[Bug middle-end/17549] [4.0 Regression] 15% increase in codesize with C code

[dberlin at dberlin dot org]

------- Additional Comments From dberlin at dberlin dot org  2004-10-18 14:06 -------
Subject: Re:  [4.0 Regression] 15% increase in codesize with C code


On Oct 18, 2004, at 9:55 AM, giovannibajo at libero dot it wrote:

>
> ------- Additional Comments From giovannibajo at libero dot it  
> 2004-10-18 13:55 -------
> Yes, also on x86, we save approx 2k:
>
> 21213    4.0.0 -Os
> 19158    4.0.0 -Os -fno-tree-pre
> 18466    4.0.0 -Os -fno-tree-pre -fno-ivopts
> 20172    4.0.0 -Os -fno-ivopts
> 17971    3.4.1 -Os
>
> Daniel?

Tree PRE (but not FRE)  should probably be disabled at -Os, since it 
will replicate code for speed reasons.
I'm happy to accept a patch to do this, it should be a  simple setting 
of flag_tree_pre to 0 when -Os is turned on.



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17549