From: Rask Ingemann Lambertsen <rask@sygehus.dk>
To: Jan Hubicka <jh@suse.cz>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: Reduce startup cost of compiler (patch 2)
Date: Fri, 03 Aug 2007 09:16:00 -0000 [thread overview]
Message-ID: <20070803091636.GM25795@sygehus.dk> (raw)
In-Reply-To: <20070731154449.GA11467@kam.mff.cuni.cz>
On Tue, Jul 31, 2007 at 05:44:49PM +0200, Jan Hubicka wrote:
> Well, regclass is not able to work out all details (it always assumes
> worst case for union classes), but in your case it seems you got
> something wrong.
> ALL_REGS even if it contains hard regs such as stack pointers and
> virtual frame pointers, they are fixed and should not cause much harm to
> you. Can you send a bit more details how your classes/costs are set up?
The comment I have for REGISTER_MOVE_COST says: "Discourage regclass.c
from using ALL_REGS as alternate class." So the issue is not about ALL_REGS
as the preferred class but that regclass would choose e.g. GENERAL_REGS as
preferred class and ALL_REGS as alternate class where it should choose MEM
as alternate class.
--
Rask Ingemann Lambertsen
next prev parent reply other threads:[~2007-08-03 9:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 5:54 Jan Hubicka
2007-07-24 7:29 ` Richard Guenther
2007-07-24 7:52 ` Paolo Bonzini
2007-07-24 15:14 ` Jan Hubicka
2007-07-29 21:32 ` Rask Ingemann Lambertsen
2007-07-31 6:44 ` Jan Hubicka
2007-07-31 12:49 ` Rask Ingemann Lambertsen
2007-07-31 16:26 ` Jan Hubicka
2007-08-03 9:16 ` Rask Ingemann Lambertsen [this message]
2007-08-03 12:13 ` Michael Matz
2007-08-03 12:43 ` Rask Ingemann Lambertsen
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