------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-23
01:53 -------
(In reply to comment #2)
> This is a tree-optimization bug for 4.0 and later. I think the problem
> is that we don't catch the store motion opportunity at the tree level
> because to the tree alias analyses arrays are opaque objects. On RTL
> we can distinguish the array members.
Then why don't we optimize in 3.4.0 while we did in 3.3.3.
> If this is the problem, then Dan's sa-branch work should fix it...
> Dan?
I already filed PR 19581 for that because on PPC even in 3.3.3 we don't get
optimial code. But
someone should look into what happened to changed the behavor in 3.4.0.
I am willing to bet it was the rewritten of the load/store monition.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|middle-end |rtl-optimization
Summary|[3.4/4.0 Regression] poor |[3.4/4.0 Regression] missed
|register allocation |load/store monition
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19580
