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[Bug middle-end/42973] [4.4/4.5 regression] IRA apparently systematically making reload too busy on 2 address instructions with 3 operands
- From: "vmakarov at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 Feb 2010 17:15:15 -0000
- Subject: [Bug middle-end/42973] [4.4/4.5 regression] IRA apparently systematically making reload too busy on 2 address instructions with 3 operands
- References: <bug-42973-176@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #11 from vmakarov at redhat dot com 2010-02-10 17:15 -------
(In reply to comment #8)
>
> Thanks, we should see if this solves the AMMP problem in a day or two.
> Are you going to look at the related PR42961? Without the regmove hunk
> it does not happen at AMMP but it likely happens elsewhere. I did some
> work on this years back on old RA so I can play with it too.
> (Simple fix would be to add ? penalizers to integer variant of FP moves,
> but I would like to see some solution where RA actually can use integers
> for mem->mem copies)
I am working on IRA without usage of cover classes. For example, IRA could
assign integer or floating point register for mem->mem copies whatever is
possible and whatever is more profitable. This code is big and not ready yet.
There are a lot of performance issues (besides IRA speed issues which is a
consequence of dealing with more classes). I am trying to solve the issues.
But if the code is ok, it probably will solve the problem.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42973