From: Jim Wilson <wilson@specifixinc.com>
To: ml@bitbash.net
Cc: gcc@gcc.gnu.org
Subject: Re: latency in define_insn_reservation
Date: Wed, 10 Dec 2003 07:55:00 -0000 [thread overview]
Message-ID: <3FD6B7AA.4080308@specifixinc.com> (raw)
In-Reply-To: <20031209060818.26150.qmail@webmail-2-2.mesa1.secureserver.net>
ml@bitbash.net wrote:
> If instr I is issued cycle = t and the results are usable in cylce t+1, should the latency in define_insn_reservation be 1 or 0?
The latency should be 1. Try looking at existing dfa scheduler
descriptions. I doubt that you will find any that use a latency of
zero, but there are lots that use a latency of 1 for simple instructions
that you would expect to have single cycle latency.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
prev parent reply other threads:[~2003-12-10 6:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-09 6:06 ml
2003-12-10 7:55 ` Jim Wilson [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=3FD6B7AA.4080308@specifixinc.com \
--to=wilson@specifixinc.com \
--cc=gcc@gcc.gnu.org \
--cc=ml@bitbash.net \
/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).