> > reorg.c to use the flow graph".
> >
> > Could someone help me to get involved ?

I cannot but reinforce Laurynas' hints.  Unfortunately, you picked a 
rather complicated project, and I'm surprised that it is listed under 
"simple"!  In fact, it would probably be as easy to rewrite reorg.c 
completely; which is probably not the hardest GCC task on Earth, but not 
simple either.

You can look also at http://gcc.gnu.org/wiki/Speedup_areas including

* Bitmaps, also called sparse bit sets, are implemented using a linked 
list with a cache. This is probably not the most time-efficient 
representation, and it is not unusual for bitmap functions to show up 
high on the execution profile.  Try to understand which bitmaps can be 
replaced by ebitmaps.

* pointer_set and pointer_map are underused.

* Avoid recursive tree walks

* Rewrite for loops over the linked list of instructions (insns), so 
that they work on basic blocks and then on the insns for each basic block.

* cxx_binding should be 16 bytes, not 20.

Paolo