From: Rask Ingemann Lambertsen <rask@sygehus.dk>
To: Michael Matz <matz@suse.de>
Cc: Jan Hubicka <jh@suse.cz>, gcc-patches@gcc.gnu.org
Subject: Re: Reduce startup cost of compiler (patch 2)
Date: Fri, 03 Aug 2007 12:43:00 -0000 [thread overview]
Message-ID: <20070803124303.GN25795@sygehus.dk> (raw)
In-Reply-To: <Pine.LNX.4.64.0708031408180.23011@wotan.suse.de>
On Fri, Aug 03, 2007 at 02:13:04PM +0200, Michael Matz wrote:
> OTOH if it was really only about optimization (i.e. choosing ALL_REGS is
> a bad decision) then adjusting the move cost was correct, but you didn't
> really have to use 65535 :-) It would have been enough to make the cost
> higher than for memory moves.
Yes, it's purely an optimization issue. There are no useable registers in
ALL_REGS that aren't in any other class also. ALL_REGS is simply a junk
class. I picked COSTS_N_INSNS (60000) to mean "disabled". That's now
COSTS_N_INSNS (16000) which seems to do the trick also. :-)
--
Rask Ingemann Lambertsen
prev parent reply other threads:[~2007-08-03 12:43 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
2007-08-03 12:13 ` Michael Matz
2007-08-03 12:43 ` Rask Ingemann Lambertsen [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070803124303.GN25795@sygehus.dk \
--to=rask@sygehus.dk \
--cc=gcc-patches@gcc.gnu.org \
--cc=jh@suse.cz \
--cc=matz@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).