From: David Edelsohn <dje@watson.ibm.com>
To: Alan Modra <amodra@bigpond.net.au>
Cc: gcc@gcc.gnu.org
Subject: Re: REQ_EQUAL and mems hoisted out of loops
Date: Tue, 25 Mar 2003 18:27:00 -0000 [thread overview]
Message-ID: <200303251813.NAA30690@makai.watson.ibm.com> (raw)
In-Reply-To: Message from Alan Modra <amodra@bigpond.net.au> of "Tue, 25 Mar 2003 22:42:16 +1030." <20030325121216.GL931@bubble.sa.bigpond.net.au>
>>>>> Alan Modra writes:
Alan> Oops, reg 145 has changed in the meantime at insn 41. From what I can
Alan> tell, the REG_EQUAL notes in combination with the fact that the store
Alan> to "y" has been moved out of the loop by loop optimization, is the cause
Alan> of cse confusion.
Alan> So it seems a possible fix would be to delete all REG_EQUAL notes
Alan> that mention any mem hoisted out of a loop. Before I try to do that,
Alan> I thought I'd solicit comments on the approach. Reasonable?
Sounds similar to a previous unroller bug I tracked down where a
REG_EQUAL note no longer was valid:
http://gcc.gnu.org/ml/gcc-patches/2002-10/msg00269.html
David
next prev parent reply other threads:[~2003-03-25 18:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-25 14:02 Alan Modra
2003-03-25 18:27 ` David Edelsohn [this message]
2003-03-26 10:36 ` Alan Modra
2003-03-26 17:26 ` Matt Kraai
2003-03-28 2:12 ` Richard Henderson
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=200303251813.NAA30690@makai.watson.ibm.com \
--to=dje@watson.ibm.com \
--cc=amodra@bigpond.net.au \
--cc=gcc@gcc.gnu.org \
/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).