Re: Reduce complette unrolling & peeling limits

[Jan Hubicka <hubicka at ucw dot cz>]

> > > this patch reduces max-peeled-insns and max-completely-peeled-insns from 400
> > > to 100.  The reason why I am doing this is that I want to reduce code bloat
> > > caused by my cunroll work that enabled a lot more unrolling then previously
> > > causing considerable code size regression at -O3.
> > 
> > Did you notice that gcc.c-torture/compile/pr43186.c regressed?  It now again 
> > takes a while to compile, so times out on slow machines:
> 
> I did not :(.  I am currently on a trip, but will take a look on tuesday.
> If it seems to disturb testing, please just revert the patch for time being.

OK, here are multiple issues.
1) recursive inlining makes huge loop nest (of 18 loops)
2) SCEV is very slow on answering simple_iv tests in this case becuase it walks
   the nest
3) unroller is computing loop body size even when it is clear the body is much larger
   than the limit (the outer loop has 78000 instructions)

I will prepare patches to fix those issues. 

Honza
> 
> Honza